© 2011 Cypress Solutions MODBUS Operation (Revision 1.3)
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Contents
Contents .......................................................................................................................................................... 2
Revision Control .............................................................................................................................................. 2
1 CTM-15X MODBUS Operation ................................................................................................................ 2
2 MODBUS Configuration Commands ....................................................................................................... 3
2.1 MODBUS Serial Master Gateway Modem Configuration ............................................................... 3
2.2 MODBUS Slave Gateway Modem 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 .............................................................................. 7
4 Technical Support/Warranty: ............................................................................................................... 10
Revision Control
Description Revision Date
Customer Release revision 1.0
2009
Updated documentation 1.1 05-25-09
Updated to include new modbusadd syntax for
serial slave devices
1.3 02-28-11
1 CTM-15X MODBUS Operation
The CTM-15X firmware version R1.2.0 and above support the MODBUS protocol commonly used in
SCADA applications. The modem 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-15X CDMA wireless data modem in MODBUS mode. The
MODBUS connection uses the CDMA/GPRS 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
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