1006
Serial Communications Instructions Section 3-24
Variations
Applicable Program Areas
Operands The contents of the control words, C and C+1, are as shown below.
Note The serial port’s unit address can be specified directly by setting the serial
port number to 0 and setting the destination unit address to the serial port’s
unit address. (Set the destination unit address to 80 hex + 4
× unit number for
port 1 or 81 hex + 4
× unit number for port 2.)
Operand Specifications
Variations Executed Each Cycle for ON Condition TXDU(256)
Executed Once for Upward Differentiation @TXDU(256)
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
15 8 011 37 412
C+1
Destination unit address (See note.)
Serial Communications Unit's unit
address (unit number + 10 hex)
Serial port number
0: Specify directly. (See note.)
1: Port 1
2: Port 2
Port number specifier
(Internal logical port)
Specify 0 to 7 or F.
(F: Automatic allocation)
Always 00
Byte order
0: Most significant bytes first
1: Least significant bytes first
RS and ER signal control
0: No RS and ER signal control
1: RS signal control
2: ER signal control
3: RS and ER signal control
Area S C D
CIO Area CIO 0000 to CIO
6143
CIO 0000 to CIO
6142
CIO 0000 to CIO
6143
Work Area W000 to W511 W000 to W510 W000 to W511
Holding Bit Area H000 to H511 H000 to H510 H000 to H511
Auxiliary Bit Area A000 to A959 A000 to A958 A000 to A959
Timer Area T0000 to T4095 T0000 to T4094 T0000 to T4095
Counter Area C0000 to C4095 C0000 to C4094 C0000 to C4095
DM Area D00000 to
D32767
D00000 to
D32766
D00000 to
D32767
EM Area without bank E00000 to
E32767
E00000 to
E32766
E00000 to
E32767
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