10. easyE4 communication Connection to other devices
10.16 easy communication modules
The EASY-COM-RTU-… communication module only supports half-duplex com-
munication mode.
Two types of dialog are possible between master and slave:
l
The master sends a request to a slave and waits for a response.
l
The master sends a request to all slaves and does not wait for a response (broad-
cast).
For more information on Modbus communications, please visit
modbus.org and read the following documents:
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MODBUS over serial line specification and implementation guide
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MODBUS application protocol specification
The EASY-COM-RTU-… easy communication module supports Modbus com-
munications with up to 32 slaves.
The length of the bus should not exceed 600 m. Stub lines are not recommended.
Combining an easyE4 control relay and an EASY-COM-RTU-… communication mod-
ule results in up to 224 digital operands (112 inputs, 112 outputs) and up to 88 analog
operands (44 inputs, 44 outputs) that can be assigned.
The EASY-COM-RTU-… communication module is supported by generation 05 and
higher easyE4 base devices when used with firmware 1.40 or higher.
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easyE402/24 MN050009ENEaton.com
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