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FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
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
OFF
driving
RD (RXD)
Receive data
ER (DTR)
OFF
Receiving
complete
M8403
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
OFF ON
Message
1
OFF
ON
OFF
ON
OFF
ON
ON
ON
OFF
ON
Message
1
ON
ON
Message 2
OFF
ON
Message
1
Message
1
ON
Reset it in a sequence program.
While it remains ON, the PLC cannot receive the next set of data.
Message 4
Message 3
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
Message
2
Message
2
ON
ON
A
B
C
D
E
F
G
H
I
Apx.A
F-73
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