JPS5829243A - Signal monitoring device of transmission system - Google Patents

Abstract

PURPOSE:To improve the reliability of a transmission system with simple constitution by detecting a data error on a transmission line through a monitoring device provided in common to respective receiving stations while making an error check at each receiving station. CONSTITUTION:When a transmitter 21 and a receiver 22 are selected through the address designation of a controller 20, the transmitter 21 transmits data together with an added error check code. This transmitted data, while received by the receiver 22, is received by a monitoring device 26 provided in common. Those receiver 22 and monitoring device 26 check an error in the received data. Error check information from the monitoring device 26 is transmitted onto a transmission line as status information in response to a request from the controller 20. Therefore, maintenance control over the transmission system is exercised on the basis of said status information, so the reliability of the transmission system is improved by providing only one monitoring device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission system monitoring device, which is a signal supervisor 111111KII of a transmission system that checks all transmitted and received signals on a transmission path.

Generally, when monitoring the transmitted and received signals of a transmission device consisting of a transmitting device and a receiving device, it is difficult to determine the authenticity of the data by checking the parity code or CaC code generated by the transmitting device with the receiving device. I am a connoisseur. This conventional method is based on the premise that the checking function of the receiving device operates normally.

Figure w&1 shows a conventional transmission system, in which a transmission path connected by a party line includes a transmitting device 11 having the same address 1 as the controller 910, a receiving device 12, and another transmitting device having the same address 2. 13 and reception°
A device 14 and a transmission device 15 having an address Nt- are provided.

In this configuration, the controller IO is the address.

When the signal 3 is generated, the transmitter 11 and the receiver at12 are selected. Next, the transmitting device 11Fi transmits/data,
Transmit Chetuta code as signal 4.

The receiving device 12 receives the above signal, and if the check code is valid, outputs the received data.

Similarly, send with the same address 2! 1ii13 and
Transmission and reception are performed with the receiving device 14.

FIG. 2 cJ&) is the address signal of the controller 10, -
) is the transmission data and check code of the overconfidence device 11,
(C) shows the received data of the receiving device 12 and the check code. Similarly, K (d) is data transmitted by the transmitting device 13, and (C) is data received by the receiving device 14. As described above, it is difficult to say that it is sufficient if only the received data and the check code are checked by the selected receiving device.

Therefore, the present invention is capable of simultaneously checking the transmitted and received data of a digital transmission system for all transmitting/receiving devices at all times, as well as checking the check code generation operation of the transmitting device and the receiving device's check code generation operation. An object of the present invention is to provide a transmission system monitoring device for monitoring received data checking operations.

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 3 shows an embodiment of the present invention, and the transmission path 3 in the same figure has a control unit -
A transmitting device 21 having the same address 1 as the address 20, a receiving device 22, another transmitting device 23 having the same address 2, a receiving device 24, a transmitting device 25 having the address N, and a monitoring device 26 are connected.

In the above configuration, when the controller 20 selects the transmitting device 21 and the receiving device [22] having address 1, the transmitting device 21 transmits transmission data and a check code. This signal is transmitted not only to the receiving device 22 but also to the monitoring device 26 to check the received data and code. Similarly, transmission and reception are performed between the transmitting device 13 and the receiving device 14 having the same address 2, but this signal is transmitted to the monitoring device 26 and checked. Operation timing 4 is shown, (f) is the address signal of the controller 20, (gl is the transmission data and check code of the transmitter 21, (h)
are the received data of the receiving device 22 and the check code.Similarly, 1i) is the transmitted data of the transmitting device 23, (j
) is the received data of the receiving device 24 0 Here, (k) is the received data of the monitoring device 26 , and (k) is the received data of the transmitting device 21 . and receives data transmitted by the transmitting device 23.

As described above, the monitoring device 26 checks all data on the transmission path as a receiving device common to the transmission step 5. If the check result of the received data of each receiving device is equal to the check result of the monitoring device, it means that the transmission system is operating normally. However, if the check result of the receiving device and the check result of the monitoring device are not equal, it is assumed that there is an abnormality in the checking operation of the receiving device or the monitoring device, or on the transmission path. .

FIG. 5 shows the configuration of the signal monitoring device of the present invention. That is, as shown in FIG. 5, the signal monitoring device includes a receiving circuit 27, a check circuit 2B, and a status storage circuit 2.
9, and a transmission circuit 30, the status storage circuit 29 stores the result of checking the transmission data of each transmission/reception data, and if requested by the controller 20, the status is stored in the transmission line through the transmission circuit 30. can be output.

In addition, FIG. 6 shows another embodiment of the present invention, which is an enlarged version of the configuration described above, and is configured by two viewing devices 26m and 26b, and further improves the reliability of the transmission system. be.

In this manner, according to the present invention, the transmission data from the transmission device selected by the controller is checked by the reception device and at the same time, the transmission data is checked by the monitoring device common to the transmission system, thereby improving the reliability of the transmission system. can improve sexual performance. In addition, since the monitoring device saves the results of checking the data between each transmitting and receiving device as a status, the status of the transmission system can be output to the controller all at once, making maintenance and monitoring of the transmission system easier. It can be done with tools.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram of a conventional transmission system, and FIG. 2 is a timing chart showing the operation of the transmission system of FIG. 1.
FIG. 3 is an explanatory diagram of the configuration of a transmission system showing an embodiment of the present invention, FIG. 4 is a timing chart showing the operation of the transmission system of the present invention, and FIG. The block diagram shown in FIG. 6 is a configuration explanatory diagram of seven transmission stems showing another embodiment of the present invention. 3...Address signal 4...Transmission/reception signal 10.2
0... Controller 11, 13, 21. 23... Transmitting device 12, 14. 22.24... Receiving device 15.
25...Transmission i! ! 26.26m, 26b...Monitoring device 27...Receiving circuit 28/Check circuit 2
9・Status storage circuit 3G・Transmission circuit (7317) Representative Patent Attorney Tsuyoshi Chika Kensuke (and 1 other person) IML Diagram 2 (dJ 口 口 口

Claims (1)

[Claims] In a transmission system comprising a controller that generates an address signal, and a plurality of transmitting devices and receiving devices that transmit and receive data in response to the address signal 4# via a transmission path connected by a party line, A reception circuit for inputting the address signal of the controller and transmission/reception data of the transmission/reception device, a check circuit, a status storage circuit for storing and outputting the output of the check circuit, and a transmission line are provided on the party line. A signal monitoring device for a transmission system that checks all transmitted and received data and outputs the results as a status to the controller.