Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 859

Serial Communications Instructions
Variations
Applicable Program Areas
Operands
Note
Operand Specifications
826
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 words, C and C+1, are as shown below.
15 12 11 8 7 4
C
RS and ER signal control
0: No RS and ER signal control
Always 00
1: RS signal control
2: ER signal control
3: RS and ER signal control
15 12 11 8 7 4
C+1
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)
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
port 1 or 81 hex + 4 unit number for port 2.)
Area
CIO Area
Work Area
Holding Bit Area
Auxiliary Bit Area
Timer Area
Counter Area
DM Area
Indirect DM addresses
in binary
Indirect DM addresses
in BCD
Subroutines
OK
3 0
Byte order
0: Most significant bytes first
1: Least significant bytes first
3 0
Destination unit address (See note.)
Serial Communications Unit's unit
address (unit number + 10 hex)
S
CIO 0 to CIO 0 to
CIO 6143 CIO 6142
W0 to W511 W0 to W510
H0 to H511 H0 to H510
A0 to A959 A0 to A958
T0000 to T4095 T0000 to T4094
C0000 to C4095 C0000 to C4094
D0 to D32767 D0 to D32766
@ D0 to @ D32767
*D0 to *D32767
Section 3-23
TXDU(256)
@TXDU(256)
Not supported.
Interrupt tasks
OK
unit number for
C D
CIO 0 to
CIO 6143
W0 to W511
H0 to H511
A0 to A959
T0000 to T4095
C0000 to C4095
D0 to D32767