Omron CJ - REFERENCE MANUAL 10-2009 Reference Manual page 140

2. Summary of Instructions
Instruction Symbol/Operand
Mnemonic
Code
TRANSMIT VIA
TXDU(256)
SERIAL COMMU-
NICATIONS UNIT
TXDU
@TXDU
256
S: 1st source word
C: 1st control
word
N: Number of
bytes
0000 to 0256 BCD
RECEIVE VIA
RXDU(255)
SERIAL COMMU-
NICATIONS UNIT
RXDU
@RXDU
255
D: 1st destination
word
C: 1st control
word
N: Number of
bytes to store
0000 to 0256 BCD
DIRECT TRANS-
MIT VIA SERIAL DTXDU(262)
COMMUNICA-
TIONS UNIT
DTXDU
@DTXDU
262
This instruction is
S: 1st source word
supported only by
C: 1st control
CJ2H CPU Units.
word
N: Number of
bytes to store
0000 to 0256 BCD
DIRECT
DRXDU(261)
RECEIVE VIA
SERIAL COMMU-
NICATIONS UNIT
DRXDU
@DRXDU
261
This instruction is
D: 1st destination
supported only by
word
CJ2H CPU Units.
C: 1st control
word
N: Number of
bytes to store
0000 to 0256 BCD
CHANGE SERIAL
STUP(237)
PORT SETUP
STUP
@STUP
237
C: Control word
(port)
S: First source
word
102
Outputs the specified number of bytes of data from the serial port of a
Serial Communications Unit (version 1.2 or later). The data is output in
no-protocol mode with the start code and end code (if any) specified in
S
the allocated DM Setup Area.
C
N
Reads the specified number of bytes of data from the serial port of a
Serial Communications Unit (version 1.2 or later). The data is read in
no-protocol mode with the start code and end code (if any) specified in
D
the allocated DM Setup Area.
C
N
Outputs the specified number of bytes of data from the serial port of a
CJ1W-SCU22/SCU32/SCU42 Serial Communications Unit. The data is
output in no-protocol mode from the specified first word with the start
S
code and end code (if any) specified in the allocated DM Setup Area.
This instruction sends the data to the Serial Communications Unit as
C
soon as the instruction is executed to achieve high-speed data trans-
mission.
N
Reads the specified number of bytes of data from the serial port of a
CJ1W-SCU22/SCU32/SCU42 Serial Communications Unit to CPU
Unit memory starting at the specified first word. The data is read in no-
D
protocol mode with the start code and end code (if any) specified in the
allocated DM Setup Area.
C
This instruction reads the data from the Serial Communications Unit as
soon as the instruction is executed to achieve high-speed data recep-
N
tion.
Changes the communications parameters of a serial port on the CPU
Unit, Serial Communications Unit (CPU Bus Unit), or Serial Communi-
cations Board. STUP(237) thus enables the protocol mode to be
C
changed during PLC operation.
S
Function
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Location Page
Execution
condition
Output 836
Required
Output 842
Required
Output 849
Required
Output 854
Required
Output 862
Required