JPS596439B2 - Data transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission method applied to, for example, a pollution telemeter device, and particularly relates to a data transmission method that is applied to a pollution telemeter device, and in particular, pulse integrated data that is missing for a desired period due to a power cut to the device, or if there is no power cut. The present invention relates to a data transmission method for transmitting a signal that has been determined to be correct pulse data without missing data.

A conventional wired pollution monitoring telemeter device has a configuration as shown in FIGS. 1 and 2.

That is, the data processing device 1 sends a station selection code and a polling signal such as a fixed call or an arbitrary call to the telemeter receiving device 2 of the master station, which is a central monitoring station. The telemeter receiving device 2 of the master station, which has received this polling signal, selects a transmission line corresponding to the station selection code, for example 3a, from among the transmission lines 3a to 3n, and transmits the polling signal to the transmission line 3a. In the telemeter transmission M 4a of the slave station, which is an observation station, when the transmitted polling signal is demodulated by the demodulation circuit 4-1 and received by the reception circuit 4-2, a transmission start signal is received from the polling signal detection circuit 4-3. Transmission control circuit 4-
Supply to 4. As a result, the transmission control circuit 4-4 sequentially switches and scans the input switching circuit 4-5, and sends the analog signal, contact signal, and pulse integrated value signal to the transmission circuit 4-6. 4-1 is a modulator.

Note that 5a, 5b, . . . , 5n are measuring devices that constantly measure sulfur dioxide gas 502, etc., 5-1 is an analog output type measurement system, and 5-2 is a device that sends a failure signal for the measuring device 5a. A contact output system, 5-3 is a pulse output system.

The measuring instruments 5b, . . . , 5n also have a similar signal output system. 4-8 is a pulse counter.

The measurement data on the slave station side is sequentially sent to the transmission circuit 4-6 by the switching scan of the input switching circuit 4-5, where it is converted into a digital signal and then modulated to the telemeter receiving device 2, which is the master station. Transmit to.

In the master station, this data is processed by the data processing device 1. Next, an example of conventional pulse integrated value transmission will be described.

Normally, in a pollution telemeter device, a polling signal is transmitted from a master station every hour, and information (measured values of analog signals, contact signals, and pulse signals) of slave stations at that time is collected. Regarding pulses, a pulse counter 4-8 in the slave station device collects the pulse integrated value between one polling and the next polling (in this case, one hour). The data processing device 1 uses the pulse integrated values collected by the master station every hour to add up, for example, 24 pulse integrated values (one day's worth), divides it by 24, and calculates the pulse integrated value for one day. Performs data processing such as finding the average of pulse integrated values. At this time, in the slave station device, since the pulse counter 4-8 and the transmitting/receiving circuits 4-6 and 4-2 are powered by the same power source, if the power is turned off, the accumulated contents of the pulse counter 4-8 is destroyed. After that, when the power is turned on, the contents of the pulse counters 4-8 at the time the power was turned on remain destroyed (normally, when the power is turned on, the hardware is initialized, so the pulse integrated value is zero), and the erroneous Pulse integration starts from this state. At this time, when receiving a polling signal from the master station, this erroneous pulse integrated value will be transmitted. In this way, when the hourly integrated pulse value collected by polling from the master station no longer was a normal value, it was not possible to determine whether the integrated value was incorrect data or not. The average of one day's worth of integrated pulse values, including erroneous data, was calculated, resulting in a lack of reliability in the data processing results. Note that when the slave station device is in a power-off state, no response is obtained from the slave station device even if polling is issued from the master station, and the pulse integrated value is also missing. In an example of average value calculation processing, it prints and outputs an abnormality that indicates that data at a certain time is missing, and also outputs the average value of normal data excluding missing values, which can be done systemically. I was taking the next best option. As mentioned above, missing values in data can be tolerated by taking system-based workarounds, but in the past, data was processed including erroneous data, resulting in unreliable processing results. As a result, there was a drawback that the utilization of the processing results was significantly hindered. The present invention has been made in view of the above-mentioned points.The present invention has been made in view of the above-mentioned points.The present invention has been made in view of the above-mentioned problems. On the other hand, the master station side receives a determination signal indicating the presence or absence of missing data and pulse integration data sent from the slave station side using a polling signal, and the determination signal indicates that there is a missing measurement. It is an object of the present invention to provide a data transmission system that can obtain correct data by performing data processing such as removing pulse integrated data when

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 3, a data processing device 11 receives data from a telemeter receiving device 12, which is a master station, and performs data processing. It should be noted that the data processing device 11 sends a station selection code and polling signals such as regular paging and arbitrary paging. Also, telemeter receiving device 1
2 are telemeter transmitting devices 14a, 14b, . . . , 14n installed at predetermined locations in remote locations and transmission lines 13a,
13b, . . . , 13n. This telemeter transmitting device 14a includes a demodulating circuit 14-1 that demodulates a polling signal, and a receiving circuit 14-2 that receives a demodulated signal.
, a polling signal detection circuit 14-3, and an input switching circuit 14-5 which sequentially scans a plurality of data by switching the plurality of data by a transmission control circuit 14-4. 14
-6 is a transmission circuit that digitizes the signal sent through the input switching circuit 14-5, and 14-7 is a modulation circuit that modulates the digital signal.

14-8 is a pulse counter.

This telemeter transmitting device 14a differs from conventional devices in that it includes a power-off detection circuit 14-9 controlled by a transmission control circuit 14-4.

As shown in FIG. 4, this power-off detection circuit 14-9 includes an initialization circuit 14-9a which detects the power supply of the slave station and outputs a set signal in the event of an abnormality, and which is set in response to a polling signal. The flip-flop circuit 1 is reset by the reset signal of the initialization circuit 14-9a.
4-9b, and as shown in the time chart of the power-off detection circuit in FIG.
9b is set (or reset) when the power goes from on to off, and is set (or reset) by the reset signal of the pulse counter 14-8 based on the polling signal from the master station. A set output is generated unless the power is cut off between one polling signal and the next polling signal. Note that INIT is an initialization signal, and PRS is a pulse counter 1 using a polling signal.
4-8 reset signal and flip-flop circuit 14
The setting signal FO -9b is the output of the flip-flop circuit 14-9b. Then, the power-off detection circuit 14
The output signal FO of the flip-flop circuit -9 passes through the input switching circuit 14-5, and the output FO immediately before receiving the polling signal is supplied to the transmitting circuit 14-6. In addition, 1
Reference numeral 5a denotes a measuring device, and this measuring means includes, for example, as shown in FIG.
-3.

Next, the operation of the above device will be explained with reference to FIG. First, the power of the telemeter transmitter 14a is turned on from off as shown in FIG. 6a. Since no polling signal is received, the flip-flop circuit maintains the reset state. Pulse counter 1 whose counting contents were cleared when the power was cut off
4-8 starts pulse integration (see Figure 6g). Next, a polling signal is sent from the master station to the slave station.

The slave station demodulates and receives it, and polling signal detection circuit 1
4-3 (see FIG. 6d), a transmission start signal is given to the transmission control circuit 14-4, the input switching circuit 14-5 is switched and scanned, and the pulse counter 14-8 immediately before the polling signal is generated is detected. The integrated data and the zero (reset state) of the set output terminal of the flip-flop circuit are sent to the master station. After transmitting the integration data from the slave station, the pulse counter 14-8 is reset to start integration again. At the same time, the flip-flop of the power-off detection circuit 14-9 is
Set up the flop circuit. The master station side receives the data of zero of the reset state output of the flip-flop circuit 14-9b immediately before the polling signal is generated and the pulse integrated value of the pulse counter 14-8 of the slave station side. Based on the zero circuit reset state output, data processing is performed in which the pulse integrated value is not adopted as final data. After a desired time has elapsed since the previous polling signal, the next polling signal is given from the master station to the slave station.

Upon receiving this polling signal, the slave station transmits the integrated data of the counter and the set output terminal of the flip-flop circuit to "1" (set state) to the master station, resets this counter, and at the same time outputs the flip-flop circuit. A set signal is applied to the set input terminal of the flop circuit to set it. The master station receives the set state signal "1", determines that there was no power outage on the slave station between the previous polling signal and the current polling signal, assumes that the integrated data of the counter is normal, and then returns the data. Process. If there is an instantaneous power outage after the polling signal is generated and the slave station side receives the polling signal again, the flip-flop circuit enters the reset state due to the instantaneous power outage. If the master station receives the zero of the reset state output of the flip-flop circuit immediately before receiving this polling signal and the accumulated data of the counter, the next one from the polling signal to the slave station is transferred from the zero of the reset state output of the flip-flop circuit to the slave station. It is determined that there has been a power outage while the polling signal is generated, the integrated data is considered to be abnormal, and data processing is performed that does not use this integrated data. In other words, the data processing device determines whether or not to use the integrated data as the final data depending on the presence or absence of the set output of the flip-flop circuit set by the polling signal during the period from the previous polling signal to the current polling signal. Process data while making decisions. In this way, the polling signal is always received and it is determined that it is normal before data processing is performed using the integrated data on the slave station side. There is no data processing involved. As described in detail above, according to the present invention, after the power on the slave station side is turned on from off, the previous integrated value is erased and re-counted by reception of the polling signal, and the power-off detection circuit Since the pulse integrated data on the slave station side is transmitted to the master station by sending a more normal signal, when the power is turned back on from off, data processing is performed using an integrated value that is different from the true integrated value. Therefore, data processing can always be performed based on true pulse integration data, and data processing can be made more appropriate, thereby increasing the reliability of the device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a conventional device, FIG. 2 is a block diagram specifically showing the slave station side of the device shown in FIG. 1, and FIGS. 3 is a block diagram of the device, FIG. 4 is a diagram showing an example of the configuration of a power-off detection circuit, FIG. 5 is a time chart of the power-off detection circuit, and FIG. 6 is a diagram of a power-off detection circuit. 3 is a time chart illustrating the operation of the device shown in the figure. 11... Data processing device, 12... Telemeter receiving device (master station side), 14a... Telemeter transmitting device (slave station side), 14-1... ...Demodulation circuit, 14-2...Reception circuit, 14-3...
...Polling signal detection circuit, 14-4...
Transmission control circuit, 14-5...Input switching circuit, 1
4-6...Transmission circuit, 14-7...Modulation circuit, 14-8...Pulse counter, 14-
9...Power failure detection circuit, 14-9a...
・Initialization circuit, 14-9b...Flip-flop circuit, 15a...Measuring instrument, 15-
1...Analog output system, 15-2...
Contact output system, 15-3...Pulse output system.

Claims (1)

[Claims] 1 In a system where the slave station receives the polling signal from the master station and sends out the cumulative data of a pulse counter whose counting is controlled by the boring signal, the master station processes the received cumulative data and outputs the final data. The station includes an initialization circuit that outputs a reset signal when the power of the slave station is turned off, and a flip that is set by the polling signal, reset by the reset signal, and outputs whether or not the power has been turned off from one polling signal to the next polling signal.・Equipped with a flop circuit and means for transmitting the output of the flip-flop circuit immediately before receiving the polling signal and the count value of the pulse counter to the master station side, and the master station A data processing device that inputs the output and count value of the flip-flop circuit sent from the station and does not use the count value as final data when the output of the flip-flop circuit indicates that the power has been cut off between polling signals. A data transmission method characterized by: