6. Serial Communications Settings
6.3. Example of Checking Connection
Example of Checking Connection
This document uses an example of the ladder program and protocol macro data in which the
PLC sends/receives a message to/from the RFID Reader/Writer.
The PLC and RFID Reader/Writer send and receive the message of “Sequence No. 900 (read
product type and version)”. The following figure outlines the operation.
PLC
CPU Unit
Serial Communications Unit
RS-232C RFID Reader/Writer
Project file
Ladder program
PMCR
Send data
Receive data
Sequence No.900
(Reading the type and
version)
Protocol macro data
Sequence No.1
Sequence No.2
Sequence No.900
5501 onwards
Receive data
storage area
Executing the protocol
macro instruction
12
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