TITLE    : A useful and easy way of testing the serial COM ports from UNIX
OS LEVEL : AIX 
DATE     : 08/03/99
VERSION  : 1.0

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Create a loop-back plug with pins 2 & 3 linked.

Either issue the following from the command line or create a little
script file.

cat </dev/tty1 & cat /etc/passwd >/dev/tty1

The above should send /etc/passwd to COM 1 and display it on the monitor.
You should kill the background job on completion of your tests to keep 
the system tidy.