F-60
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
4. When the control line is in the interlink mode
*1. On the external equipment side, set the DR (DSR) signal to ON when the external equipment is ready
to receive.
The FX
3U/FX3UC PLC sends the send data when both the DR (DSR) signal and the sending request
turn ON.
*2. In the interlink mode, the PLC sets the ER (DTR) signal to OFF 30 characters before reaching the
specified amount of received data, and asks the external equipment to stop sending. After that, the
PLC can only receive up to 30 characters. In this case, temporarily stop sending, and then send the
remaining data after the ER (DTR) signal turns ON again.
When sending is stopped, the PLC finishes receiving after the time-out time setting is reached.
When sending is not stopped, the PLC finishes receiving after it has received the final send data or 30
characters. Accordingly, make sure that the number of receive characters are "30 + α".
OFF ON
OFFON
OFF ON
OFF ON ON ON
Reset it in a sequence program.
While it remains ON, the PLC cannot receive the next set of data.
OFFON
Message
2
Message
4
Message
4
Message
1
Message 3
Message
3
RS2
instruction
driving
SD (TXD)
Send data
Sending
request
M8402
Receiving
complete
M8403
RD (RXD)
Receive data
DR (DSR)
Time-out
check
flag M8409
ER (DTR)
*1 *1 *1
Time-out
time setting
D8409
×
10 ms
Up to 30 characters can be
received.
*2
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