820
Serial Communications Instructions Section 3-23
3-23-4 RECEIVE: RXD(235)
Purpose Reads the specified number of bytes of data from a serial port on a Serial
Communications Option Board mounted to the CPU Unit.
Ladder Symbol
Variations
Applicable Program Areas
Operands The contents of the control word, C, is as shown below.
Note 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
Operand Specifications
RXD(235)
D
C
N
D: First destination word
C: Control word
N: Number of bytes to store
0000 to 0100 hex (0 to 256 decimal)
Variations Executed Each Cycle for ON Condition RXD(235)
Executed Once for Upward Differentiation @RXD(235)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
C
8
12
34
15
07
11
Byte order
0 Hex: Most significant byte to least significant byt
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.
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)
Area DCN
CIO Area CIO 0 to CIO 6143
Work Area W0 to W511
Holding Bit Area H0 to H511
Auxiliary Bit Area A448 to A959 A0 to A447
A448 to A959
Timer Area T0000 to T4095
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