JPS6297444A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To prevent crosstalk by allowing a data transmission equipment inserted between each processor and a data transmission line while being added with an equipment address to generate an equipment address check command and comparing the command with a received equipment address command. CONSTITUTION:Processors 1-4 are connected to a data transmission line 9 via data transmission equipments 5-8. The data transmission equipments 5-8 receive a signal from the processors 1-4 to analyze a command and to produce an equipment address check command, which is sent to the transmission line 9 together with an equipment address. Further, the data transmission equipments 5-8 receive a signal from the data transmission line 9 to analyze the command and when the address addressed to the own station is included, the message is sent to the processors 1-4 of the own station and when the address addressed to other station is included, an equipment address is added and the result is sent to the data transmission line 9. Thus, the presence of a data transmission equipment having the same equipment address as the own station equipment address is confirmed to prevent communication with an erroneous destination.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a management means for a data transmission device used in an inter-processor network I/work system.

〔overview〕

The present invention provides a data transmission device in which a processor is coupled to a data transmission path and is connected to another device based on a device address assigned to the device itself.During a test, the device address of the other device is added (=J By sending a device address check command and comparing the contents of this command with the device address of the own device, it is possible to prevent the device address from being mistakenly assigned to the same address as the device address of another device. This is what I did.

[Conventional technology]

When one or more data transmission devices with the same device address are connected to the conventional data transmission device on the data transmission path of the inter-processor network system,
There is no way to determine this.

[Problem that the invention seeks to solve]

In such a data transmission device, when there is a data transmission device with the same device address on the data transmission path 2, even if the data transmission is not originally addressed to the local station, the data transmission device automatically sends data because the device addresses match. It is determined that the data is addressed to the station,
There was a drawback that a response indicating that it had been received was sent back to the sender by mistake.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and provides a data transmission device having means for detecting data transmission devices having the same device address.

Means for Solving Problem c] The present invention generates a device address check command in a data transmission device inserted on a path connecting each of a plurality of processors and a data transmission path and assigned a device address. an address adding means (509) for adding the device address of the own device to the received device address command when the received device address command has not circulated through all the other devices; The apparatus is characterized by comprising a determining means (507) for comparing and determining the apparatus address added to the apparatus address command and the apparatus address of the own apparatus when the apparatus address command is making a round of all other apparatuses. shall be.

[Effect]

During testing, a device address check command is sent to the transmission path from the command generation means. The other device that receives this adds the device address assigned to this device to the device address check command and sends it to the transmission path. The device command of the other device added to the device address check command received after visiting all other devices is compared with the device command of the own device. If the device commands match, for example, by changing the device command of the own device, communication confusion can be prevented.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be explained below based on the drawings.

FIG. 2 is a block configuration diagram showing the configuration of a data transmission system in which the device according to the embodiment of the present invention is used.
Reference numeral 4 indicates a processor, reference numerals 5 to 8 indicate data transmission devices, and reference numeral 9 indicates a data transmission path.

First, the configuration of an apparatus according to an embodiment of the present invention will be explained based on FIG. This embodiment device 5 has a signal line 51 for outputting data from the processor 1, a processor receiving circuit 501 for inputting data on the signal line 51, and a device address check for input data input from the processor receiving circuit 501. A command analysis circuit 502 that analyzes whether or not it is a command generation instruction; a signal line 53 that instructs generation of a device address check command if the command analysis of the command analysis circuit 502 indicates an instruction to generate a device address check command; and a signal line 53 that instructs generation of a device address check command; A device address check command generation circuit 503 that generates a device address check command if the state of the signal line 53 instructing the generation of is 11'', a command analysis circuit 502, a device address check command generation circuit 503, or a device address addition circuit. 509 to the data transmission path 9, a signal line 91 for carrying the output data of the data transmission line transmission circuit 504, and a signal line 92 for carrying the input data from the data transmission line 9. , a data transmission path receiving circuit 50 that inputs data on the signal line 92.
5, a command analysis circuit 506 that analyzes whether the input data from the data transmission line receiving circuit 505 is a device address check command, and a command analysis circuit 506 that analyzes whether the input data from the data transmission line receiving circuit 505 is a device address check command, and a command analysis circuit 506 that analyzes whether the command analysis result is a device address check command and its own circuit waits for a response to the device address check command. Otherwise, the signal line 54 carries the output of the command analysis circuit 506, and the command analysis circuit 50 if the command analysis result is a device address check command and the own circuit is waiting for a response to the device address check command.
6, a signal line 56 that carries the output of the command analysis circuit 506 when the command analysis result is other than a device address check command, and a signal line 56 that carries the output of the command analysis circuit 506, and the own station address is added to the input data from the signal line 54. The device address adding circuit 509 that sends data to the data transmission path transmitting circuit 504, the signal line 55, and the device address information of the input data from the local device address 510 match the local device address. A device address information determination circuit 507 that determines the
The processor transmission circuit 508 is provided with a processor transmission circuit 508 for transmitting data to the processor transmission circuit 508, and a signal line 52 for carrying output data of the processor transmission circuit 508.

Next, the operation of the apparatus according to the embodiment of the present invention will be explained based on FIG.

First, the operation of issuing a device address check command will be explained. The device address check command instruction from the processor 1 is sent to the processor receiving circuit 50 via the signal line 51.
1, this command is output from the processor reception circuit 501 to the command analysis circuit 502, and when the command analysis circuit 502 analyzes that the input data is a device address check command instruction, the signal line 53 becomes "1". On the other hand, if the device address check command is not specified, the signal line 53 is set to "0". If the signal line 53 is "1" in the device address check command generation circuit 503, data of the device address check command in Shingetsu Dake format shown in FIG. 3 is generated. When a request to send device address check command data is output from the device address check command generation circuit 503 to the data transmission path transmission circuit 504, the data transmission path transmission circuit 50
4, a device address check command is sent to the signal line 91. After this series of transmission operations is completed, the station enters a state of waiting for a response from another station.

Next, the reception operation will be explained. When input data from the data transmission line 9 is received by the data transmission line receiving circuit 505 via the signal line 92, the data transmission line receiving circuit 505
This input data is sent to the command analysis circuit 506. If the command analysis circuit 506 analyzes that the command of this input data is a device address check command and that a response to the device address check command is awaited, the signal on the signal line 55 is set to the "1" state. If the device is not waiting for a response to the device address check command, the signal on the signal line 54 is set to the "1" state. Also, if the input data command is not a device address check command,
The signal is output to processor transmission circuit 508.

If the signal line 54 is rlJ, the device address addition circuit 5
From 09, data in which the output of the local device address 510 is added to the device address information part of the input data is output to the data transmission path transmitting circuit 504. This manually generated data is sent from the data transmission line transmission circuit 504 to the signal line 91. On the other hand, in the device address information determination circuit 507, if the signal line 55 is in the "1" state, it is compared to see if there is a device address that is the same as the local device address 510 in the device address information section of the input data. The matched device address is replaced with an invalid address code, and the determination result is reflected in the status information section of the input data. The input data for which the determination has been completed is output to the processor transmission circuit 508, and the input data is sent from the processor transmission circuit 508 to the signal line 52. Reception is completed with this series of operations.

〔Effect of the invention〕

As explained above, the present invention allows a data transmission device to check whether there is a data transmission device having the same device address as its own device address. This has the effect of preventing communications with different destinations.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a block configuration diagram showing the configuration of a network system between multiple processors in which a device according to an embodiment of the present invention is used. FIG. 3 is a frame configuration diagram showing the format of data used for transmission and reception operations by the device according to the embodiment of the present invention. 1-4... Processor, 5-8... Data transmission device, 9... Data transmission path, 51-56.91.92...
- Signal line, 501... Processor receiving circuit, 502.
506... Command analysis circuit, 503... Device address processing command generation circuit, 504... Data transmission line transmitting circuit, 505... Data transmission line receiving circuit, 5
07... Device address information determination circuit, 508... Processor transmission circuit, 509... Device address addition circuit, 510... Local device address.

Claims (1)

[Scope of Claims] 1) In a data transmission device inserted on a path connecting each of a plurality of processors and a data transmission path and assigned a device address, a command generation means (503) for generating a device address check command. ), and address addition means (509) for adding the device address of the own device to the received device address command when the device address command has not circulated through all other devices.
and determining means (507) for comparing and determining the device address added to the received device address command with the device address of the own device while the received device address command is making a round of all other devices. A data transmission device characterized by: