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4. Modbus and Modbus TCP
Modbus is a serial communication protocol that allows a wide variety of instruments
to be connected to a common data collection network.
Modbus/TCP is a variant of the Modbus communication protocol that allows devices
to communicate over a TCP/IP.
With the support of the Modbus TCP protocol, the OME-ET-7000/OME-PET-7000
series module can communicate with PC-based applications, such as SCADA
(Supervisor Control And Data Acquisition) and HMI programs. The Modbus/TCP
information is only available via an Ethernet interface.
The Modbus/TCP messaging service provides a Client/Server communication
between devices connected on a TCP/IP network. The
OME-ET-7000/OME-PET-7000 module is a Modbus Server, meaning that it is only
capable of responding to requests from the Modbus client device. Note that the
Modbus/RTU protocol requires a serial interface, not Ethernet, and is therefore not
directly compatible with the OME-ET-7000/OME-PET-7000 module.
The Modbus protocol, as well as the TCP extension, is well documented in the
specifications, which are available at http://www.modbus.org, a website established
by the Modbus Organization to provide support and organization for the Modbus
protocol. Only the use of the protocol is documented here.
Summary of Contents for OME-ET-7000 Series
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