APPENDIX. HOST COMMUNICATION PROTOCOL
IMR02E20-E1
133
Diagnostics (Loopback test) [08H]
The master’s query message will be returned as the response message from the slave (SRZ unit).
This function checks the communication system between the master and slave (SRZ unit).
Example: Loopback test for slave address 1
Query message
Slave address
01H
Function code
08H
Test code
High
00H
Low
00H
Data
High
1FH
Low
34H
CRC-16
High
E9H
Low
ECH
Normal response message
Slave address
01H
Function code
08H
Test code
High
00H
Low
00H
Data
High
1FH
Low
34H
CRC-16
High
E9H
Low
ECH
Error response message
Slave address
01H
80H + Function code
88H
Error code
03H
CRC-16
High
06H
Low
01H
Contents will be the same as query message data.
Test code must be set to 00.
Any pertinent data
