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Modbus RTU Function Codes

20 Modbus® RTU Serial Communications User Manual 02/13

3.6 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.

Query message format for function code 08

Slave

Address

Function

Code

Any data, length limited to approximately half

the length of the data buffer

CRC CRC

Example:

02 08 01 02 03 04 CRC CRC

Response

Response message format for function code 08

Slave

Address

Function

Code

Data bytes received CRC CRC

Example:

02 08 01 02 03 04 CRC CRC

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 75 76

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