992
Serial Communications Instructions Section 3-24
Controlling Signals
Related PLC Setup Settings
CX-Programmer Settings for the CPU Unit’s Built-in RS-232C Port
TXD
D00300
D00400
00001
S
C
&0N
0 0 03
15 8 71112 340
C: D00400
0
15
1314 12
S: D00300
Turns OFF ER signal.
001
Turns ON RS signal.
Alwa
s #0.
Serial Port Specifier
#0: CPU Unit's built-in RS-232C port
RS and ER Signal Control
#3:
RS and ER signal control
Byte Order
#0:
Most significant bytes first
When CIO 00001 turns ON, the
status of bit 15 of D00300 is
output as the RS signal and the
status of bit 14 is output as the
ER signal.
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