Publication 1762-RM001C-EN-P
20-4 ASCII Instructions
Protocol Overview
MicroLogix 1200 Series A and later, and
MicroLogix 1500 Series B, FRN 4 or later
The AWA and AWT instructions only successfully transmit an ASCII string
out of the RS-232 port when the channel is configured for DF1
Full-Duplex protocol. If the RS-232 port is configured for any protocol
other than DF1 Full-Duplex, the AWA and AWT instructions will error out
with an error code of 9.
DF1 Full-Duplex packets take precedence over ASCII strings, so if an AWA
or AWT instruction is triggered while a DF1 Full-Duplex packet is being
transmitted, the ASCII instruction will error out with an error code of 5.
See Table E.2 on page E-5 for the DF1 Full-Duplex protocol parameters
that you set via the Channel 0 configuration screens in your programming
software. Configuration of the two append characters for the AWA
instruction can be found in the General tab of Channel Configuration
option in RSLogix 500.
MicroLogix 1200 Series B, FRN 3 and later, and
MicroLogix 1500 Series B, FRN 4 and later
For the AWA and AWT instructions, you can use DF1 Full-Duplex protocol
as described above. To use the full ASCII instruction set, use ASCII
protocol as described below.
See Table E.9 on page E-14 for the ASCII parameters that you set via the
Channel 0 (and Channel 1 for the 1764-LRP) configuration screens in your
programming software. Configuration of the two append characters for
the AWA instruction can be found in the General tab of Channel
Configuration option in RSLogix 500.
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