CN200983101Y - A remote communication, monitoring and human-machine interface control module - Google Patents

Abstract

The utility model relates to a communication remote monitoring and control man-machine interface module, RS-485 communication interface circuit, central microprocessor, key function circuit, storage unit E ² PROM, LED display circuit, liquid crystal display circuit, embedded communication And display and operation processing software; use the RS-485 communication interface to realize the connection between the remote display control module and the main body, the central microprocessor processes the received information, and then outputs it through the display of LED and LCD, and can respond to the operation of the buttons Request, transmit the command to the main body in the form of Modbus data packet. Among them, the display interface of the liquid crystal adopts the method of menu, and realizes the monitoring of various parameters, the setting of specific parameters, and the control of the motor through key operation. The preservation of certain set values can be realized through the storage unit ^E2PROM . The interface module has a friendly man-machine interface, can solve the problem of data monitoring and control widely used in MODBUS communication equipment, and improves the convenience of man-machine dialogue.

Description

A communication remote monitoring and control man-machine interface module

technical field

The utility model relates to an industrial control type communicative remote monitoring and control man-machine interface module, more precisely relates to a MODBUS communication remote monitoring and control man-machine interface module, which belongs to the field bus technology field.

technical background

At present, most of the industrial control communicable products at home and abroad use the ModBus communication protocol, and in some occasions, users often rely on computers when they need to monitor the data on the MODBUS network or control products with MODBUS communication interfaces. Inconvenience costs and increased costs.

The man-machine interface module can be easily connected to the MODBUS network for parameter monitoring and control, with low cost and small size. The product is novel in terms of convenient man-machine dialogue.

The man-machine interface module is the first in China in terms of ModBus network data monitoring and control, user-defined network variable address, and easy operation.

Contents of the invention

The purpose of this utility model is to provide a MODBUS communication remote monitoring and control man-machine interface module, the module is used in some industrial control equipment configuration projects, to provide users with convenient and low-cost man-machine interface, users monitor MODBUS network data more intuitive.

In order to achieve the above object, the technical solution of the present utility model is: in terms of hardware, realize the connection between the remote display control module (VD1M) and the main body (VD1) with the RS-485 serial communication interface. The information is processed, and then output through the display of LED and LCD, and can respond to the operation request of the button, and transmit the specific command to the main body in the form of Modbus data packet. The LCD display interface adopts the method of menu, and the user can conveniently The monitoring of various parameters, the setting of specific parameters, and the control of the motor can be realized through key operation. Some setting values can be saved through EEPROM. The working power supply of VD1M is 5V, which can be provided directly by VD1 or in the form of independent power supply; in terms of software, the module integrates embedded MODBUS protocol software, embedded menu display and key operation processing software, embedded parameter identification and Modify the software, as well as the host computer configuration software.

Beneficial effects of the utility model: the man-machine interface module can solve the problem of data monitoring and control widely used in MODBUS communication equipment, improve the convenience of man-machine dialogue, has a large market demand, and has a good promotion and application prospect. range of use.

Description of drawings

Fig. 1 is the block diagram of the hardware principle of the MODBUS communication remote monitoring and control man-machine interface module of the present invention;

Fig. 2 (Fig. 2.1~Fig. 2.9) is the hardware principle diagram of the MODBUS communication remote monitoring and control man-machine interface module of the present invention;

Fig. 3 is a flow chart of the utility model MODBUS communication remote monitoring and control man-machine interface software.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

With reference to Fig. 1, this is the system principle block diagram of the present utility model, comprises following several parts: (figure number will be adjusted accordingly) RS485 communication interface circuit 2, central microprocessor 3, key action circuit 4, storage unit E ² PROM 5. LED display circuit 6, liquid crystal display circuit 7, working power supply 8.

The MCU realizes the sending and receiving of Modbus messages and the processing of various information and operations through the programs embedded in it. The RS-485 communication interface establishes a channel between the MCU of VD1M and VD1, realizing the link layer and physical layer functions of network communication. The MCU judges whether there is an operation request by scanning the keys, and gives a response. The message and result pass LED and liquid crystal display output. The liquid crystal display interface adopts the menu method, and the user can easily realize the monitoring of various parameters, the setting of specific parameters, and the control of the motor through key operations. Some setting values can be saved through EEPROM. The working power supply of VD1M is 5V, which can be provided directly by VD1 or in the form of independent power supply.

Referring to Figure 2.1, this is the wiring diagram of the MCU. The selected MCU is STC89C516RD+. As shown in the pin network identification in the figure, RXD, TXD, and MDS are connected to the RS-485 communication interface, and MDS is the transceiver selection terminal. Transmit enable when high level, receive enable when low level, P33, P34, P35, P36, P37 are respectively connected to 5 LED display output drive terminals. D/I is connected to the data/command selection terminal of LCD, R/W Connected to the read/write control terminal of the LCD, E connected to the enable terminal of the LCD, DB0-DB7 connected to the 8 data bits of the LCD, CS1, CS2 connected to the chip selection terminal of the LCD, RST connected to the reset signal terminal of the LCD , EL1 is connected to the backlight control terminal of the LCD. P10-P17 are connected to 8 keys. REST is connected to the reset chip IMP810.P40, P20, P21, P22 to the EEPROM chip.

Figure 2.2 is the MCU port line pull-up circuit, which connects each pin of the MCU to VCC through a 10K exclusion to raise the level and enhance the drive capability of the chip port line.

Figure 2.3 is the RS-485 communication interface circuit. Chip 75176 is used to realize message sending and receiving and level conversion. 485-1A, 485-1B are signal lines on the transmission network, connected to the RS-485 communication interface of the main body. When VD1M wants to send a message, set MDS to 1, MCU transmits the serial data to 75176 through TXD, converts it into a differential level signal by 75176, and outputs it to the network transmission line 485-1A and 485-1B from the A and B pins , is received by the ontology, realizing the sending of data. When VD1M wants to receive messages, set MDS to 0, and the information sent by the main body reaches the A and B terminals of 75176 through the network transmission lines 485-1A, 485-1B, and 75176 converts the differential signal into a TTL level signal, which is input to the MCU by RXD , to achieve data reception. In the communication, VD1M acts as the master, and the main body is the slave. The pull-up resistor RA and the pull-down resistor RB are used to ensure that the non-connected 75176 chip is in an idle state and provide network failure protection to improve the reliability of the RS-485 node and the network. RAB is a terminal matching resistor. LA, LB, CA, CB, NUP1, LU1, CU1 are optional installation components for suppressing interference and improving the EMI performance of the circuit.

Figure 2.4 is the LED display output circuit. There are 5 channels in total, controlling 5 LEDs respectively. The purpose of connecting the triode is to enhance the driving ability of the MCU output line.

Figure 2.5 is the liquid crystal display output circuit. It is connected with MCU in parallel, and the specific wiring has been described in detail above. The liquid crystal is a 128×64 dot matrix liquid crystal. RTJ is a potentiometer to adjust the contrast of LCD.

Figure 2.6 is the connection circuit of the button. The utility model adopts the thin film button, which is made into the form of surface film, which can save space, reduce the volume of the product, and is simple and beautiful. The MCU scans to detect whether there is a button action. When the button is pressed, the level of the port line P10-P17 changes, and the MCU judges whether it is a valid action and gives a response. The debounce of the buttons is completely judged by software, which saves hardware costs. There are 8 buttons in this product, 4 of which directly control the motor, which are stop, reset, start A, and start B. The remaining 4 buttons are used for the operation of the LCD interface menu.

Figure 2.7 is the reset circuit of the MCU. Using reset chip IMP810. Play the role of power-on reset and power-off reset.

Figure 2.8 is an EEPROM storage circuit. The chip 93C66 is used as a backup function, which can be used in some situations that need to be saved after power-off.

Figure 2.9 is the wiring circuit of programming program. Connect with the dedicated programming head of the STC chip, use the programming software of the STC, and program the program through the serial IO ports RXD and TXD of the MCU.

With reference to Fig. 3, this is the software main program flowchart of the present utility model.

The parameters are explained as follows: bb-main cycle time flag; dd-no operation time flag; 1-interface layer number; m-menu layer number; runflag-run flag; faultflag-fault flag; alarmflag-alarm flag; P4 1-MCU port Line, connected to the LCD backlight control terminal.

The process steps are as follows:

From <power-on initialization>9, to <ls to (bb>100), and l! = 2, and l! =8, and (l=7&&m=3)? >10 to judge, if no, enter <key scan> 22; if yes, enter <bb=0, read running status, set runflag, click corresponding LED> 11, <read fault status> 12, <fault or not> 13 to judge, if yes, enter <set fault, click LEDS> 14; if not, enter <read alarm status> 15, <whether there is an alarm> 16 to judge, if yes, enter <set alarm, click LED4> 17; If not, enter <1=0>18 for judgment, if not, enter <1=7&&m=0? >19 to judge, if not, enter <key scan>22; if yes, enter <real-time parameter refresh>21; enter <1=0>18, if yes, enter <standby real-time parameter refresh>20, Enter <button scanning> 22, <whether there is a button> 23 to judge, if yes, then enter <dd=0; button function> 24; if not, then enter <dd>3000? (No operation for 30s?)>25 to judge, if not, then return <ls to (bb>100), and l! = 2, and l! =8(1=&&m=3)? >10; if yes, enter <P4-1=1 (backlight off)>26, then enter <(dd>1000)&&(l!=0)&&(l!=7)//(1=7) &&(m!=0)))? >27, if yes, go to <1=0, jump back to standby interface >28.

Claims (4)

1. A man-machine interface module capable of remote monitoring and control via communication, characterized in that the module includes an RS-485 communication interface circuit, a central microprocessor, a key function circuit, a storage unit E ² PROM, an LED display circuit, and a liquid crystal display Circuits, embedded communication and display and operation processing software; Realize the connection between the remote display control module (VD1M) and the main body (VD1) with the RS-485 communication interface, process the received information through the central microprocessor in the VD1M, and then output through the LED and LCD display, and can respond The operation request of the button transmits the specific command to the main body in the form of Modbus data packets. The LCD display interface adopts the menu method, and the monitoring of various parameters, the setting of specific parameters, and the control of the motor are realized through button operations. Control, through the storage unit E ² PROM can realize the preservation of some set values. 2. The man-machine interface module capable of remote monitoring and control with communication as claimed in claim 1, characterized in that: for the central microprocessor, the selected MCU is STC89C516RD+. 3. The man-machine interface module capable of communicating with remote monitoring and control as claimed in claim 1, characterized in that: said MCU is connected with a port line pull-up circuit to raise the level and enhance chip port line drive, which Connect each pin of MCU to VCC through 10K exclusion. 4. The man-machine interface module capable of remote monitoring and control with communication as claimed in claim 1, characterized in that: said RS-485 communication interface circuit adopts chip 75176.

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