Name: Shihlin electric SPM-3
Brand: Shihlin electric
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_________________________Shihlin Electric SPM-3 User Guide__________________

5.6 Modbus Function Code

The function code of a Modbus message defines the action to be taken by the slave.

Function code use by SPM-3 is described below:

Code Modbus name Description

03 Read Holding Registers Read the content of read/write location ( 4X reference )

04 Read Input Registers Read the contents of read only location ( 3X reference )

16 Pre-set Multiple

Registers

Set the contents of read/write location ( 4X reference )

Note: The maximum registers of Function 03 & Function 04 is 125

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Shihlin electric SPM-3 Specifications

General