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Appendix C: Modbus Protocol
Appendix C: Modbus Protocol
The Modbus Protocol provides client/server communication between devices connected
on different types of buses or networks. Modbus is capable to run full-duplex RS232 lines,
and Ethernet & TCP/IP solutions. The Internet community is able to access MODBUS at a
reserved system port 502 on the TCP/IP stack.
◆ ◆ ◆ ◆
Modbus/TCP to Modbus/RT
The ET-6000 controller can be used as a single Modbus/TCP to multi-Modbus/RTU
converter simply by configuring the device and then setting connection between SCADA,
HMI software and the ET-6000 module.
Internet
◆ ◆ ◆ ◆
Modbus/RTU protocol using the VxComm technique (
In combination with the VxComm technique, the ET-6000 controller is also able to link to
serial devices supported by the Modbus/RTU without changing the original Modbus/RTU
program on the host PC.
ET-6000 User's Manual, 2007, Sep., V1.1,
U protocol converter
Multi Modbus/TCP Masters
Modbus/TCP
command protocol
Modbus/RTU
protocol
RS-232
unavailable)
6PH-002-11----------156
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