Knowledgebase

Issue:

Garbage characters are displayed upon dial-up connection to the Ultraport serial card.

Solution:

A: There are 2 possible solutions to this problem. See answer 1 and answer 2.

Answer 2:
The problem could be triggered when the session is not terminated properly.  In this scenario a Dialer was
set up called (dialHA24) that gets called when a new getty is spawned. This happens whenever a session is ended. What could be happening is that the Dialer is unable to open the port and returns a fail code to getty. When that happens, gett apparently does not re-negotiate the baud rate on subsequent calls. You can work around this problem by putting in a delay and making sure that the Dialer return code is zero. 
This can be done by creating a script that calls the dialer routine with a 5 second delay.  For example,  

###################################################

sleep 5;/usr/lib/uucp/dialHA24 -hx0 tty2A 2400 &

exit 0 

###################################################

 
Note that it is necessary to have the dialer executed as a background task and that the exit code from the
script be zero.  The command line  '/usr/lib/uucp/dialHA24 -hx0 tty2A 2400'  is what getty executes.