JPS61212147A - Communication control equipment provided with start-stop system line adaptor diagnostic function - Google Patents

Abstract

PURPOSE:To detect immediately a fault of a line adaptor in the course of operating an actual work by making the titled equipment have a function for turning back a series transmitting data as a desires receiving data, a function for detecting whether a receiving data from a communication line exists or not, and the function for delaying the receiving data from the communication line by exceeding the maximum time required for stopping a diagnosis of the line adaptor. CONSTITUTION:A series transmitting data signal 220 outputted from a start-stop transmitting part 22 is sent out to a communication line, and simultaneously, becomes an input of a start-stop receiving part 26 through a reception selecting circuit 25, converted to a parallel receiving data and returned to a communication processing part 1. A control program compares and collates the receiving data and the transmitting data which has been held. In case they do not coincide with each other, or other abnormality (for instance, the data is not received) is detected, it is informed immediately that a fault is generated in the course of operating a start-stop line adaptor 2, to a host device or an operator. In such a way, a fault of the line adaptor can be detected immediately, when an actual work is being operated, and also in case a data is sent from the other station, a diagnosis can be stopped without dropping the data.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an asynchronous line adapter capable of simultaneous data transmission by an asynchronous transmitter and data reception by an asynchronous receiver, that is, capable of full-duplex operation. The present invention relates to a communication control device that employs a full-duplex transmission control procedure.

[Conventional technology]

Conventionally, diagnosis of line adapters in this type of communication control equipment involves setting a special diagnostic mode by means such as instructions from a host device or hardware switch settings, and then using a special diagnostic program. Transmitted data from the host device is looped back within the line adapter as received data,
A diagnostic program compared and verified the transmitted data and the received data.

[Problem that the invention seeks to solve]

Therefore, diagnosis of line adapters could only be performed by interrupting actual business operations, and diagnosis during business operations was impossible.

Generally, communication lines connect geographically distant points, so failures have occurred in which it is not possible to infer which part of the data link is at fault based on the error phenomenon in the transmission control procedure that appears on the surface. In such cases, it requires a great deal of effort to detect the faulty part. Therefore, if a failure occurs in a line adapter or the like, it is desirable to be able to promptly notify an operator or the like. However, in the conventional method described above, if a line adapter breaks down during operation, the failure cannot be detected without a diagnostic program that is separate from the operating program, so it is not possible to promptly detect the failure of the line adapter. There are drawbacks.

An object of the present invention is to provide a start-stop line adapter diagnosis that can quickly detect a failure in an start-stop line adapter, and that can stop the diagnosis without losing data if data is sent from the partner station during diagnosis. There are many ways to provide a voice control device with functions.

[Means for solving problems]

In the present invention, after detecting a transition from a state in which data is being received from a communication line to an idle state specified in a transmission control procedure in a communication processing unit, the start-stop mode in the start-stop line adapter is maintained until the next data is received. Focusing on the fact that the receiving section is in an idle state, data is transmitted from the communication processing section during this state, and the data received by the start-stop line adapter is compared with the transmitted data. Diagnosis of start-stop type line adapters is performed during operation. Furthermore, in the full-duplex transmission control procedure, the present invention takes into consideration that data may be sent from the other station during the diagnosis of an asynchronous line adapter, and the present invention is designed to stop the diagnosis from being sent. It is designed to avoid inputting data into the start-stop type receiver after being delayed for more than the maximum time required, and to stop the diagnosis without losing any data if data is sent from the partner station during diagnosis. be.

That is, the communication control device with an asynchronous line adapter diagnostic function of the present invention includes an asynchronous transmission section that converts parallel transmission data provided from a communication processing section into an asynchronous serial transmission data signal and supplies the signal to a modem and modulation device; A reception data delay circuit that delays the start-stop serial reception data signal supplied from the modem and a reception selection circuit that selects and outputs either the serial transmission data signal or the serial reception data based on instructions from the communication processing section. a start-stop receiving section connected to the reception selection circuit and assembling the start-stop serial receiving data into parallel receiving data and supplying the parallel receiving data to the communication processing section; The start-stop line adapter is equipped with a start bit detection circuit that detects and notifies the communication processing unit, and if the start bit detection circuit does not detect a start bit in the serially received data signal, the start bit detection circuit detects the start bit and notifies it to the communication processing unit. By controlling the selection circuit and comparing the transmission data with the received data returned by the start-stop line adapter, the diagnosis of the start-stop line adapter is performed during actual operation, and after the start of the diagnosis, the above-mentioned start When the bit detection circuit detects a start bit in the serially received data signal, the communication processing section includes a control means that stops the diagnosis and controls the reception selection circuit to receive serially received data instead of the transmitted data. It is characterized by having.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a communication control device with a start-stop type line adapter diagnostic function according to the present invention.

This embodiment consists of a communication processing section 1 and an asynchronous line adapter 2. The start-stop type line adapter 2 has a common control circuit 21. Start-stop transmitter 22. Line interface circuit 23. Receive data delay circuit 24. Reception selection circuit 25. It consists of an asynchronous receiving section 26 and a start bit detection circuit 27. - The start-stop synchronization clock signal 214 is a 4-way signal with a speed of about 16 or 32 times the communication speed, and is transmitted from the common control circuit 21 to the start-stop transmitter 22. The signal is supplied to an asynchronous receiving section 26 and a start bit detection circuit 27. The parallel transmission data output from the communication processing section 1 to the start-stop type line adapter 2 is transmitted through the communication processing section interface signal 100 and the common line adapter 2.
Transmitter interface signal 21 via overcontrol circuit 21
1 is applied to the start-stop transmitter 22 as a parallel transmission data signal 210. The start-stop transmitter 22 converts the applied parallel transmission data into an start-stop serial data signal 220 and supplies it to the modulation/demodulation device 3 via the line interface circuit 23 and the @ line interface signal 200. This serial transmission data signal 220 is also input to input port A of the reception selection circuit 240. The start-stop type serial reception data signal 230 supplied from the modem [3] via the line interface signal 200 and the line interface circuit 23 is connected to the reception data delay circuit 24 and the start bit detection circuit 27.
The received data delay circuit 24 delays the serial received data signal 230 by an appropriate amount of time in synchronization with the delay clock signal 215 supplied from the common control circuit 21 (the amount of delay will be described later). The signal is input as a received data signal 240 to the input port B of the reception selection circuit 25. Note that the delay P clock signal 215 is a clock No. 1 having the same speed as or faster than the 5KiM step synchronization clock signal 214 so as not to distort the serially received data signal 230.

The reception selection circuit 24 connects the communication processing unit 1 to the common control circuit 21.
Depending on the state of the reception selection instruction signal 251 given via It is output as a data signal 250.

The start-stop type receiving section 26 inputs the selected serial reception data signal 250 supplied from the reception selection circuit 25, assembles the start-stop type serial reception data into parallel reception data, and outputs the parallel reception data signal 212. The communication processing unit l receives the reception unit interface signal 213 via the common control circuit 21.
and inputs the parallel reception data signal 212 as parallel reception data from the start-stop type line adapter 2. The start bit detection circuit 27 performs a start bit detection operation on the serially received data signal 230, and when a start bit is detected, notifies the multi-communication processing unit l by setting a start bit detection signal 270. . The communication processing unit 1 can initialize the distart bit detection circuit 27 by controlling the detection circuit reset signal 271 via the common control circuit 21.

In this initial state, the start bit detection signal 270
is in a reset state. In the general start-stop transmission control procedure used in communication lines, when there is no data to be transmitted, that is, in an idle state, the data line is marked (M
Since the state of 1) is maintained, the serial reception data signal 23
No start bit detected at 0 means that no data is being received from the communication line. Communication processing unit 1
After detecting the transition condition from the state in which data is being received from the communication line to the idle state specified in the transmission control procedure, the start-stop receiving unit 26 does not operate until a start bit is detected in the serially received data signal 230. Focusing on the idle state, when transmitting data from the start-stop transmitter 22 in this state, the reception selection circuit 25 is controlled to send the serial transmission data signal 220 to the start-stop receiver 26 as serial reception data. The content of the present invention is to diagnose the start-stop type line adapter 2 during operation.

The control program for the start-stop transmission control procedure executed by the communication processing unit 1 is created to control the start-stop line adapter 2 described above and to diagnose the start-stop line adapter 2 during operation. There is.

Next, the operation of this embodiment will be explained.

First, in the initial state of the start-stop type line adapter 2, the reception selection circuit 25 selects the delayed serial reception data signal 240, which is the signal of the input port B. Similarly to the start-stop transmitter 22 and the start-stop receiver 26, the start bit detection circuit 27 is also initialized and the start bit detection signal 270 is in a reset state. The start bit can be detected. When data is received from the communication line in this state, the start bit detection circuit 27 sets the start bit detection signal 270, and the start-stop receiving section 26 converts the serial reception data from the communication line supplied from the reception selection circuit 25 into parallel reception data. Assemble the parallel received data signals 212
The data is supplied to the communication processing unit 1 as a signal. The control program in the communication processing section 1 regards the received data when the start-stop type line adapter 2 is not being diagnosed as the received data from the communication line, and performs the processing specified in the normal transmission control procedure.

Thereafter, when the control program detects the reception termination condition specified in the transmission control procedure, it initializes the start-stop type receiving section 26 and also initializes the start bit detection circuit 27, so that the start bit detection signal 270 is reset. At this point, the serial reception data signal 230 should be in an idle state, so the start-stop line adapter 2 is in a state where it can detect a new start bit for the serial reception data signal 230, that is, new data transmission from the partner station. Become.

When the control program attempts to transmit data to the communication line when it is not receiving data from the communication line, it first checks the state of the start bit detection signal 270. If data is already being received from the communication line and the state of the start bit detection signal 270 is checked, the F!
! 4 (indicating that it has just started receiving data from the communication line), the start-stop line adapter 2 cannot be diagnosed during this transmission operation, and the control program will not send data to the normal communication line. Do only. If the start bit detection signal 270 is in the reset state when checked, the control program selects the reception selection instruction signal 2.
51 to select the serial transmission data signal 220, which is the input signal A, into the reception selection circuit 25, and then output parallel transmission data to the start-stop type transmission section 22 and transmit the parallel transmission data later. Retain it to check with the received data.

Serial transmission data signal 220 outputted by start-stop transmitter 22
is sent out to the communication line and at the same time is input to the start-stop type receiving unit 26 via the reception selection circuit 25. The multi-parallel received data (converted and returned to the communication processing unit l. The control program is held together with the received data. When the received transmission data are compared and verified, and a mismatch or other abnormality (for example, data is not received) is detected, a higher-level device or an operator is immediately notified of the occurrence of a failure during operation of the start-stop type line adapter 2.

In the full-duplex transmission control procedure, data may be sent from the other station while the diagnosis described above is being executed. In this case, the start bit detection circuit 27 detects the received data signal 230.
By detecting a start bit and setting a start bit detection signal 270, the communication processing unit IK notifies the arrival of received data from a multi-communication line. In this case, the control program cancels the currently running diagnosis and receives the reception selection instruction signal 2.
51 initializes the start-stop type receiving section 26 so that it can receive data received from the communication line. Therefore, data transmission to the communication line continues. When the start bit detection signal 270 is set, the received data delay circuit 2
4, the start bit has not yet reached the reception selection circuit 25, and the reception data delay circuit 24 delays the serial reception data signal 230 for more than the maximum time required for the above-mentioned control program diagnostic interruption process. The start-stop receiving section 26 never fails to receive data from the communication line.

If the diagnosis is successfully completed up to the end of the transmitted data, the control program returns the start-stop type line adapter 2 to its initial state and makes it possible to receive data from the next new communication line.

〔Effect of the invention〕

As described above, the present invention has a function of returning serially transmitted data as serially received data to the start-stop converter 87 adapter, a function of detecting the presence/absence of received data from a communication line, and a function of detecting the presence/absence of received data from a communication line. A function is provided to delay the adapter for more than the maximum time required to stop the diagnosis, and the communication processing unit executes the transmission control procedure and controls these functions.
And by comparing the received data and the transmitted data,
This has the effect that a fault in the line adapter can be detected immediately during actual business operation, and that if data is delayed from the partner station during diagnosis, the diagnosis can be stopped without losing data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication control device with a start-stop type line adapter diagnostic function according to the present invention. l...Communication processing unit, 2...Start-stop type line adapter. 3... Modulation/demodulation device, 21... Common control circuit, 22
... Start-stop transmitter, 23... Line interface circuit, 24... Received data delay circuit, 25...
Reception selection circuit, 26... Start-stop type receiving section, 27...
- Start bit detection circuit, 100... Communication processing unit interface number 1m, 200... Line interface signal, 210... Parallel transmission data signal, 211
v-... Transmitter interface number, 212...
Parallel received data signal, 213... Receiver interface signal, 214... Start-stop synchronization clock signal, 215... Delay clock signal, 220...
Serial transmission data signal, 230... Serial reception data signal, 240... Delayed serial reception data signal, 250.
... serial reception data signal after selection, 251 ... reception selection instruction signal, 270 ... start bit detection signal, 271 ... detection circuit reset signal.

Claims (1)

[Scope of Claims] A start-stop transmitting unit that converts parallel transmission data given from a communication processing unit into a start-stop serial transmission data signal and supplies the same to a modem, and a start-stop serial transmission data signal supplied from the modem. a receive data delay circuit that delays a receive data signal;
a reception selection circuit that selects and outputs either the serial transmission data signal or the serial reception data based on instructions from the communication processing section; and a reception selection circuit that is connected to the reception selection circuit and converts the asynchronous serial reception data to parallel reception data A start-stop type receiving unit is assembled to supply the communication processing unit to the communication processing unit, and a start-stop type detection circuit that detects a start bit in the serial reception data signal supplied from the modem and notifies the communication processing unit. If the start bit detection circuit does not detect a start bit in the serially received data signal, the line adapter controls the reception selection circuit during data transmission in actual business so that the transmission data is in the start-stop mode. Diagnosing the start-stop type line adapter during actual business operation by comparing and collating the received data returned by the line adapter with the transmitted data,
Further, if the start bit detection circuit detects a start bit in the serially received data signal after starting the diagnosis, the diagnosis is stopped and the receiving selection circuit is controlled to select the serially received data instead of the transmitted data. A communication control device with a start-stop type line adapter diagnostic function, characterized in that the communication processing unit has a control means for receiving.