991
Serial Communications Instructions Section 3-24
Set the PLC communications settings to the same values in the PLC Setup.
Only the end code needs to be set.
Programming Example
If CIO 000001 turns ON while the RS-232C Port Send Ready Flag (A39205)
is ON, three bytes of data starting from the upper byte of D00010 are sent
without conversion to the Code Reader connected to the CPU Unit’s built-in
RS-232C port. These three bytes contain “@GL”, which is the normal read
command used as a trigger input to the Code Reader from the RS-232C line.
Data bit length 8 bits
Parity None
Stop bits 1
Start code None
End code #000D (CR)
Item Setting
4 E 00
4 0 35
15 8 71112 340
S: D00010
@TXD
D00010
D00020
00001 A39205
S
C
&3N
RS-232C Port Send
Ready Flag
D00011
@RXD
D00100
D00020
00002 A39206
A393
RS-232C Port Receive
Ready Flag
RS-232C Port
Reception Counter
Always #0.
Serial Port Specifier
#0: CPU Unit's built-in RS-232C port
0 0 00
15 8 71112 340
C: D00020
RS and ER Signal Control
#0:
No RS and ER signal control.
Byte Order
#0:
Most significant bytes first
Three bytes
Lower byte
Upper byte
40 53 4E ED
Sent
@ G L
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