JPS61123245A - Data transmission system - Google Patents

Abstract

PURPOSE:To test the normality of a high-order computer, a center and a terminal device by providing a function transmitting a data or a faulty state data to the high-order computer and a display function of a terminal device operation data transmitted from the high-order computer to the center device. CONSTITUTION:The center 3 controls correspondence between terminal devices 5 at normal operation and a terminal device operation signal received from the high-order computer 1 is transmitted to the termiinal device together with the terminal device address of destination. In conducting test, the center 3 sets an input signal data, a fault data or a state data given uniquely to a terminal device in place of the terminal device 5 as a test signaland transmits the data to the high-order computer 1 and displays the terminal device operation signal received from the high-order computer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a data transmission system equipped with a communication test function between a host computer and a center device connected via a serial transmission path such as an interface such as R8-232C. It is.

[Prior art and its problems]

The host computer and the center device of the data transmission system are
They are connected through standard interfaces such as s-232C and GD-IB, and the center device is used to transmit terminal operation signals received from the host computer to the terminal, and to transmit terminal input signals received from the terminal to the host computer. It is common that However, these systems differ in their individual characteristics, including host computers, center equipment, and terminal groups.

Moreover, since the system is a combination of functionally complex devices, it is necessary to determine where the abnormality is when first starting JC1h production or when an abnormality occurs in operation. is extremely difficult. Also,
For general-purpose signal transmission systems, it was necessary to manufacture them at low cost, and it was necessary to be able to easily find the cause of failures and to have the ability to check the operating status, but this required the equipment to be large and The drawback was that it did not have sufficient testing capabilities due to high costs and other reasons.

[Purpose of the invention]

This invention not only provides a test function that simply receives test data sent from a host computer or center device and sends the data directly as is, but also allows the center device to freely send test data to a terminal. It has a function to temporarily (temporarily) create data and send this terminal data, including terminal failure information, to the host computer.
Alternatively, in addition to testing whether the processing program on the host computer side can operate correctly when correctly received, by displaying the terminal operation signal sent from the host computer on the center device, you can display the transmitted data from the host computer and the center device. ~This is an attempt to provide a data transmission system that can easily test whether data transmission from a terminal is being performed correctly.

[Key points of the invention]

In this invention, in order to check the operating status of a transmission system, a center device independently creates input signal data, failure data, or status data given to a terminal in place of a terminal, and uses the data as test data. It has a test function that allows you to check whether the host computer side is operating correctly or whether the data is being transmitted correctly between the center device and the terminal by using the function of transmitting to the host computer and the function of displaying the terminal operation signal received from the host computer. It aims to provide a data transmission system.

[Embodiments of the invention]

FIG. 1 shows a schematic configuration diagram of a data transmission system according to the present invention.

In the figure, 1 is a host computer, 2 is a transmission path, 3 is a center device, 4 is a signal path, 5-1 to 5-n are terminal devices, 6 is a digital signal input source, and 7 is an analog signal input source. The center device 3 that controls transmission has multiple terminals ted
5-1 to 5-n via 1& route 48. As for the method of coupling the signal paths, either the so-called multi-drop method or the loop method can be used. The center device 3 controls the communication with the terminal 1, and also specifies the address or air address group of the terminal 5g when transmitting the message, and the terminal 44& corresponding to this address or address group participates in the data transmission. It has the function of transmitting the digital 1M manual input 6 and analog signal input 0IA7 inputted to the terminal device to the center device 3 or the destination terminal, and is generally cyclically transmitted under the initiative of the Tanabata device 3. Data transmission is often performed separately. In addition, the center device 3 sends the terminal operation signal received from the host computer 1 to the IC terminal device along with the address of the terminal device of the output light, and the terminal device receives data received from the center device or from the other party's terminal bag type. ! It has the function of repeating the data to the outside.

In addition, the terminal device inserts the data sent to %15 No. 4 without setting its own address, and when it receives the designation of the address assigned to itself, it reads the data at a predetermined timing. 7 #-w, ).

In addition, although FIG. 1 shows only representative numbers such as L and Z", the terminal device has 16 bits, 5 and 5, such as
A large number of signals can be connected to the

The center device 3 is coupled to the host computer 1 via a transmission line 2. The data received by the center device 3 from the terminal device is sent either voluntarily from the center device 3 or sent to the host computer.
The information is sent to the higher-level computer in accordance with the instructions of
The terminal data is monitored and used as control data to control the entire system incorporating the transmission system.

FIG. 2 shows a center device 31 provided with a display s, an LED lamp 9, and operation switches 10 used for testing. As a general function of the center device 30, such as setting the terminal address and displaying the data on the LED lamp 9 in order to display the received data of the terminal device, etc. is already performed as a general device, so here we will explain it here. Let's skip customs. In FIG. 2, only the test function portions related to the transmission interface between the center device 3 and the host computer 1 are shown.

The functions shown in Figure 2! At this point, the center device 30's microcombi and data system reads functions such as communication with the computer 1 or communication with the terminal device, as well as the operation status of the numeric keypad (not shown) and each operation switch shown, The user's request is decoded, and as a result, the terminal device address, failure state, or a code corresponding to the ms of data to be transmitted is displayed on the display 8. These functions of the center device 30 can be realized in various ways by using a microcomputer system for the center device 3, so the hardware and software configurations will not be particularly explained here. Referring to FIG. 2, functions according to the present invention will be explained. Center device 3p' instead of terminal data on host computer l
Using the operating switch and cello at 9, select operating switches 1 to 32 of the operating switch 10 according to the terminal data length and set the data. The setting state of this data is the operation switch 10.
If the Di test switch and Ji inside are turned on, it will be displayed on the LED lamp 9. Address S in operation switch 10
A terminal address is set by operating w and a numeric keypad (not shown), and is displayed on the display 8. In this state, the data to be sent to the host computer 1 is now ready. If you would like to send failure data etc. in the same way, please use the second operation switch IO F1~
You can also use the F8 switch in the same way.

By operating the test output switch in the operation switch 10 in this state, the host computer waits for a transmission invitation from the host computer, and when the transmission to the host computer is completed, the LED rung 9 of the host computer Di test turns off. Various methods can be considered for the transmission procedure between the center device 3 and the host computer 1, one example of which is shown in FIG. In FIG. 3, (al indicates the data formatter sent from the center device 3 to the host computer 1, and the address of the terminal device follows the start signal ENQ, the command indicating the length of data to be transmitted and the type of data. , data, and status (failure) data are set as l sets.If there are several sets of data, the data are arranged using the same M-sample, and finally BCC data for error detection is attached and transmitted. Details of the transmission procedure will be omitted.

As mentioned in 5 above, the data set has a function for only one address, so in the case of the data format in Figure 3, 1al, the data length is changed so that the data length is for one address. Figure 4 shows the transmission timing of BCC and other functions added by the transmission control function built into the micro combinator. Center equipment fi
If ii3 is set to the test state, there is a possibility that data unrelated to the terminal device will be sent to the host computer l, so the Di test S
When w is turned ON, the host computer is notified of the test state as shown in (2)#. In this test state, the center device 3 creates terminal data without permission, creates and sends status data, or forcibly manipulates the terminal output, so this influence can lead to bad results. It is necessary to activate a function that protects the host computer 1 to prevent this from occurring. To do this, after performing the test output 5w1cONlζ (as shown in 31),
The configuration is such that data is transmitted to the host computer. By doing so, it becomes possible to transmit terminal data and status data to the host computer 1 regardless of the status of the terminal. In this way, even in the test state, the same data as normal transmission data is sent, so it is useful for verifying and checking the operation of the host computer! I can go out.

In addition, when the host computer connects the center device and transmits the operation output to the terminal, it is transmitted in a data format as shown in Figure 3 (bl). , When this abnormality was discovered in the output data of the terminal device, there was an abnormality in the transmission data of the upper order nb!1x, resulting in s4P/J in the output data of the terminal device, or the center device It is extremely important for actual system operation to be able to easily distinguish whether an abnormality has occurred during transmission between 3 and the terminal device, or whether there is an abnormality in the terminal itself. If data transmitted from the host computer 1 to the center device 3, which is difficult to judge, can be displayed on the center device, the practical effect would be very useful.

The transmission format from the host computer 1 to the center device is shown in No. 31511b+, but since the display function of the center device shown in FIG.
If the last received address and data are displayed on the display 8 and the LED lamp 9 from among the data for the multiple terminal addresses sent in Figure 1b+, it will be possible to see what kind of data was sent from the host computer l. Visual confirmation is possible. In addition,
This function does not particularly change the device data! Glue for displaying output data to the terminal device in Figure 2.

In cases where the data display Sw is set to ONI, the operation can always be displayed.

Also, the last data received is displayed as the data to be displayed, but - when communicating with Jun's Pro, the first data can be displayed, so it is possible to There is no particular rule as to whether data should be displayed or not, and it may be determined by the knot of the microcombinator of the center device.

〔Effect of the invention〕

According to this invention, the Nanatsuta device transmits data (digital or analog, but may be digital or analog, but at a predetermined address) and status data including failure information to the host computer, regardless of terminal data. In addition, by having the function of displaying terminal operation data sent from the host computer, it has a test function related to transmission control between the host computer and the center device, and can easily discover abnormal conditions. The functions of the computer can be tested from the center device side in line 5.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the data transmission system according to the present invention, Fig. 2 is a schematic diagram of the display section of the center device, and Fig. 3 is an example of the data transmission system between the host computer and the center device. The figure shown in FIG. 4 is an explanatory diagram showing the timing at the time of test operation. 1... Total of X machines, 2... Transmission line, 3... Center device. 4... Signal path, 5-1 to 5-n... Terminal device, 6.
...Digital signal input source, 7.. Analog signal input source, 8.. Display 3.9.-LED lamp, 10.. Switch. Sai Z mouth 1

Claims (1)

[Claims] 1) In a general-purpose data transmission system consisting of a center device that controls transmission, a plurality of terminals connected to the center device via a transmission path, and a host computer connected to the center device via a data transmission path, the center device The device includes a test switch for switching data communication between the center device and the host computer to a test state, a means for setting test data, a means for setting an address of a terminal device, a means for displaying an address of the terminal device, and a communication switch. At least a means for displaying the data, a means for transmitting test data set in place of the terminal data to the host computer when the test state is switched to the test state by the test switch, and a means for transmitting the test data set in place of the terminal data to the host computer, and the host computer receiving the data 1. A data transmission system comprising one or both of a means for displaying communication data from a computer to a terminal.