815
Serial Communications Instructions Section 3-23
3-23-3 TRANSMIT: TXD(236)
Purpose Outputs 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
TXD(236)
S
C
N
S: First source word
C: Control word
N: Number of bytes
0000 to 0100 hex (0 to 256)
Variations Executed Each Cycle for ON Condition TXD(236)
Executed Once for Upward Differentiation @TXD(236)
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
15 8 011 37 412
C
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)
Always 0
Byte order
0 hex: Most significant bytes first
1 hex: Least significant bytes first
RS and ER signal control
0 hex: No RS and ER signal control
1 hex: RS signal control
2 hex: ER signal control
3 hex: RS and ER signal control
Area S C N
CIO Area CIO 0 to CIO 6143
Work Area W0 to W511
Holding Bit Area H0 to H511
Auxiliary Bit Area A0 to A447
A448 to A959
Timer Area T0000 to T4095
Counter Area C0000 to C4095
To Next Page
Loading...
