HP PCI Multiplexer Family Cabling, Diagnostics, and Troubleshooting Manual

Troubleshooting and Diagnostics
Troubleshooting
Chapter 670
Tests:
1. Log onto the console as root and verify that the port is enabled by
executing emux_diag and selecting Port Status - Breakout Box to
verify that the port is open.
2. Verify that the proper getty def entry has been selected for the port
in the/etc/inittab file.
Execute the following command (substituting the port in
(question for tty1a1) from the console to display the terminal
profile. Verify that the baud rate, character size and parity flags
set for the port match the terminal settings:
stty -a < /dev/tty1a1
3. Use emux_diag - Diagnostics to send data to the device for testing. If
the device does not receive data, check the cable connections.
4. To test for input data use emux_diag - Port Status - Data Scope. After
executing this utility, type a string of characters on the terminal
keyboard. The characters typed should appear on the emux_diag -
Port Status - Data Scope. If not, there is a problem on input. Again,
check your cable connections.
5. To narrow down the problem further, swap equipment. Try a
different terminal, another cable and another port. A breakout box is
a useful tool for debugging cabling problems. It can show what
RS-232 signals are being sent and received. Check for console boot
messages. Is the EISA/PCI Mux Card being recognized at boot-up
time?
Printer Problems
Problems:
• No output
• Printer overflows after printing correctly
• Printing is garbled
Causes:
• General port problem
• The printer connection is not wired correctly