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Hitachi EH-150 Series - Chapter 6 Communication Mode; Introduction; Free Protocol Mode

Hitachi EH-150 Series
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Chapter 6 Communication Mode
For EH-SIO, after the initial setting is complete, the communication procedure is then decided. This
communication procedure is called the communication mode. EH-SIO has two communication ports which are
operated independently, therefore a different communication mode can be assigned to each communication port.
This chapter explains the details of each communication mode. Please create a communication program after
carefully reading this chapter and "Chapter 5 Control of EH-SIO."
6.1 Introduction
This paragraph explains the basic operation of EH-SIO. Please refer to the next paragraph for a detailed explanation of
the communication mode.
Basic operation of EH-SIO
Operation of EH-SIO is shown in the following figure.
Figure 6.1 Basic operation of EH-SIO
EH-SIO
CPU module
Power ON
RUN
TRNS 9
(Initial setting)
Communication mode configured
TRNS 9
(Data send)
Data sending
TRNS 9
(Data receive)
Data receiving
TRNS 9
(Query send)
Query sending
Response receiving
Processing of the CPU module & EH-SIO
(User program unnecessary)
Free protocol mode
Modbus (Master) mode
Modbus (Slave) mode
STOP
Waiting for initial setting
Waiting for initial setting
Processing of the CPU module & EH-SIO
(User program unnecessary)
Hi-Protocol mode
(Supported by software ver. 2.0
or newer)
Processing of the CPU module & EH-SIO
(User program unnecessary)
Simple data link mode
(Supported by software ver. 2.0
or newer)

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