Panasonic AFP7CPS4E User Manual page 76

MEWTOCOL
Master/Slave Communication
KEY POINTS

Specify the port targeted for communication, using UNITSEL instruction
immediately before SEND/RECV instruction.

Master communication is only valid when MEWTOCOL or MODBUS is
selected. Confirm that the "Master communication Clear to send flag" (XC -
XF) for the targeted channel is ON, and execute SEND/RECV instruction.

You cannot execute other SEND/RECV instruction for a communication port
in master communication. Confirm that the "Master communication Sending
active flag" (YC - YF) is OFF, and execute instruction.

You cannot execute SEND/RECV instruction for a port in slave
communication.

If no response is received, the "Master communication Sending active flag"
(YC - YF) remains ON throughout the timeout setting time specified in CPU
configuration.

Up to 16 SEND/RECV instructions can be executed simultaneously for
different COM. ports.
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