Chapter 1 Introduction
1 - 3
1.2 Feature
EH-SIO is the serial communication module with the following features.
2 communication ports
There are two communication ports in EH-SIO. The port 1* and 2 can be used as RS-232C, RS-422 or 485 interface.
Two communication ports can be operated independently and can assign a different function each other.
* The hardware before Rev. 10 supports RS-232C only.
Communication operation by user program
Communication with external device is performed by user program. It is controlled by special command "TRNS 9".
Figure 1.1 System configuration of general-purpose communication
Exclusive protocol is supported.
Modbus protocol is supported by EH-SIO.
Since EH-SIO can be configured as master or slave, application range of EH-150 will be expanded, such as
supervising by host computer or controlling modbus slave.
Figure.1.2 System configuration of Modbus protocol application
The Modbus protocol is a communication protocol developed by Modicon Inc. (AEG Schneider Automation
International S.A.S.). Only the communication protocol is defined as the modbus protocol. And physical layers,
such as a communication medium, are not specified. Please refer to the appendix in the end of this book about a
Modbus protocol outline. Please refer to "Modbus Protocol Reference Guide" (PI-MBUS -300) of Modicon Inc.
issue for further information.
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