Omron CP1L-EL20DR-D Operation Manual page 437

Serial Communications
Transfer direction
Data transmission
(PLC → External device)
Data reception
(External device → PLC)
Sending/receiving data
For example, simple (non-protocol) communications can be used to input data
from a barcode reader or output data to a printer.
The following table lists the no-protocol communication functions supported
by CP1L-EL/EM PLCs.
Method Max.
amount
of data
Execution of 256 bytes
TXD(236) in
the program
Execution of 256 bytes
RXD(235) in
the program
CP1L-EL/EM CPU Unit
SYSMAC
CP1L
COM 01 03 05 07 09 11 01 03 05 07 09 11
NC 00 02 04 06 08 10 00 02 04 06 08 10
POWER
RUN
ERR/ALM
INH
LNK/ACT
BKUP
1
2
00 01 02 03 04 06 00 01 03 04 06
ANALOG INPUT
COM(V+) COM 05 07 COM 02 COM 05 07
V1+ V2+ COM
MAC Address:
01234567890A
RS-232C or RS422A/485
Standard device with
serial communications
(e.g., barcode reader)
Frame format
Start code End code
Yes: 00 to FF Yes:
00 to FF or CR+LF
No: None
No: None
(The amount of data to
receive is specified
between 1 and 256 bytes
when no end code is speci-
fied.)
Section 8-3
TXD(236) or RXD(235)
Other functions
• Send delay time
(delay between
TXD(236) execu-
tion and sending
data from specified
port): 0 to 99,990
ms (unit: 10 ms)
• Controlling RS and
ER signals
Monitoring CS and
DR signals
403