YASKAWA iQpump Series Programming Manual page 86

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Loopback Test (08H)
The loopback test returns the command message directly as the response message without changing the contents to check the
communications between the master and slave. Set user-defined test code and data values.
The following table shows a message example when performing a loopback test with the slave 1 Drive.
Command Message
Slave address
Function code
Test Code
Data
CRC-16
86
(During Normal Operation)
01H
08H
High
00H
Byte
Test Code
Low
00H
Byte
High
A5H
Byte
Data
Low
37H
Byte
High
DAH
Byte
CRC-16
Low
8DH
Byte
Figure 83 Function Code 08H Message Example
Response Message
Slave address 01H
Function code 08H
High
00H
Byte
Low
00H
Byte
High
A5H
Byte
Low
37H
Byte
High
DAH
Byte
Low
8DH
Byte
Response Message
(During Error)
Slave address 01H
Function code 88H
Error Code 01H
High
86H
Byte
CRC-16
Low
50H
Byte
YASKAWA TM.iQp.02 iQpump Drive Programming Manual