Omron SYSMAC CS Series Instruction & Reference Manual page 842

3. Instructions
 Performing RS and ER signal control
0.01
DTXDU instruction
send ready flag
(Unit No. 0, port 2)
15 14 13 12
S: D300 1 0 0 0
15
C: D400 0
15
C+1: D401 0
808
1519.04
S
C
N
Switches the ER signal to 0
Switches the RS signal to 0
12 11 8 7 4 3 0
0 3 0
Byte order
0: Most significant bytes first
RS and ER signal control
3: RS and ER signal control
Fixed at 00 hex
12 11 8 7 4 3 0
2 1 0
Unit address of Serial Communications Unit
10: 10 hex + Unit No. 0
Serial port number (physical port)
2: Port 2
Fixed at 0 hex
DTXDU When 0.01 is ON, bit 15 of D300 is
applied to the RS signal,
D300
and bit 14 is applied to the ER signal.
D400
&1
CS/CJ/NSJ Series Instructions Reference Manual (W474)