7-2
Chapter 7. CPL Communication Function
Communication procedure
The communication procedure is as follows.
(1) The host device (master station) sends an instruction message to one C1M
unit (slave station).
(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 response message appropriate for the type of
processing.
(4) The master station receives the response message.
Handling Precautions:
• Sending data using several protocols intermixed (CPL, Modbus/ASCII,
Modbus/RTU, PLC link) to the same RS-485 transmission line is not
allowed.
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