816
Serial Communications Instructions Section 3-23
Description TXD(236) reads N bytes of data from words S to S+(N÷2)–1 and outputs the
raw data in no-protocol mode (RS-232C mode) from a serial port on a Serial
Communications Option Board mounted to the CPU Unit. (The output port is
specified with bits 8 to 11 of C.)
The start and end codes specified for no-protocol mode are added to the data
before the data is output. The start and end codes are specified in the PLC
Setup.
Data can be sent only when the port’s Send Ready Flag is ON. The Send
Ready Flag is A392.13 serial port 1 and A392.05 for serial port 2.
Up to 259 bytes can be sent, including the send data (N = 256 bytes max.),
the start code, and the end code.
Note Serial port 1 is the port on the Serial Communications Option Board mounted
in option slot 1 and serial port 2 is the port on the Serial Communications
Option Board mounted in option slot 2.
DM Area D0 to D32767
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants --- Specified values
only
#0000 to #0100
(binary) or &0 to
&256 (decimal)
Data Registers --- DR0 to DR15
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area S C N
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