Communication Problems - IBM 3151 Manual To Operations

Communication Problems
Communication Problems
When the IBM 3151 has a communication problem with the host system:
• Reverse question marks
(~
. . . ) appear some place on the screen
or
• COMM NOT READY 1 or COMM NOT READY 2 appears on the bottom of
the screen
or
• Strange characters appear, characters are replaced with other characte!s, or
no characters are displayed.
The communication problem occurs with one of the following conditions. If you
know the check method, check each condition in the following sequence. If you
do not know the check method, report the problem to your supervisor.
1.
A setup value, such asline speed, parity, or stop bit, does not match the host
system's value.
Check the setup-value definitions on the COMMUNICATION menu.
• A parity error occurred in the received data.
• A stop bit was dropped in the received data.
• An ove.rrun condition occurred· in the display station when receiving data.
• A break signal was detected.
2. Application program problem.
3. Modem or ROLMI data communications equipment problem.
4. Modem cable problem.
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Chapter 5. Solving Problems
5-19