SMC Networks HRSH Series, Operation Manual

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HRX-OM-Q033
Chapter 4 MODBUS communication function
4.8 Explanation of function codes HRSH Series
4-14
4.8.4 Function code
：
23 Reading/writing multiple registers
Register content of assigned points of assigned address is read. Write the
register data from the specified address with specified points simultaneously.

Request message <Normal> (Master to Slave)
Start Slave Address Function Data LRC End
[:] XX XX [1] [7] XX XX [CR] [LF]
Read Address Quantity to Read Write Address Quantity to Write
Hi Lo Hi Lo Hi Lo Hi Lo
XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
Byte Count
Write Data1 Write Data n
Hi Lo Hi Lo
XX XX XX XX XX XX XX XX XX XX

Response message <Normal> (Slave to Master)
Start Slave Address Function Data LRC End
[:] XX XX [1] [7] XX XX [CR] [LF]
Byte Count
Read Data1 Read Data n
Hi Lo Hi Lo
XX XX XX XX XX XX XX XX XX XX