ET-2200 Series Ethernet I/O Modules
Copyright © 2016 ICP DAS CO., Ltd. All Rights Reserved.
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6.
Modbus Information
The ET-2200 series is a family of IP-based Modbus I/O devices that allow you to remotely control
DI/DO terminals via an Ethernet connection and uses a master-slave communication technique in
which only one device (the master) can initiate a transaction (called queries), while other devices
(slaves) respond by either supplying the requested data to the master, or by taking the action
requested in the query.
Most SCADA (Supervisory Control and Data Acquisition) and HMI software, such as Citect
(Schneider Electric), ICONICS, iFIX, InduSoft, Intouch, Entivity Studio, Entivity Live, Entivity VLC,
Trace Mode, Wizcon (ElUTIONS), and Wonderware, etc. can be used to easily integrate serial devices
via the Modbus protocol.
Modbus/TCP master applications can also be developed using any programming language, such as
VB, C# and so on.
ICP DAS provides the Modbus SDK that allows development of Modbus applications on a PC.
The relevant demo programs and SDK can be obtained from the following locations:
VB Demo:
http://ftp.icpdas.com/pub/cd/6000cd/napdos/et7000_et7200/demo/pc_client/
.Net demo and SDK:
http://ftp.icpdas.com/pub/cd/8000cd/napdos/modbus/nmodbus/
6.1
What is Modbus TCP/IP?
Modbus is a communication protocol that was developed by Modicon Inc. in 1979, and was
originally designed for use with Modicon controllers. Detailed information regarding the Modbus
The different versions of the Modbus protocol used today include Modbus RTU, which is based on
serial communication interfaces such as RS-485 and RS-232, Modbus ASCII and Modbus TCP, which
uses the Modbus RTU protocol embedded into TCP packets.
Modbus TCP is an internet protocol. The protocol embeds a Modbus frame into a TCP frame so that
a connection oriented approach is obtained, thereby making it more reliable. The master queries
the slave and the slave responds with a reply. The protocol is open and, hence, highly scalable.
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