Diagnostics Menu Selections; Loopback; Register Dump Display - HP AD278A Support Manual

NOTE: By default, the window content is saved in /tmp/profile
Figure 2-13 shows the Register Dump details.
Figure 2-13 Register Dump Display

Diagnostics Menu Selections

The Diagnostics menu seletion enables the user to perform the following tests:
•

Loopback

• Send
Loopback
The loopback test is designed to test the primary components of the adapter cards and their
functionality. The test can be run on a single port or a group of ports at the same time. The test
does not require that the selected port(s) have the transmit and receive pins wired together. You
have the option of running the test using an internal feature which loops back the data sent out.
This simulates a loopback cable. Data is looped both toward the computer as well as toward the
terminal.
The program starts by writing a data pattern to the selected ports, and reading the data back and
comparing it to a pattern written out. At regular intervals, the program reports the number of
characters transmitted and received, and the errors encountered. The data is transmitted in an
ascending pattern (from 0 decimal to 127 decimal). HP recommends that you disconnect any
devices connected to ports being tested (in external loopback mode).
To perform the external loopback test, attach a loop back connector that ties the port's transmit
and receive signals together. As the control characters are being sent, any terminals or printers
that are connected to the selected ports during the external loopback test may hang. To exit this
menu level, press the Esc key twice. To perform this test, select the Loopback sub-menu and
press Enter.
Figure 2-14 shows the loopback test result.
Diagnostics Menu Selections 23