Mitsubishi FX3U-232-BD - 8.3 Operation of Control Line

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