Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 853

Serial Communications Instructions
3-23-4 RECEIVE: RXD(235)
Purpose
Ladder Symbol
Variations
Applicable Program Areas
Operands
Note
Operand Specifications
820
Reads the specified number of bytes of data from a serial port on a Serial
Communications Option Board mounted to the CPU Unit.
RXD(235)
D
C
N
Variations Executed Each Cycle for ON Condition
Executed Once for Upward Differentiation
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Block program areas Step program areas
OK OK
The contents of the control word, C, is as shown below.
15 12 11 8 7
C
Always 0
Serial port specifier (See note.)
1 hex: Serial port 1 (on Serial Communications
Option Board in option slot 1)
2 hex: Serial port 2 (on Serial Communications
Option Board in option slot 2)
In CP1H and CP1L M (30 or 40 I/O points) CPU Units:
1 hex: Port 1
2 or 0 hex: Port 2
In CP1L L (14 or 20 I/O points) CPU Units:
1 or 0 hex: Port 1
Area
CIO Area
Work Area
Holding Bit Area
Auxiliary Bit Area
Timer Area
D: First destination word
C: Control word
N: Number of bytes to store
0000 to 0100 hex (0 to 256 decimal)
Subroutines
OK
4 3 0
Byte order
0 Hex: Most significant byte to least significant byte
1 Hex: Lest significant byte to most significant byte
CS and DR signal monitoring
0 hex: No CS and DR signal monitoring
1 hex: CS signal monitoring
2 hex: DR signal monitoring
3 hex: CS and DR signal monitoring.
D
CIO 0 to CIO 6143
W0 to W511
H0 to H511
A448 to A959 A0 to A447
A448 to A959
T0000 to T4095
Section 3-23
RXD(235)
@RXD(235)
Not supported.
Interrupt tasks
OK
C N