© 2011 Cypress Solutions MODBUS Operation (Revision 1.3)
Contents
Contents .......................................................................................................................................................... 2
Revision Control .............................................................................................................................................. 2
1 CTM-200 MODBUS Operation ................................................................................................................ 2
2 MODBUS Configuration Commands ....................................................................................................... 3
2.1 MODBUS Serial Master Gateway Gateway Configuration .............................................................. 3
2.2 MODBUS Slave Gateway Gateway Configuration ........................................................................... 4
3 MODBUS Command Reference .............................................................................................................. 5
3.1 General MODBUS Command Reference ......................................................................................... 5
3.2 MODBUS Serial Master Gateway Command Reference ................................................................. 6
3.3 MODBUS Slave Gateway Command Reference .............................................................................. 8
4 Technical Support/Warranty: ............................................................................................................... 10
Revision Control
Customer Release
Updated Documentation for CTM-200
1 CTM-200 MODBUS Operation
The CTM-200 gateway supports the MODBUS protocol commonly used in SCADA applications. The
gateway can be configured as one of three types of MODBUS devices:
MODBUS slave with its own MODBUS ID
MODBUS serial master gateway
MODBUS slave gateway for a single serial slave and multiple TCP slaves (default configuration)
This application note details how to setup a CTM-200 gateway in MODBUS mode. The MODBUS
connection uses the cellular wireless packet data network so is able to provide the advantages of high
data rates, and being always connected so available for quicker response times. Over-the-air MODBUS
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