CN118713799A - Telemetry communication multi-cascade network collection and editing frame method and system - Google Patents

Abstract

The present invention provides a telemetry communication multi-cascade network collection and editing framing method and system, which respectively allocates node numbers to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and compiles a PCM mapping table based on the node number according to the preset non-electrical telemetry parameter source through a preset upper computer, so that the master stations in the primary ring network and the secondary ring network respectively receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all the telemetry data, and the telemetry data is matched with the PCM mapping table to complete the multi-cascade network framing. In this way, the entire framing process is unified and universal, and can be applied to any ring network in the industrial and aerospace fields that requires real-time parameter monitoring, and can achieve universalization, serialization and productization, and the data transmitted each time in the entire framing process is valid data, which greatly saves network bandwidth resources and improves network transmission efficiency.

Description

Telemetry communication multi-cascade network collection and editing frame method and system

Technical Field

The present invention relates to the field of telemetry communication technology, and more specifically to a telemetry data framing algorithm in aerospace, and more specifically to a telemetry communication multi-cascade network acquisition and framing method and system.

Background Art

In view of the current industrial and aerospace fields, more and more large aircraft need to monitor flight parameters in real time during flight. It is difficult for a single data collector to meet the needs of multi-cabin and multi-parameter collection tasks. Inside a large aircraft, due to the division of multiple cabins, multiple single machines are often required to be networked at multiple levels to form a complete multi-cascade collection system. However, at the current stage, the development of many data collectors is only designed for a specific model and specific function to design the system framing structure, which makes it difficult to achieve generalization, serialization and productization.

Therefore, there is an urgent need for a universal and configurable framing algorithm, a telemetry communication multi-cascade network framing method and system that can be universally used and flexibly adjusted and configured at any time.

Summary of the invention

In view of the above problems, the purpose of the present invention is to provide a telemetry communication multi-cascade network acquisition and editing framing method and system to solve the problem that at the current stage, many acquisition and editing devices are developed only to design the system framing structure for a specific model and specific function, which makes it difficult to achieve generalization, serialization and productization.

The present invention provides a telemetry communication multi-cascade network collection and editing framing method, which includes:

The network transmission equipment ring network between the network collector and the network converter in the telemetry communication is regarded as the primary ring network, and the network transmission equipment ring network between the network integrator and the network collector is regarded as the secondary ring network; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network;

According to the MAC address of each network device in the primary ring network and the secondary ring network, a node number is respectively assigned to each network device node;

A PCM mapping table is compiled by a preset host computer based on the node number according to a preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all telemetry data, and the telemetry data is matched with the PCM mapping table to complete the multi-cascade network framing.

Preferably, the process of compiling a PCM mapping table based on the node number according to a preset non-electric telemetry parameter source by a preset host computer so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table respectively, so that the network integrator dynamically receives all telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing includes: enabling the host computer to:

P (i, j, k) represents the source of the non-electrical telemetry parameter; wherein i represents that the non-electrical telemetry parameter is collected by the collector with node i in the primary ring network; j represents that the non-electrical telemetry parameter is collected by the converter with node j in the secondary ring network corresponding to the collector with node i; k represents that the non-electrical telemetry parameter is collected by the kth channel of the converter with node j;

All non-electric telemetry parameter sources are summarized and tabulated to form a PCM mapping table;

Referring to the PCM mapping table, forming a channel number full-frame mapping table, a converter full-frame mapping table and a collector full-frame mapping table according to different categories;

The channel number full-frame mapping table is sent to the network converter, so that the network converter receives the analog data sent by the sensor according to the channel number full-frame mapping table; the converter full-frame mapping table is sent to the network collector, so that the network collector receives the output data of the network converter according to the converter full-frame mapping table; the collector full-frame mapping table is sent to the network integrator, so that the network integrator receives the output data of the network collector according to the collector full-frame mapping table, and the network integrator maps and summarizes the received output data of the network collector based on the PCM mapping table to complete multi-cascade network framing.

Preferably, in the process of forming a channel number full frame mapping table, a converter full frame mapping table and a collector full frame mapping table according to different categories with reference to the PCM mapping table,

The host computer selects and classifies the tables corresponding to the same network collector and the same network converter in the PCM mapping table, so that each network converter is assigned a channel number full-frame mapping table; the channel number full-frame mapping table is distinguished by channel number, and the source of all non-electric telemetry parameters in a channel number full-frame mapping table is P (i, j, x); wherein i and j are the same, and x represents the channel number of different channels used by the same network converter to receive data;

The host computer selects and classifies the tables corresponding to the same network collector in the PCM mapping table, so that each network collector is assigned a converter full-frame mapping table; the converter full-frame mapping table is distinguished by the converter node number, and the source of all non-electric telemetry parameters in a converter full-frame mapping table is P (i, y, x); wherein i is the same, y represents the node number of different network converters connected to the same network collector; x represents the channel number corresponding to the data received by the network converter with the node number y;

The host computer selects and classifies the tables corresponding to the network integrators in the PCM mapping table, so that the collector full-frame mapping table allocated by the network integrator is classified according to the node number of the network collector; the source of all non-electrical telemetry parameters in the collector full-frame mapping table is P (z, y, x); wherein z represents the node number of different network collectors connected to the network integrator, y represents the node number of the network converter connected to the network collector with node number z; x represents the channel number corresponding to the data received by the network converter with node number y connected to the network collector with node number z.

Preferably, the process of sending the channel number full frame mapping table to the network converter so that the network converter receives the analog data sent by the sensor according to the channel number full frame mapping table includes:

Sending the channel number full frame mapping table to the network converter;

The network converter sends the analog data of the sensor corresponding to the channel with the number x to the FIFO buffer corresponding to the channel with the number x in the network converter based on the sampling rate set by the host computer and corresponding to the non-electric telemetry parameter source P (i, j, x) in the channel number full frame mapping table; wherein 12 FIFO buffers are initialized in the network converter according to the maximum number of channels;

Determine whether the FIFO buffer corresponding to the channel with the channel number x is not empty, and if not empty, write the analog data in the FIFO buffer corresponding to the channel with the channel number x into the data buffer in the network converter; wherein the data buffer is an A/B double buffer;

When the total analog data in the data buffer of the network converter reaches a complete channel number full-frame mapping table, the channel number full-frame mapping table framing data is formed and the channel number full-frame mapping table framing data is written to the preset converter sending buffer.

Preferably, the host computer sends the channel number full-frame mapping table to the network converter via the ring network bus; and the sampling rate set by the host computer for the network converter is the least common multiple of the sampling rates of each channel connected to the network converter.

Preferably, the process of sending the converter full frame mapping table to the network collector so that the network collector receives the output data of the network converter according to the converter full frame mapping table includes:

Sending the converter full frame mapping table to the network collector;

The network collector sends a data request instruction to the network converter with node number y based on the sampling rate set by the host computer and corresponds to the non-electric telemetry parameter source P (i, y, x) in the full-frame mapping table of the converter, so that the network converter with node number y transmits the channel number full-frame mapping table framing data in the converter sending buffer as the output data of the network converter back to the network collector;

The network collector writes the output data of the network converter y as data frames in order into the FIFO buffer corresponding to the network converter y in the network collector according to the node number y of the network converter; wherein the network collector is initialized with 64 FIFO buffers according to the maximum number of connected network converters;

Determine whether the FIFO buffer corresponding to the network converter y is not empty, and if not, write the data frame in the FIFO buffer corresponding to the network converter into the data buffer in the network collector; wherein the data buffer is an A/B double buffer;

When the total amount of data frames in the data buffer in the network collector reaches a complete switch full frame mapping table, the switch full frame mapping table framing data is formed and written into the preset collector sending buffer.

Preferably, when the converter full frame mapping table is sent to the network collector,

The host computer stores the bound converter full frame mapping table in the non-volatile flash memory of the network collector, and after the network collector is powered on and initialized, the converter full frame mapping table is stored in the data buffer of the network collector.

Preferably, the collector full frame mapping table is sent to the network integrator, so that the network integrator receives the output data of the network collector according to the collector full frame mapping table, and the network integrator maps and summarizes the received output data of the network collector based on the PCM mapping table to complete the process of multi-cascade network framing, including:

Sending the collector full frame mapping table to the network integrator according to a preset maximum sampling rate;

Adding the mapping relationship between telemetry parameters, parallel delay data and storage retransmission data in the collector full frame mapping table to form a PCM full frame mapping table;

The network integrator sends a data request instruction to the network collector with node number z based on the sampling rate set by the host computer and corresponds to the non-electric telemetry parameter source P (z, y, x) in the PCM full frame, so that the network collector with node number z transmits the switch full frame mapping table framing data in the collector sending buffer as the output data of the network collector back to the network integrator;

The network integrator writes the output data of the network collector z as data frames in order into the FIFO buffer corresponding to the network collector z in the network integrator according to the node number z of the network collector; wherein the network integrator is initialized with 16 FIFO buffers according to the maximum number of connected network collectors;

Determine whether the FIFO buffer corresponding to the network collector z is not empty, if not empty, write the data frame in the FIFO buffer corresponding to the network collector into the data buffer in the network integrator; wherein the data buffer is an A/B double buffer;

When the total amount of data frames in the data buffer in the network integrator reaches a complete PCM full-frame mapping table, full-frame mapping table framing data is formed and sent to a preset PCM framing module to complete multi-cascade network framing.

Preferably, while receiving the output data of the network collector according to the collector full frame mapping table, the network integrator further comprises:

Receive the binding instruction about the PCM mapping table sent by the host computer, and feed back the status information of each submodule in the network collector, the network converter and the network integrator to the host computer.

The present invention also provides a telemetry communication multi-cascade network collection and editing framing system, which implements the telemetry communication multi-cascade network collection and editing framing method as described above, including:

A primary ring network composed of a network collector and a network converter in telemetry communication, and a secondary ring network composed of a network integrator and the network collector; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network;

The host computer is used to assign node numbers to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and compile a PCM mapping table based on the node number according to a preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all the telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing.

It can be seen from the above technical scheme that the telemetry communication multi-cascade network collection and editing framing method and system provided by the present invention regards the network transmission equipment ring network between the network collector and the network converter in the telemetry communication as the primary ring network, and regards the network transmission equipment ring network between the network integrator and the network collector as the secondary ring network; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network, and then the node number is assigned to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and through the preset The upper computer compiles a PCM mapping table based on the node number according to the preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing. In this way, the entire framing process is unified and universal, and can be applied to any ring network in the industrial and aerospace fields that requires real-time monitoring of parameters, and can achieve generalization, serialization and productization. In addition, the data transmitted each time during the entire framing process is valid data, which greatly saves network bandwidth resources and improves network transmission efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

1 is a flow chart of a telemetry communication multi-cascade network collection and editing framing method according to an embodiment of the present invention;

2 is a schematic diagram of a network transmission device ring network involved in a telemetry communication multi-cascade network collection and editing framing method according to an embodiment of the present invention;

3 is a schematic diagram of a framing process of a network converter according to a channel number full frame mapping table in a telemetry communication multi-cascade network collection and editing framing method according to an embodiment of the present invention;

4 is a schematic diagram of a framing process of a network collector according to a full frame mapping table of a switch in a telemetry communication multi-cascade network framing method according to an embodiment of the present invention;

5 is a schematic diagram of a framing process of a network integrator according to a full-frame mapping table of a collector in a telemetry communication multi-cascade network collection and editing framing method according to an embodiment of the present invention;

FIG6 is a system block diagram of a telemetry communication multi-cascade network collection and editing framing system according to an embodiment of the present invention.

DETAILED DESCRIPTION

More and more large aircraft need to monitor flight parameters in real time during flight. It is difficult for a single data acquisition device to meet the needs of multi-cabin and multi-parameter data acquisition tasks. Inside a large aircraft, due to the division of multiple cabins, multiple single machines are often required to be networked at multiple levels to form a complete multi-cascade data acquisition system. However, at the current stage, the development of many data acquisition devices is only designed for a specific model and specific function to design the system framing structure, which makes it difficult to achieve universalization, serialization and productization.

In view of the above problems, the present invention provides a telemetry communication multi-cascade network data acquisition and editing framing method and system. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to illustrate the telemetry communication multi-cascade network data acquisition and editing framing method and system provided by the present invention, Figures 1 to 6 provide exemplary illustrations of the embodiments of the present invention.

The following description of exemplary embodiments is merely illustrative in nature and is not intended to limit the present invention and its application or use. Technologies and devices known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technologies and devices should be considered as part of the specification.

As shown in FIG1 , the present invention provides a telemetry communication multi-cascade network collection and editing framing method, comprising:

S1: The network transmission equipment ring network between the network collector and the network converter in the telemetry communication is used as the primary ring network, and the network transmission equipment ring network between the network integrator and the network collector is used as the secondary ring network; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network;

S2: assigning node numbers to the nodes of the network devices according to the MAC addresses of the network devices in the primary ring network and the secondary ring network

S3: A PCM mapping table is compiled by a preset host computer based on the node number according to a preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all telemetry data, and matches the telemetry data with the PCM mapping table to complete the multi-cascade network framing.

In the embodiment shown in FIG. 1 and FIG. 2 , step S1 is a process of using the network transmission equipment ring network between the network collector and the network converter in the telemetry communication as a primary ring network, and using the network transmission equipment ring network between the network integrator and the network collector as a secondary ring network, wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network;

In this embodiment, the network converter is connected to sensors for sensing first-line data through multiple channels, thereby forming a complete loop of data collection, transmission, and framing.

In this embodiment, step S2 is a process of respectively allocating a node number to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network.

Specifically, each node in the network transmission equipment ring network (a general term for primary ring networks and secondary ring networks) has its own MAC address and node number. Different node numbers are assigned according to the different MAC addresses of each node (a single network integrator, network collector, network converter), and the nodes are distinguished by the node numbers. Therefore, in order to ensure the uniformity of the program versions of each collector and converter, the network collector (also known as: collector) and network converter (also known as: converter) have independent hardware parameter binding interfaces. Through the parameter binding interface, each collector and converter needs to be individually bound with the node number and mac address. Each collector program uses the same default initial MAC address and node number. The node number is completed in advance by the preset parameter binding software. When binding the node number, first connect the separate network collector and converter through the initial mac address and node number, bind the separate mac address and ID node number to each collector and converter, and the collector and converter write the bound mac address and ID node number into the eeprom. After restarting and powering on, read the current mac address and ID node number from the eeprom. The subsequent host computer directly executes the MAC and ID node number bound in the eeprom during related work and subsequent specific border town processes, that is, the node number used in 1 framing is the ID node number set now. Each node has a unique ID node number that can identify its own node. The converter and collector have their own ID node number, and different ID node numbers need to be bound in advance through the parameter binding function. The subsequent network integrator needs to allocate the corresponding FIFO buffer according to the ID node number of the collector to store the data sent from the network collector with the corresponding ID node number to the network integrator. And in this embodiment, the parameters in the eeprom are read by default when powered on. If the data in the eeprom are all F, it is determined that the node to which the eeprom belongs has not yet been bound with an ID node number (node number), and the program sets the network port according to the default mac and ID number.

In the embodiment shown in Figures 1 to 5, step S3 is to compile a PCM mapping table based on the node number according to a preset non-electrical telemetry parameter source by a preset host computer, so that the master stations in the primary ring network and the secondary ring network respectively receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing process.

Among them, step S3 compiles a PCM mapping table based on the node number according to the preset non-electric telemetry parameter source by a preset host computer, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing process, including: enabling the host computer:

S31: P (i, j, k) represents the source of the non-electrical telemetry parameter; wherein i represents that the non-electrical telemetry parameter is collected by the collector with node i in the primary ring network; j represents that the non-electrical telemetry parameter is collected by the converter with node j in the secondary ring network corresponding to the collector with node i; k represents that the non-electrical telemetry parameter is collected by the kth channel of the converter with node j;

S32: Summarize and tabulate all non-electric telemetry parameter sources to form a PCM mapping table;

S33: referring to the PCM mapping table and dividing it into different categories to form a channel number full frame mapping table, a converter full frame mapping table and a collector full frame mapping table;

S34: sending the channel number full frame mapping table to the network converter, so that the network converter receives the analog data sent by the sensor according to the channel number full frame mapping table; sending the converter full frame mapping table to the network collector, so that the network collector receives the output data of the network converter according to the converter full frame mapping table; sending the collector full frame mapping table to the network integrator, so that the network integrator receives the output data of the network collector according to the collector full frame mapping table;

S35: The network integrator maps and aggregates the received output data of the network collector based on the PCM mapping table to complete multi-cascade network framing.

In step S33, in the process of forming a channel number full frame mapping table, a converter full frame mapping table and a collector full frame mapping table according to different categories by referring to the PCM mapping table,

The host computer selects and classifies the tables corresponding to the same network collector and the same network converter in the PCM mapping table, so that each network converter is assigned a channel number full-frame mapping table; the channel number full-frame mapping table is distinguished by channel number, and the source of all non-electric telemetry parameters in a channel number full-frame mapping table is P (i, j, x); wherein i and j are the same, and x represents the channel number of different channels used by the same network converter to receive data;

The host computer selects and classifies the tables corresponding to the same network collector in the PCM mapping table, so that each network collector is assigned a converter full-frame mapping table; the converter full-frame mapping table is distinguished by the converter node number, and the source of all non-electric telemetry parameters in a converter full-frame mapping table is P (i, y, x); wherein i is the same, y represents the node number of different network converters connected to the same network collector; x represents the channel number corresponding to the data received by the network converter with the node number y;

The host computer selects and classifies the tables corresponding to the network integrators in the PCM mapping table, so that the collector full-frame mapping table allocated by the network integrator is classified according to the node number of the network collector; the source of all non-electrical telemetry parameters in the collector full-frame mapping table is P (z, y, x); wherein z represents the node number of different network collectors connected to the network integrator, y represents the node number of the network converter connected to the network collector with node number z; x represents the channel number corresponding to the data received by the network converter with node number y connected to the network collector with node number z.

That is, the non-electrical telemetry parameters in the telemetry system are represented by P(i, j, k) (i/j/k is just an identification to illustrate the source of the parameters, just to facilitate our interpretation of the source of the data in the PCM mapping table. The data mapping table sent by the upper computer must identify the source address of the current parameter: which collector, which converter, which channel), where i indicates that the parameter is collected by the collector numbered i in the primary ring network, j indicates that the parameter is collected by the converter numbered j in the secondary ring network corresponding to the collector numbered i, and k indicates the kth collection channel of the converter numbered j.

That is, after the host computer sets the PCM frame structure, a total PCM mapping table is formed, and then selected according to certain rules to form a channel number full frame mapping table, a converter full frame mapping table and a collector full frame mapping table, which are respectively sent to the network converter, the network collector and the network integrator. The nodes of each primary ring network and the secondary ring network frame the collected data according to the corresponding table set by the host computer, and the framed data is stored in the sending buffer, waiting for the master station to send a request command, and sent to the master station. After the master station receives the data, it stores the fifo buffer for system PCM framing; the specific rules are selected according to the embodiment of the above step S33. In short, according to P (i, j, k), the same i and j are selected to form a different k as the channel number full frame mapping table; the same i with different j, k is not limited, as the converter full frame mapping table; the different i, j and k are not limited as the collector full frame mapping table. In this way, it is convenient to unify the framing management, and it can be manually controlled through the host computer operation. The uniformity is strong while the reliability and flexibility are also strong.

Wherein, step S34 includes: S34A: sending the channel number full frame mapping table to the network converter so that the network converter receives the analog data sent by the sensor according to the channel number full frame mapping table, including:

SA1: Send the channel number full frame mapping table to the network converter;

SA2: The network converter sends the analog data of the sensor corresponding to the channel with the number x to the FIFO buffer corresponding to the channel with the number x in the network converter based on the sampling rate set by the host computer and the non-electric telemetry parameter source P (i, j, x) in the channel number full frame mapping table; wherein 12 FIFO buffers are initialized in the network converter according to the maximum number of channels;

SA3: Determine whether the FIFO buffer corresponding to the channel with the channel number x is not empty. If it is not empty, write the analog data in the FIFO buffer corresponding to the channel with the channel number x into the data buffer in the network converter; wherein the data buffer is an A/B double buffer;

SA4: When the total analog data in the data buffer of the network converter reaches a complete channel number full-frame mapping table, the channel number full-frame mapping table framing data is formed, and the channel number full-frame mapping table framing data is written to the preset converter sending buffer.

The host computer sends the channel number full-frame mapping table to the network converter via the ring network bus; and the sampling rate set by the host computer for the network converter is the least common multiple of the sampling rates of each channel connected to the network converter.

Specifically, the network converter, as a slave node of the primary ring network, is responsible for collecting the original signals of each sensor, converting the original signals into standard hexadecimal data according to the parameters bound by the host computer, forming a valid data frame according to the PCM mapping table bound by the host computer, and storing it in the buffer waiting to be sent to the collector master station. Considering that in the FPGA logic code, the number and length of the FIFO buffer corresponding to each collector can only be set by writing a program, and the establishment and cancellation of FIFO cannot be achieved by parameter binding, it is necessary to open a FIFO buffer in the collector according to the maximum number of converters in the primary ring network. Each collector opens 64 FIFOs with a depth of 1024*16bit. Each FIFO corresponds to the data of a converter. By sending to each converter, the converter returns to the collector, and the collector stores the data in each converter into the corresponding fifo buffer. The full telemetry frame format is shown in the following table, and each parameter is represented by P(i,j,k). i represents the node number of the secondary ring network collector (0-15), j represents the node number of the primary ring network converter (0-63), and k represents the converter channel number (0-12, three conditioning modules, each with a maximum of four channels).

The obtained channel number full frame mapping table is shown in Figure 3 and the following table:

That is, the PCM mapping table configured by the host computer is in the telemetry full-frame format. The host computer needs to classify the data in different converters in the PCM mapping table format, that is, divide it into the data of a single converter, and send the data mapping table of a single converter to each specific converter respectively. At the same time, the data mapping table of the converter is arranged in the order of the sub-frame and the full-frame to form a channel number full-frame mapping table. The converter writes into the mapping buffer at a specific sampling rate in the order of the arrangement of the channel number full-frame mapping table bound by the host computer. After the complete frame data is written, it is uniformly written into the send buffer.

The above is a data table of channels 1-12 in the converter with node number 1 in the collector ring network with node number 1 selected from the full frame. They are arranged in the order in the PCM full frame. The host computer needs to select from the full frame PCM full frame to form a mapping table for a separate converter, which is sent to each converter through the ring network bus. The sent protocol is shown in the following table. The PCM full frame mapping table of each converter is set by the following protocol, and the current converter data frame length can be determined. The data frame length is written into the converter flash memory through parameter binding. Each transmitted data is valid data, which greatly saves network bandwidth resources and improves network transmission efficiency.

More specifically, in a specific embodiment, 12 FIFO buffers are initialized in the network converter program (FPGA) according to the maximum number of channels, and the host computer sends it to the converter according to the maximum sampling rate (the maximum sampling rate value among all channels of a single converter), and the converter sets all channels to collect analog data at the maximum sampling rate; the host computer sets the sampling rate of each channel respectively (related to the number of data repetitions in the full-frame PCM structure), and the FPGA logic in the converter sends the data collected by the corresponding channel to the FIFO buffer of the corresponding channel according to the sampling rate set by the host computer. According to the information of the converter data mapping table, when it is determined that the corresponding channel FIFO (FIFO buffer) is not empty, the data in the current fifo can be read and written into the data buffer. When the written buffer data reaches the length of a complete mapping table, the entire buffer data can be written into the sending buffer. The specific logical relationship is shown in the figure below. Two data buffers A/B are opened inside the network converter. When waiting for the current cycle to arrive, the data in data buffer B is directly stored in the sending buffer. The data is the data collected in the previous cycle. In this cycle, the collected data is stored in data buffer A, waiting for the next cycle to be stored in the sending buffer. Data buffer A and data buffer B perform ping-pong operation, so the sending of data collected inside the converter will be delayed by one cycle.

The host computer uses the greatest common multiple of the sampling rates of all channels in a single converter channel as the sampling rate of each channel of the converter. The host computer sets the sampling rate of each channel according to the number of repetitions of the data of each channel of a single converter in the PCM full frame. The sampling rate is required to be a common multiple of the sampling rates of all channels, that is, the value of each sampling is guaranteed not to be repeated. The sampled channel data is directly stored in the fifo buffer of the corresponding channel. When the framing code logic determines that the FIFO is not empty, the data in the FIFO can be read and written into the data buffer according to the converter full frame mapping table. When the data written into the buffer reaches the number of data in the converter full frame mapping table, it indicates that the current framing is completed, and the converter full frame data in the data buffer is written into the data buffer, and the flexible configuration of the current converter PCM frame can be completed.

As shown in FIG4 , step S34 includes: S34B: sending the converter full frame mapping table to the network collector so that the network collector receives the output data of the network converter according to the converter full frame mapping table, including:

SB1: Sending the converter full frame mapping table to the network collector;

SB2: The network collector sends a data request instruction to the network converter with node number y based on the sampling rate set by the host computer and corresponds to the non-electric telemetry parameter source P (i, y, x) in the full-frame mapping table of the converter, so that the network converter with node number y transmits the channel number full-frame mapping table framing data in the converter sending buffer as the output data of the network converter back to the network collector;

SB3: The network collector writes the output data of the network converter y as data frames in order into the FIFO buffer corresponding to the network converter y in the network collector according to the node number y of the network converter; wherein the network collector is initialized with 64 FIFO buffers according to the maximum number of connected network converters;

SB4: Determine whether the FIFO buffer corresponding to the network converter y is not empty. If it is not empty, write the data frame in the FIFO buffer corresponding to the network converter to the data buffer in the network collector; wherein the data buffer is an A/B double buffer;

SB5: When the total amount of data frames in the data buffer in the network collector reaches a complete switch full frame mapping table, the switch full frame mapping table framing data is formed and the switch full frame mapping table framing data is written into the preset collector sending buffer.

When the converter full frame mapping table is sent to the network collector,

The host computer stores the bound converter full frame mapping table in the non-volatile flash memory of the network collector, and after the network collector is powered on and initialized, the converter full frame mapping table is stored in the data buffer of the network collector.

Specifically, the network collector, as the master station of the primary ring network, needs to read back the data of each converter in the current ring network within one cycle. Each converter forms a data frame according to the data mapping table and parameter information bound by the host computer, and transmits it back to the network collector master station. After receiving the data frame, the master station needs to put the data of each converter into the FIFO corresponding to the network collector. Each network collector can connect up to 64 network converters, so it is necessary to initialize 64 FIFO buffers in the network collector program, and store the converter data frame in the corresponding FIFO buffer according to the received converter node number. The host computer binds the data frame mapping table for the current network collector, and stores the network collector data frame mapping table in the non-volatile flash memory. After power-on initialization, the data frame is read from the flash and placed in the data buffer.

As the intermediate node between the primary ring network and the secondary ring network, the network collector is both the master station of the primary ring network converter and the slave station of the secondary ring network integrator. The network collector master station and the network collector slave station exist in the network collector program code in the form of two different IP cores, and a network collector master station buffer and a network collector slave station buffer are opened inside the network collector, respectively, with a network collector slave station send data cache and a network collector master station receive data cache.

The network collector reads the data in 64 FIFOs according to the data frame mapping table bound by the host computer and fills them into the data frame format. In each cycle, it determines whether the FIFO is not empty to read the data value in the FIFO and fill it into the data frame structure buffer of the network collector. When a completed data frame is formed, the current data frame is stored in the sending buffer and sent to the network integrator. The specific process is shown in the figure below. The network collector uses A/B double buffer to complete the data cache. Assume that the data sent to the network collector slave station sending buffer in the current cycle comes from data buffer B, and the data in data buffer B is the data of all converters of the current primary ring network collected by the network collector in the last cycle. When the current cycle command arrives, the data in data buffer B is directly sent to the network collector slave station sending buffer. In the current cycle, the data in the network collector master station receiving buffer is read out and stored in the corresponding FIFO buffer, and the data in the FIFO is read out and stored in data buffer A according to the mapping table, waiting for the next cycle to start and write the data in data buffer A into the network collector slave station sending buffer. Data buffer A and data buffer B complete data transmission through ping-pong operation, so the internal data transmission of the network collector will be delayed by one cycle.

To complete the mapping of the collector PCM frame, the host computer needs to select the data of all converters in the same collector one by one according to the arrangement order in the full frame according to the PCM mapping table, and form a full-frame mapping table of the switch for a separate collector. The full-frame mapping table of the switch is as follows:

The above is the data mapping table of nodes 1-64 in the ring network of the collector with node number 1 selected from the PCM mapping table. Arranged in the order in the PCM mapping table, the host computer needs to select from the PCM mapping table to form a mapping table for a separate collector, and send it to each collector through the ring network bus. Thus, the PCM full-frame mapping table belonging to each collector, that is, the switch full-frame mapping table, is set up, the current collector data frame length can be determined, and the data frame length is written into the collector flash memory through parameter binding. The data transmitted by the collector each time is valid data, which greatly saves the collector network bandwidth resources and improves network transmission efficiency.

As shown in FIG5 , step S34 also includes: S34C: sending the collector full frame mapping table to the network integrator, so that the network integrator receives the output data of the network collector according to the collector full frame mapping table, and the network integrator maps and summarizes the received output data of the network collector based on the PCM mapping table to complete the multi-cascade network framing process, including:

SC1: sending the full frame mapping table of the collector to the network integrator according to the preset maximum sampling rate;

SC2: Adding the mapping relationship between telemetry parameters, parallel delay data and storage retransmission data in the collector full frame mapping table to form a PCM full frame mapping table;

SC3: The network integrator sends a data request instruction to the network collector with node number z based on the sampling rate set by the host computer and corresponding to the non-electric telemetry parameter source P (z, y, x) in the PCM full frame, so that the network collector with node number z transmits the switch full frame mapping table framing data in the collector sending buffer as the output data of the network collector back to the network integrator;

SC4: The network integrator writes the output data of the network collector z as data frames in order into the FIFO buffer corresponding to the network collector z in the network integrator according to the node number z of the network collector; wherein the network integrator is initialized with 16 FIFO buffers according to the maximum number of connected network collectors;

SC5: Determine whether the FIFO buffer corresponding to the network collector z is not empty. If it is not empty, write the data frame in the FIFO buffer corresponding to the network collector into the data buffer in the network integrator; wherein the data buffer is an A/B double buffer;

SC6: When the total amount of data frames in the data buffer in the network integrator reaches a complete PCM full-frame mapping table, full-frame mapping table framing data is formed, and the full-frame mapping table framing data is sent to the preset PCM framing module to complete the network framing.

The network integrator, while receiving the output data of the network collector according to the collector full frame mapping table, also includes:

Receive the binding instruction about the PCM mapping table sent by the host computer, and feed back the status information of each submodule in the network collector, network converter and network integrator to the host computer.

As the master station of the secondary ring network and the integrated terminal of the ring network system, the network integrator, on the one hand, receives parameter binding instructions from the host computer and feeds back the status information of each module to the host computer; on the other hand, it needs to aggregate the data of all collectors and output them to the PCM framing module in the format of the PCM full frame mapping table, thereby outputting the PCM data stream information.

The host computer needs to classify the collectors according to the ID number based on the PCM mapping table. There is no need to distinguish the converter type and ID number (this part of the mapping relationship has been represented in the collector and the converter). The secondary ring network of the network integrator supports up to 16 collectors, so 16 FIFO buffers are allocated in the network integrator logic code. After each cycle, the network integrator reads the data in the corresponding collector FIFO according to the bound PCM frame mapping table, and fills the read data into the network integrator PCM framing buffer. The mapping table in the network integrator only indicates which collector the current data comes from. According to the following mapping table, the data is read from the FIFO buffer of the corresponding collector and filled into the data buffer, and sent to the PCM framing module. The full frame mapping table of the collector is shown in the following table:

As shown in the table above, during the PCM framing process, the network integrator not only considers the data of the collector, but also needs to reflect the mapping relationship between telemetry parameters, parallel delay data, and storage retransmission data to the PCM full frame mapping table. The network integrator reads the PCM full frame mapping table and reads the data in the corresponding collector FIFO through the full frame mapping table. The data in the collector FIFO has been arranged in the PCM full frame sequence through the network converter mapping and the network collector mapping. Therefore, the read FIFO data can be directly placed in the network integrator full frame data buffer and sent to the PCM framing module.

As shown in Figure 5, the network synthesizer adopts a single buffer mechanism. Since the transmission speed of the PCM data stream is significantly lower than the cycle data acquisition speed, the data in the FIFO corresponding to the collector is directly written into the PCM FIFO buffer according to the mapping table. The PCM data transmission module can directly read data from the PCM FIFO buffer and output the PCM data stream information according to the PCM data transmission timing. The host computer configures the network synthesizer data frame mapping information to distinguish the collector ID number, parallel delay, storage retransmission, and telemetry parameters. Therefore, three byte mapping tables are required to map the data of the corresponding channels. The mapping tables are listed separately, so that the framing is more complete and detailed, which is conducive to the later control and improves the flexibility of framing.

Based on the above embodiments, the telemetry communication multi-cascade network collection and editing framing method provided by the present invention takes the network transmission equipment ring network between the network collector and the network converter in the telemetry communication as the primary ring network, and takes the network transmission equipment ring network between the network integrator and the network collector as the secondary ring network; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network, and then assigns a node number to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and through a preset upper computer A PCM mapping table is compiled based on the node number according to the preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all the telemetry data, and the telemetry data is matched with the PCM mapping table to complete the multi-cascade network framing. In this way, the entire framing process is unified and universal, and can be applied to any ring network in the industrial and aerospace fields that requires real-time monitoring of parameters, and can achieve universalization, serialization and productization. In addition, the data transmitted each time during the entire framing process is valid data, which greatly saves network bandwidth resources and improves network transmission efficiency.

As shown in FIG6 , the present invention further provides a telemetry communication multi-cascade network collection and editing framing system, which implements the telemetry communication multi-cascade network collection and editing framing method as described above, including:

A primary ring network 101 composed of a network collector and a network converter in telemetry communication, and a secondary ring network 102 composed of a network integrator and the network collector; wherein the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network;

The host computer 103 is used to assign node numbers to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and compile a PCM mapping table based on the node number according to a preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all the telemetry data, and corresponds the telemetry data to the PCM mapping table to complete the multi-cascade network framing.

The specific implementation method refers to the above-mentioned embodiment of the telemetry communication multi-cascade network data acquisition and editing framing method, which will not be described in detail here.

As described above, the telemetry communication multi-cascade network collection and editing frame system provided by the present invention uses the network transmission equipment ring network between the network collector and the network converter in the telemetry communication as the primary ring network 101, and uses the network transmission equipment ring network between the network integrator and the network collector as the secondary ring network 102; wherein, the network collector is the master station of the primary ring network, and the network converter is the slave station of the primary ring network; the network collector is also the slave station of the secondary ring network, and the network integrator is the master station of the secondary ring network, and then the node number is respectively assigned to each network device node according to the MAC address of each network device in the primary ring network and the secondary ring network, and the node number is ... 103 compiles a PCM mapping table based on the node number according to the preset non-electrical telemetry parameter source, so that the master stations in the primary ring network and the secondary ring network receive the telemetry data in their respective slave stations according to the PCM mapping table, so that the network integrator dynamically receives all the telemetry data, and corresponds the telemetry data with the PCM mapping table to complete the multi-cascade network framing. In this way, the entire framing process is unified and universal, and can be applied to any ring network in the industrial and aerospace fields that requires real-time parameter monitoring, and can achieve universalization, serialization and productization. In addition, the data transmitted each time during the entire framing process is valid data, which greatly saves network bandwidth resources and improves network transmission efficiency.

As described above with reference to the accompanying drawings, the telemetry communication multi-cascade network collection and editing framing method and system proposed in the present invention are described by way of example. However, those skilled in the art should understand that various improvements can be made to the telemetry communication multi-cascade network collection and editing framing method and system proposed in the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims (10)

1. A method for framing a telemetry communication multi-tandem network, comprising:

Taking a network transmission equipment ring network between a network collector and a network converter in telemetry communication as a primary ring network, and taking the network transmission equipment ring network between a network synthesizer and the network collector as a secondary ring network; the network collector is a master station of the primary ring network, and the network converter is a slave station of the primary ring network; the network collector is a secondary station of the secondary ring network at the same time, and the network synthesizer is a primary station of the secondary ring network;

Node numbers are respectively distributed to the network equipment nodes according to the MAC addresses of the network equipment in the primary ring network and the secondary ring network;

And compiling a PCM mapping table by a preset upper computer based on the node number according to a preset non-electric quantity telemetry parameter source, enabling a primary station in the primary ring network and a secondary ring network to respectively receive telemetry data in each secondary station according to the PCM mapping table, enabling the network synthesizer to dynamically receive all telemetry data, and enabling the telemetry data to correspond to the PCM mapping table so as to complete multi-cascade network framing.

2. The method for framing a telemetry communication multi-tandem network as recited in claim 1, wherein a PCM mapping table is compiled by a preset upper computer according to a preset non-electric telemetry parameter source based on the node number, so that a master station in the primary ring network and a master station in the secondary ring network respectively receive telemetry data in each slave station according to the PCM mapping table, so that the network synthesizer dynamically receives all telemetry data, and the telemetry data corresponds to the PCM mapping table to complete multi-tandem network framing, comprising: causing the host computer to:

Representing the source of the non-electrical telemetry parameters by P (i, j, k); wherein i represents that the non-electric quantity telemetry parameter is acquired by an acquisition device with a node i in the primary ring network; j represents that the non-electric quantity telemetry parameter is acquired by a transducer with a node number j in the secondary ring network corresponding to the collector with the node number i; k represents the kth acquisition channel of the converter with the node number j of the non-electric quantity telemetry parameter;

summarizing and tabulating all non-electric quantity telemetry parameter sources to form a PCM mapping table;

Dividing the PCM mapping table according to different categories to form a channel number full-frame mapping table, a converter full-frame mapping table and a collector full-frame mapping table;

Transmitting the channel number full-frame mapping table to the network converter so that the network converter receives analog quantity data transmitted by a sensor according to the channel number full-frame mapping table; the converter full-frame mapping table is sent to the network collector, so that the network collector receives output data of the network converter according to the converter full-frame mapping table; and sending the collector full-frame mapping table to the network synthesizer, so that the network synthesizer receives the output data of the network collector according to the collector full-frame mapping table, and maps and summarizes the received output data of the network collector based on the PCM mapping table to complete multi-cascade network framing.

3. The method of framing a telemetry communication multi-tandem network of claim 2, wherein in the process of dividing the channel number full-frame map, the converter full-frame map and the collector full-frame map by different categories with reference to the PCM map,

The upper computer selects and classifies tables corresponding to the same network collector and the same network converter in the PCM mapping table, so that each network converter is distributed with a channel number full-frame mapping table; the channel number full-frame mapping tables are distinguished by the channel number, and all non-electric quantity telemetry parameter sources in one channel number full-frame mapping table are P (i, j, x); wherein i and j are the same, x represents the channel number of different channels used by the data received by the same network transformer;

the upper computer selects and classifies tables corresponding to the same network collector in the PCM mapping table, so that each network collector is distributed with a converter full-frame mapping table; the converter full-frame mapping tables are distinguished by converter node numbers, and all non-electric quantity telemetry parameter sources in one converter full-frame mapping table are P (i, y, x); wherein i is the same, y represents the node number of different network converters connected by the same network collector in a network manner; x represents the channel number corresponding to the data received by the network converter with the node number of y;

The upper computer selects and classifies tables corresponding to the network synthesizer in the PCM mapping table, so that the collector full-frame mapping table distributed by the network synthesizer is classified by the node number of the network collector; all non-electric quantity telemetry parameter sources in the collector full-frame mapping table are P (z, y, x); wherein z represents the node number of different network collectors connected by the network synthesizer in a network manner, and y represents the node number of a network converter connected by the network collector with the node number z in a network manner; x represents the channel number corresponding to the received data of the network converter with the node number y connected with the network collector with the node number z.

4. The telemetry communication multi-tandem network framing method of claim 3, wherein the process of transmitting the channel number full-frame map to the network transformer to cause the network transformer to receive analog data transmitted by a sensor according to the channel number full-frame map comprises:

transmitting the channel number full-frame mapping table to the network converter;

The network converter sends analog quantity data of a sensor corresponding to a channel with the channel number of x to a FIF0 buffer zone corresponding to the channel with the channel number of x in the network converter based on the sampling rate set by the upper computer and corresponding to a non-electric quantity telemetry parameter source P (i, j, x) in the channel number full-frame mapping table; wherein, the network converter is initialized with 12 FIF0 buffer areas according to the maximum channel number;

Judging whether the FIF0 buffer area corresponding to the channel with the channel number of x is non-empty, if not, writing analog data in the FIF0 buffer area corresponding to the channel with the channel number of x into a data buffer area in the network converter; wherein the data buffer area is an A/B double buffer area;

when the total analog data in the data buffer area in the network converter reaches a complete channel number full-frame mapping table, forming channel number full-frame mapping table frame data, and writing the channel number full-frame mapping table frame data into a preset converter sending buffer area.

5. The telemetry communication multi-tandem network framing method of claim 4,

The upper computer transmits the channel number full-frame mapping table to the network converter through a ring network bus; and the upper computer sets the sampling rate for the network converter to be the least common multiple of the sampling rate of each channel connected with the network converter.

6. The telemetry communication multi-tandem network framing method of claim 4 wherein the process of transmitting the converter full-frame map to the network collector to cause the network collector to receive output data of the network converter in accordance with the converter full-frame map comprises:

transmitting the converter full-frame mapping table to the network collector;

The network collector is enabled to send a data request instruction to a network converter with a node number of y corresponding to a non-electric quantity telemetry parameter source P (i, y, x) in the converter full-frame mapping table based on the sampling rate set by the upper computer, so that the network converter with the node number of y can transmit the channel number full-frame mapping table frame data in the converter sending buffer zone back to the network collector as output data of the network converter;

the network collector orderly writes output data of the network converter y into a FIF0 buffer zone corresponding to the network converter y in the network collector as a data frame according to the node number y of the network converter; the network collector is initialized with 64 FIF0 buffer areas according to the maximum quantity of the network converters;

Judging whether the FIF0 buffer area corresponding to the network converter y is non-empty, if not, writing the data frame in the FIF0 buffer area corresponding to the network converter into the data buffer area in the network collector; wherein the data buffer area is an A/B double buffer area;

when the total amount of data frames in a data buffer area in the network collector reaches a complete full-frame mapping table of the exchanger, forming frame data of the full-frame mapping table of the exchanger, and writing the frame data of the full-frame mapping table of the exchanger into a preset collector sending buffer area.

7. The telemetry communication multi-tandem network framing method of claim 6 wherein, when said transducer full frame map is sent to said network collector,

And the upper computer stores the bound full-frame mapping table of the converter in a nonvolatile flash memory of the network collector, and stores the full-frame mapping table of the converter in a data buffer area of the network collector after the network collector is electrified and initialized.

8. The telemetry communication multi-tandem network framing method of claim 6 wherein transmitting the collector full-frame map to the network synthesizer to cause the network synthesizer to receive output data of the network collector according to the collector full-frame map and cause the network synthesizer to map and summarize the received output data of the network collector based on the PCM map to complete a multi-tandem network framing process, comprising:

transmitting the collector full-frame mapping table to the network synthesizer according to a preset maximum sampling rate;

Adding a mapping relation of telemetry parameters, parallel delay data and stored retransmission data in the collector full-frame mapping table to form a PCM full-frame mapping table;

The network synthesizer is enabled to send a data request instruction to a network collector with a node number z corresponding to a non-electric quantity telemetry parameter source P (z, y, x) in the PCM full frame based on the sampling rate set by the upper computer, so that the network collector with the node number z can send frame data of a full frame mapping table of a switch in a buffer zone of the collector to be used as output data of the network collector to be transmitted back to the network synthesizer;

The network synthesizer orderly writes output data of the network collector z into a FIF0 buffer zone corresponding to the network collector z in the network synthesizer as a data frame according to the node number z of the network collector; the network synthesizer initializes 16 FIF0 buffer areas according to the maximum quantity of the network collectors;

Judging whether the FIF0 buffer area corresponding to the network collector z is non-empty, if not, writing the data frame in the FIF0 buffer area corresponding to the network collector into the data buffer area in the network synthesizer; wherein the data buffer area is an A/B double buffer area;

when the total data frame quantity in the data buffer zone in the network synthesizer reaches a complete PCM full-frame mapping table, forming full-frame mapping table frame data, and sending the full-frame mapping table frame data to a preset PCM frame coding module to finish multi-cascade network frame coding.

9. The telemetry communication multi-tandem network framing method of claim 8 wherein said network synthesizer receives output data of said network collector in accordance with said collector full frame map and further comprising:

and receiving a binding instruction about a PCM mapping table sent by the upper computer, and feeding back state information of each sub-module in the network collector, the network converter and the network synthesizer to the upper computer.

10. A telemetry communication multi-tandem network frame system, characterized by implementing a telemetry communication multi-tandem network frame method as claimed in any one of claims 1-9, comprising:

A first-level ring network formed by a network collector and a network converter in telemetering communication, and a second-level ring network formed by a network synthesizer and the network collector; the network collector is a master station of the primary ring network, and the network converter is a slave station of the primary ring network; the network collector is a secondary station of the secondary ring network at the same time, and the network synthesizer is a primary station of the secondary ring network;

and the upper computer is used for respectively distributing node numbers to nodes of each network device according to the MAC addresses of each network device in the primary ring network and the secondary ring network, compiling a PCM mapping table according to a preset non-electric quantity telemetry parameter source based on the node numbers, enabling a main station in the primary ring network and the secondary ring network to respectively receive telemetry data in each slave station according to the PCM mapping table, enabling the network synthesizer to dynamically receive all telemetry data, and enabling the telemetry data to correspond to the PCM mapping table so as to complete multi-cascade network framing.