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Communication procedures
The communication procedure is as follows:
(1) The instruction message is sent from the host device (master station) to one
unit (slave station) to communicate with.
(2) The slave station receives the instruction message, and performs read or write
processing according to the content of the message.
(3) The slave station sends a message corresponding to the processing content as a
response message.
(4) The master station receives the response message.
Handling Precautions
It is not allowed to use two or more number of protocols together on a
single RS-485 transmission line such as CPL, MODBUS ASCII format,
and MODBUS RTU format.
8-2
Chapter 8. MODBUS COMMUNICATION FUNCTION
Summary of Contents for SDC35
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