Modbus/TCP & Modbus RTU Function Codes
Function Code 08 - Loopback Message
36 HC900 Process Controller Communications User Guide Revision 13
April 2017
4.9 Function Code 08 - Loopback Message
Description
Echoes received query message.
Query
Message can be any length up to half the length of the data buffer minus 8 bytes.
Example: 00 08 01 02 03 04
Query message format for function code 08
Slave
Address
(00 for TCP)
Any data, length limited to approximately half
the length of the data buffer
Response
Example: 00 08 01 02 03 04
Response message format for function code 08
Slave
Address
(00 for TCP)
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