Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 858

Serial Communications Instructions
Examples
0.00
A392.14
Reception
Completed
Flag
This example assumes that both a start and end
code have been specified in the PLC Setup.
ST: Start code (e.g., 02 hex)
ED: End code (e.g., 03 hex)
3-23-5 TRANSMIT VIA SERIAL COMMUNICATIONS UNIT: TXDU(256)
Purpose
Note
Ladder Symbol
Name
Serial Port 1 Restart Bit
Serial Port 2 Restart Bit
When CIO 0.00 and the Serial Port 1 Reception Completed Flag (A392.14) is
ON in the following example, data is received from serial port 1 and 10 bytes
of data are stored starting in D100.
RXD
D D100
C D200
N &10
C: D200
Always 0
Stored
Outputs the specified number of bytes of data from one of the CJ-series Serial
Communications Unit's serial ports.
A CJ Unit Adapter is required to use CJ-series Serial Communications Units.
This instruction can be used in the CP1H CPU Units only. It cannot be used in
the CP1L CPU Units. If TXDU(256) is used in a CP1L CPU Unit, Error Flag
(ER) will be turned ON.
TXDU(256)
S
C
N
Address
A526.01
A526.00
0 1
CS and DR signal monitoring
0: No CS and DR signal monitoring
Serial port specifier
1: Serial port 1 (serial port on Serial Communications
Option Board mounted in option slot 1)
Most signifi-
cant bytes
D: D100
D101
D102
D103
D104
S: First source word
C: First control word
N: Number of bytes
0000 to 0100 hex (0 to 256)
Section 3-23
Contents
Turn this bit ON to restart the serial
port. The Reception Completed Flag
and Reception Overflow Flag will be
turned OFF and the Reception Counter
will be cleared to 0.
This bit is turned OFF automatically
when the restart processing is com-
pleted.
Byte order
1: Least significant bytes first
Least signif-
icant bytes
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