© 2011 Cypress Solutions MODBUS Operation (Revision 1.3)
Contents
Revision Control .............................................................................................................................................. 2
1 CTM-200 MODBUS Operation ................................................................................................................ 2
2 MODBUS Self Slave ................................................................................................................................. 3
3 MODBUS Master Gateway ...................................................................................................................... 4
3.1 MODBUS Serial Master Gateway Configuration ............................................................................. 4
4 MODBUS Slave Gateway ......................................................................................................................... 5
4.1 MODBUS Serial Master Gateway Configuration ............................................................................. 5
5 MODBUS Master ..................................................................................................................................... 5
6 Technical Support/Warranty: ................................................................................................................. 6
Revision Control
Customer Release
Updated Documentation for CTM-200
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 four types of MODBUS devices:
MODBUS Self Slave (section 2)
MODBUS Master Gateway (section 3)
MODBUS Slave Gateway (section 4)
MODBUS Master (section 5)
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
messages can be configured to be sent as MODBUS RTU messages encapsulated in UDP packets, or as
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