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SAMWONTECH
1st Edition of TEMI2000_Series IM : Dec. 15. 2008 Page 22 / 58
6.5 Function code - 08
Function code-08 is used to test loopback for self-diagnosis.
▣
Request Message Frame
Factor
ASCII
RTU
Protocol Header
:(Colon)
-
Slave Address
2 characters
8-Bit
Function code-08
2 characters
8-Bit
Diagnosis code Hi
2 characters
8-Bit
Diagnosis code Lo
2 characters
8-Bit
Data Hi
2 characters
8-Bit
Data Lo
2 characters
8-Bit
Error detecting
2 characters
16-Bit
Protocol Tail
2 characters (CR+LF)
-
◈
Example
Request message to test loopback for self-diagnosis should be
- MODBUS ASCII
:010800000002F5[cr][lf]
- MODBUS RTU
01080000000261CA
▣
Response Message Frame
Factor
ASCII
RTU
Protocol Header
:(Colon)
-
Slave Address
2 characters
8-Bit
Function code-08
2 characters
8-Bit
Diagnosis code Hi
2 characters
8-Bit
Diagnosis code Lo
2 characters
8-Bit
Data Hi
2 characters
8-Bit
Data Lo
2 characters
8-Bit
Error detecting
2 characters
16-Bit
Protocol Tail
2 characters (CR+LF)
-
◈
Example
Without any trouble, response message will be
- MODBUS ASCII
:010800000002F5[cr][lf]
- MODBUS RTU
01080000000261CA