Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

92
Instruction Functions Section 2-2
2-2-22 Serial Communications Instructions
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
Page
PROTOCOL
MACRO
PMCR
@PMCR
260
Output
Required
974
TRANSMIT
TXD
@TXD
236
Outputs the specified number of bytes of data from the RS-232C port
built into the CPU Unit or the serial port of a Serial Communications
Board (version 1.2 or later).
Output
Required
983
RECEIVE
RXD
@RXD
235
Reads the specified number of bytes of data from the RS-232C port
built into the CPU Unit or the serial port of a Serial Communications
Board (version 1.2 or later).
Output
Required
993
TRANSMIT VIA
SERIAL COMMU-
NICATIONS UNIT
TXDU
@TXDU
256
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
the allocated DM Setup Area.
Output
Required
1005
PMCR(260)
C1
C2
S
R
C1: Control word 1
C2: Control word 2
S: 1st send word
R: 1st receive word
R
S
to
to
CPU Unit
C
alls and executes a communications sequence registered in a
S
erial
Communications Board (CS Series only) or Serial Communications
Unit.
Serial Communications Unit
Port
External
device
TXD(236)
S
C
N
S: 1st source
word
C: Control word
N: Number of
bytes
0000 to 0100 hex
(0 to 256 decimal)
RXD(235)
D
C
N
D: 1st destination
word
C: Control word
N: Number of
bytes to store
0000 to 0100 hex
(0 to 256 decimal)
TXDU(256)
S
C
N
S: 1st source word
C: 1st control
word
N: Number of
bytes
0000 to 0256 BCD