Modbus Rtu Protocol Command Set - ICP DAS USA ZT-2017 User Manual

6.3 Modbus RTU Protocol Command set

The Modbus Protocol was developed by Modicon Inc., and was originally
designed for Modicon controllers. Detailed information regarding the
Modbus RTU Protocol can be found at:
http://www.modicon.com
and http://www.modbus.org
 Modbus RTU Command Format
Field
1
Module Function
Address
Function Code
0x04
0x46
Examples:
A. To read the analog input value for module 01, the following command
should be sent:
01 04 00 00 00 08 F1 CC
B. To read the name of the module, the following command should be
sent:
01 46 00 12 60
ICP DAS, ZT-2017 and ZT-2017C AI Series User Manual, Version 1.0.1
Copyright © 2012 by ICP DAS Co., Ltd. All Rights Reserved.
Field Field
2 3
Sub
Code Function
Description
Reads the input channels
Reads/writes the module settings
Field
4~n n+1~n+2
Configuration
CRC16
Field
Field
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