JPH0659067B2 - Communication control circuit method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a communication control circuit system for performing communication between a computer system or various devices via a bidirectional bus line,
In particular, the present invention relates to a communication control circuit system including a monitor display control unit for a bidirectional bus line, which is suitable for investigation when an abnormality occurs in the communication control unit.

[Background of the Invention]

As a configuration of a communication control unit of a computer system or the like in a conventional computer system or a communication system in which various devices communicate with each other via a bidirectional bus line, the system of the conventional communication control unit block diagram of FIG. 3 is generally used. Therefore, no special improvement measures are taken in the communication control unit 3 in terms of maintenance such as the monitor display function of the bidirectional bus line 2. Therefore, when the communication control unit 3 is maintained or a communication operation error occurs, a dedicated bus analyzer or the like is directly connected to the bidirectional bus line 2 for investigation, but for observation on the bidirectional bus line 2. , It will take a long time to determine which computer system or device outputs,
There was a problem in terms of maintenance. Further, since a dedicated bus analyzer or the like is directly connected to the bidirectional bus line 2, there is an adverse effect due to a change in load condition on the bus line. Systems related to this kind of system are, for example, IEEE-S according to the standard defined by the Institute of Electronics and Electrical Engineers of America.
Examples include TD-488 and a system to which a standard interface bus is applied.

[Object of the Invention]

An object of the present invention is to easily identify the input / output direction of the information input / output to / from the computer system without directly detecting the transmission information of the bidirectional bus line connecting the computer systems and to check the state of the input / output communication information. It is to provide a communication control circuit system capable of monitoring.

[Outline of Invention]

In order to achieve the above-mentioned object, the present invention is connected to a designated computer system to exchange information with this computer system and generate an input / output direction indicating signal indicating the input / output direction of information when inputting / outputting information. The communication control circuit unit is inserted between the communication control circuit unit and a bidirectional bus line connected to another computer system different from the computer system, and the communication control circuit unit is operated according to an input / output direction instruction signal from the communication control circuit unit. A bus transceiver for exchanging information with both the bidirectional bus line and the communication control circuit unit, and a display for identifying the state of information according to the direction of information transmitted between the communication control circuit unit and the bus transceiver The display mode designating section for designating the display mode during transmission, the display mode during reception, or the display mode during transmission and reception, and the above-mentioned display mode. The display permission signal is determined only when the direction of the information corresponding to the display mode designated by the display designating unit and the direction designated by the input / output direction designating signal by the output of the communication control circuit unit are determined and the two directions match. And a display signal according to this information that is transmitted between the communication control circuit unit and the bus transceiver on condition that a display permission signal is output from the display control circuit unit. The communication control circuit system is provided with a display circuit section for outputting and a display section for displaying the content of the display signal from the display circuit section.

[Embodiment of the Invention] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing the whole, and 11 ₁ to 1 _n computer systems or various devices are respectively connected by 2 bidirectional bus lines. With such a configuration, a computer system or a system for communicating between various devices is formed. Here, it is assumed that 1 ₁ to 1 _n computer systems or 1 system or 1 device out of various devices can be in a position to control the entire communication system and perform operations such as predetermined calculation, control, monitoring, and alarm. , No more than one system or device may be in this position at the same time. However, the position of controlling the entire communication system can be changed. Further, various devices herein include various measuring instruments or various input / output devices. On the other hand, the bidirectional bus line 2 includes a data line for exchanging information between each system or each device, a handshake line for timing, and a management line for managing communication. Next, a specific configuration of the communication control unit 3 of the computer system connected to the bidirectional bus line 2 will be described.

The communication control unit 3 includes a communication control circuit unit 4, a bus transceiver 5, a display mode designating unit 6, a display control circuit unit 7, a display circuit unit 8, and a display unit 9. The communication control circuit unit 4 is incorporated in the computer main body. The bus transceiver 5 is connected to the bidirectional bus line 2, and the communication control circuit unit 4, the bus transceiver 5 and the display circuit unit 8 are connected to each other via the internal bidirectional bus line. Then, the interface signal 10 is transmitted between the computer and the communication control circuit unit 4.
The input / output signal 11 is exchanged between the communication control circuit unit 4, the bus transceiver 5, and the display circuit unit 8.

The communication control circuit unit 4 is connected to a designated computer system to exchange information with this computer system, and displays an input / output direction instruction signal 11 indicating the input / output direction of information at the time of input / output of information as a bus transceiver 5. The data is output to the control circuit unit 7. The bus transceiver 5 is inserted between the bidirectional bus line 2 and the communication control circuit unit 4 which are connected to different computer systems, and the bidirectional bus line is operated according to the input / output direction instruction signal 11 from the communication control circuit unit 4. Information is exchanged with both the communication control circuit unit 2 and the communication control circuit unit 4.

The display mode designation unit 6 is a display mode at the time of transmission, a display mode at the time of reception, or a transmission / reception time at the time of transmission / reception as a display mode for identifying the state of information according to the direction of information transmitted between the communication control circuit unit 4 and the bus transceiver Designate one of the display modes and display mode designation signal 1 according to this designation
3 is output to the display control circuit unit 7. The display control circuit unit 7 is instructed by the direction of information according to the display mode designated by the display mode designation signal 13 from the display mode designation unit 6 and the input / output direction designation signal 12 by the output of the communication control circuit unit 4. The direction is determined, and the display permission signal 14 is output to the display circuit unit 8 only when the two directions match. The display circuit unit 8 takes in information transmitted between the communication control circuit unit 4 and the bus transceiver 5 on condition that the display permission signal 14 is output from the display control circuit unit 7, and the display signal according to this information is taken in. 15 is output to the display unit 9. The display unit 9 is configured to display the content of the display signal 15 from the display circuit unit 8.

In the above-described configuration, when the display mode at transmission is designated by the display mode designation unit 6, all the contents of the input / output signal 11 are transmitted as transmission information at the time of transmission when information is transmitted from the communication control circuit unit 4 via the bus transceiver 5. It is displayed on the display unit 9. On the other hand, when the display mode at reception is designated by the display mode designation unit 6, when the reception information is input to the communication control circuit unit 4 via the bus transceiver 5, all the contents of the input / output signal 11 are displayed as the reception information. Displayed in section 9. Further, when the display mode upon transmission / reception is designated by the display mode designation unit 6, all the contents of the reception information and the transmission information are displayed on the display unit 9.

Thus, in this embodiment, the bidirectional bus line 2
It is possible to identify the direction of information transmitted between the communication control circuit unit 4 and the bus transceiver 5 and to display the state of input / output communication information without directly connecting a bus analyzer or the like. Further, since the communication information can be displayed in accordance with the three kinds of display modes, it becomes easy to analyze a failure that occurs during transmission, a failure that occurs during reception, a failure that occurs during transmission and reception.

〔The invention's effect〕

As described above, according to the present invention, the input / output direction of the information input / output to / from the computer system can be easily identified and input without directly detecting the transmission information of the bidirectional bus line connecting the computer systems. All the states of the output communication information can be monitored according to the designation, which can contribute to the improvement of the failure analysis and the maintenance function.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram, FIG. 2 is a block diagram of a communication control unit in the computer system of FIG. 1 showing an embodiment, and FIG. 3 is a block diagram of a conventional communication control unit. 1 ₁ to 1 _n ... Computer system or various devices, 2 ... Bidirectional bus line, 3 ... Communication control unit of computer system, 4 ... Communication control circuit unit, 5 ... Bus transceiver, 6 ... Display Mode designation section, 7 ... Display control circuit section,
8 ... Display circuit section, 9 ... Display section, 10 ... Interface signal with computer etc., 11 ... Input / output signal to / from bidirectional bus line side, 12 ... Transceiver input / output direction instruction signal, 13 ... ... display mode designation signal, 14 ... display permission signal, 15 ... display signal.

Claims (1)

[Claims] 1. A communication control circuit unit connected to a designated computer system for exchanging information with the computer system and generating an input / output direction instruction signal indicating an input / output direction of information when inputting / outputting information, The bidirectional bus line and the communication are inserted between the bidirectional bus line connected to another computer system different from the computer system and the communication control circuit unit according to the input / output direction instruction signal from the communication control circuit unit. A bus transceiver that transmits and receives information to and from both the control circuit unit, and a display mode during transmission as a display mode for identifying the state of information according to the direction of information transmitted between the communication control circuit unit and the bus transceiver, A display mode designating section for designating either a display mode during reception or a display mode during transmission and reception, and a table designated by the display mode designating section. A display control circuit unit that determines the direction of information according to the mode and the direction instructed by the input / output direction instruction signal by the output of the communication control circuit unit, and outputs the display permission signal only when both directions match. A display circuit unit that takes in information transmitted between the communication control circuit unit and the bus transceiver on condition that a display permission signal is output from the display control circuit unit, and outputs a display signal according to this information, A communication control circuit system, comprising: a display unit for displaying the content of a display signal from the display circuit unit.