Mitsubishi FX3U-232-BD User Manual page 496

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
8.3 Operation of Control Line
1. When the control line is not provided
RS2
instruction
OFF ON
driving
SD (TXD)
Send data
Sending
request
M8402
RD (RXD)
Receive data
Receiving
complete
M8403
2. When the control line is in the standard mode
Use this mode when only sending or receiving.
1) When only sending is executed
RS2
instruction
driving
SD (TXD)
Send data
Sending
request
M8402
ER (DTR)
DR (DSR)
2) When only receiving is executed [The DR (DSR) signal is not used.]
RS2
instruction
driving
RD (RXD)
Receive data
ER (DTR)
Receiving
complete
M8403
F-58
Message
1
OFF ON
Message
2
OFF
Receiving wait status
is started.
OFF ON
Message
1
OFF ON
OFF
OFF ON
OFF ON
OFF ON
OFF
Message Message
3
Message 4
ON
Reset it in a sequence program.
While it remains ON, the PLC cannot receive the next
set of data.
Message
1
ON
Message
1
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)
8.3 Operation of Control Line
5
ON
Message
2
Message
2
ON