Disabling software flow control; using RTS/CTS.
Different versions of AIX 3.2.5 respond differently to attempts to
enable flow control (RTS/CTS signals). This section is an attempt to
compile a list of different approaches.
The most straight forward is:
chdev -l ttyxx -a rts=yes
[ Note: ix40410 for AIX 3.2.5 should give you this functionality.
PTF U426113 and numerous other superceding ptfs should provide this.]
If carrier signal is high (its connected) you can try
stty add rts
There is also a program that I first saw on the 800-IBM-4FAX number,
also found in INFO that will remedy the situation in some cases. Note
that this code ignores the return code from ioctl (which on my machine
is <0 :)