HP EISA/PCI Multiplexer Family Cabling, Diagnostics and Troubleshooting Manual

Troubleshooting and Diagnostics

Troubleshooting

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