Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

93
Instruction Functions Section 2-2
2-2-23 Network Instructions
RECEIVE VIA
SERIAL COMMU-
NICATIONS UNIT
RXDU
@RXDU
255
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
the allocated DM Setup Area.
Output
Required
1013
CHANGE SERIAL
PORT SETUP
STUP
@STUP
237
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
changed during PLC operation.
Output
Required
1021
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
Page
NETWORK SEND
SEND
@SEND
090
Output
Required
1044
NETWORK
RECEIVE
RECV
@RECV
098
Output
Required
1050
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
Page
RXDU(255)
D
C
N
D: 1st destination
word
C: 1st control
word
N: Number of
bytes to store
0000 to 0256 BCD
STUP(237)
C
S
C: Control word
(port)
S: First source
word
SEND(090)
S
D
C
S: 1st source
word
D: 1st destination
word
C: 1st control
word
D
15
0
n
S
15
0
Local node
Destination node
n: No.
of send
words
Transmits data to a node in the network.
RECV(098)
S
D
C
S: 1st source
word
D: 1st destination
word
C: 1st control
word
D
15
0
15
0
S
m
n
Source nodeLocal node
Requests data to be transmitted from a node in the network and
receives the data.