Chapter 7 System setup
7 - 6
Check flow of Modbus master mode
Reference :
In case of the Modbus RTU, H80 - HFF are contained in data. If 7-bit transmission format configuration is used, CRC
error will be detected, and a response will not return from slave device. Be sure to use 8-bit transmission code
configuration.
Query transmission
Response
received?
Replace the module.
YES
NO
Transmission speed
OK?
YES
YES
YES
Status of slave device
normal?
Sending data
(Query) OK?
YES
NO
OK
Please set up a communication
setting switch again.
NO
Please set up a communication
setting switch again.
NO
Please connect a communication
cable correctly.
NO
Please change the slave device to
a normal state.
NO
Exception
response?
YES
NO
Please improve the contents of
sending data (query).
Please improve the designated
address by query.
Device No.
agreement?
YES
NO
Please improve the device No.
of query.
Broadcast
transmission?
NO
YES
OK
Transmission format
configuration OK?
Connection of
communication cable
OK?
Содержание EH-150 Series
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