Download FX COMMUNICATION (RS-232C, RS-485, RS

RS instruction 9
FX communication
4 ) Use normal mode 2 of control line (FX, FX2C only)
RS instruction
driving
OFF ON
Send data
SD (TXD)
Send request
M8122
Data 1
OFF
ON
Send wait
flag M8121
ER(DTR)
Data 3
ON
Check OFF
OFF
ON
*2
DR(DSR)
ON
OFF
Check
OFF
Receive data
RD (RXD)
Receive
completion
M8123
*1
*1
*5
*3
Data 2
OFF
ON
*4
*1 Please turn OFF ER (DTR) of DR (DSR) later.
*2 When the data is sent, please turn OFF DR (DSR). When it is turned ON, the next data cannot
be communicated.
*3 When sending data to the programmable controller, please check to turn OFF the ER (DTR)
signal.
*4 Reset using a program. When it is turned ON, the next data cannot be received.
*5 This period should be longer than 2 scan times or more.
9
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