Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 1047

Serial Communications Instructions
Description
Area
EM Area with bank
Indirect DM/EM
addresses in binary
Indirect DM/EM
addresses in BCD
Constants
Data Registers
Index Registers
Indirect addressing
using Index Registers
TXDU(256) reads N bytes of data from words S to S+(N 2)–1 and outputs the
raw data in no-protocol mode from the Serial Communications Unit with the
unit address specified in bits 0 to 7 of C+1, through the port specified with bits
8 to 11 of C+1. The logical port number can be set to any value between 0
and 7 and is specified with bits 12 to 15 of C+1.
The start and end codes specified for no-protocol mode in the allocated DM
Setup Area are added to the data before the data is output. Up to 259 bytes
can be sent, including the send data (N = 256 bytes max.), the start code, and
the end code.
Data can be sent only when the Communications Port Enabled Flag for the
specified logical port (A20200 to A20207 for ports 0 to 7) is ON and the TXDU
Instruction Executing Flag (in the allocated DM Setup Area) is OFF.
Note The logical port number can be allocated automatically by setting bits 12 to 15
of C+1 to F. For details, refer to Automatic Allocation of Communications Ports
on page 1032.
S
En_00000 to En_00000 to
En_32767 En_32766
(n = 0 to C) (n = 0 to C)
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
--- Specified values
only
--- ---
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Section 3-24
C D
En_00000 to
En_32767
(n = 0 to C)
#0000 to #0100
(binary) or &0 to
&256 (decimal)
DR0 to DR15
1007