Omron J7 series, User Manual

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DSR Message and Response
Chapter 7-4
7-4-3 Loop-back Test (Function Code: 08 Hex)
Settings and Response
• The DSR message from the Master is returned as a response. The
Inverter does not retrieve or process this data.
• The DSR message or normal response for loop-back test use is divided
into 8-byte blocks as shown below. Any data can be set as test data 1 or 2
provided that the number of data items remains changed.
• This command is used for checking the status of communications or for
dummy communications without detecting any communications time-over.
DSR Message
Response
Normal
Error
Note When an error occurs, the MSB of the function code will be set to 1.
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3 Test data 1
4
5 Test data 2
6
7 CRC-16 check
8
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3 Test data 1
4
5 Test data 2
6
7 CRC-16 check
8
Byte No. Data
1 Slave address
2 Function code (88 Hex)
3 Error code
4 CRC-16 check
5