Mitsubishi FX3U-232-BD User Manual page 497

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
3. When the control line is in the modem mode
RS2
instruction
OFF
driving
SD (TXD)
Send data
Sending
OFF
request
M8402
ER (DTR) OFF
RD (RXD)
Receive data
Receiving
complete
M8403
DR (DSR) OFF
ON
Message
1
ON
ON
Message 2
OFF
ON
Reset it in a sequence program.
While it remains ON, the PLC cannot receive the next set of data.
8 Creating Programs (RS2 Instruction)
Message 4
Message 3
ON
8.3 Operation of Control Line
ON
F-59
A
B
C
D
E
F
G
H
I
Apx.