JPS6256046A - Method for testing communication control equipment - Google Patents

Abstract

PURPOSE:To test a communication control device without intermitting communication by connecting the reception side and the transmission side of one communication control device so as to allow an opposite device to receive a data sent from its own device and receiving the data by its own device and comparing the transmission data. CONSTITUTION:A master device A sends a signal to a slave device B at the test of the master set A, a level '1' is outputted from a loopback terminal L to close a gate 3a. Since the loopback terminal L of the slave device B is in the reception state, a level '0' is outputted. Then the output data sent from a transmission terminal T of the master device A reaches a reception terminal R of the slave device B via an amplifier 2a, a loop 1, a gate 4b of the slave device B and a OR circuit 5b and is received by a reception terminal of the own device A via gates 3a, 5a of the own device A. The test is conducted in the own device A by comparing whether the reception data is coincident with the transmission data or not. Thus, the communication control device is tested without intermitting the communication.

Description

[Detailed Description of the Invention] [Summary] By connecting the receiving side and the transmitting side of one communication control device, data transmitted by the own device is received by the opposite device, and is also received by the own device, and transmitted. By comparing the data, it is possible to test the communication control device without interrupting the communication operation.

[Industrial application field]

The present invention relates to a method for testing communication control devices, and more specifically, to a method for testing a plurality of communication control devices connected in a loop with a simple configuration and without interrupting communication operations.

[Conventional technology]

In the normal communication operation between multiple communication control devices connected in a loop with the opposing device, it is difficult to test the communication control devices during the communication, so conventionally the communication control devices were temporarily taken offline. After interrupting communication, we conducted tests such as loopback tests. After the test, the communication device that was tested was brought back online and communications resumed.

[Problem that the invention seeks to solve]

Conventional testing methods have the problem of having to go offline for testing, which requires interrupting communication every time a test is performed.

The present invention was created in view of these points, and provides a method for testing a communication control device while online (during normal communication) without interrupting normal communication with a simple configuration. It is intended to.

[Means for solving problems]

Conventionally, in a plurality of communication control devices connected to a loop-shaped bus, each communication control device is provided with a gate to prevent transmitted data from returning to the receiving side.

In the present invention, the above-mentioned gate is removed, and data sent by one device is received by the other device, and
It is configured to test the own device by making the signals received by the own device and comparing them.

[For production]

By comparing the transmitted data and received data of the own device, the communication control device can be tested without interrupting the communication operation.

〔Example〕

The figure shows an embodiment of the present invention, and only two communication control devices, A and B, connected to a loop-shaped bus 1 are shown. Needless to say, the number is not limited to two. In the figure, it is assumed that A operates as a parent device and B operates as a child device.

Each device includes an amplifier 2a (2b) and an AND circuit 3a (3b).
4a (4b) and an OR circuit 5b (5b) are provided. In each device, T is the transmitting terminal,
R is a receiving terminal and L is a loopback terminal. Loopback terminal L of parent device A is “1” when transmitting.
° is output to make the gate 1-3a conductive and the gate 4a cut off.

When testing the parent device A, the parent device A sends a signal to the child device B, outputs "1" from the loopback terminal L, and closes the gate 3a. Note that the loopback terminal L of the child device B is in the receiving state, so it outputs "0". Then, the output data transmitted from the transmission terminal T of the parent device A is sent to the amplifier 2a, the loop 1. It reaches the receiving terminal R of the slave device B via the gate 4b of the slave device B and the OR circuit 5b, and the gate 3a of the self-equipped ffA.
It is also received by the reception terminal of own device A via 5a.

In own device A, a test can be performed by comparing whether the received data matches the transmitted data.

〔Effect of the invention〕

As described above, according to the present invention, a communication control device can be tested with an extremely simple configuration without interrupting communication operations, and is extremely useful in practice.

[Brief explanation of drawings]

The figure is a circuit explaining the invention in detail. 1...Loop-shaped bus, 2a, 2b...Amplifier, 3a
, 3b, 4a, 4b-gate circuit, 5a, 5b...OR circuit, A, B...communication control device, T...transmission terminal, L.../L/-7" back terminal, R ...Receiving terminal.

Claims (1)

[Claims] In a test method for multiple communication control devices connected in a loop, by connecting the receiving side and the transmitting side of one communication control device, the transmitted data of the own device is received by the opposite device, and the data transmitted by the own device is A method for testing a communication control device, characterized in that the communication control device can be tested without interrupting communication operation by comparing transmitted data and received data.