System Startup, Configuration, and Shutdown Reference Manual (32650-90907)

Appendix A
Using the Access Port (AP)
Configuring the Console
182
During the execution of self-test, some of the test numbers shown above may have the mnemonics NC, NT1H,
or NS1H appended to them. Whether or not these appear depends upon the test hood configuration present at
the time of test execution.
NOTE The master terminal after the completion of the self-test is the terminal that was master when
the test was initiated.
Using Control Commands
The following section describes additional commands that can be executed with the simultaneous use of the
control key.
Entering Control Mode
Both a local and remote user can enter
CTRL B to initiate a mode change from console mode to control mode.
Halting Scrolling
Entering
CTRL S causes the AP to stop passing characters from its port queues to the consoles. The queues
continue to accept characters from the system. The XOFF is not passed to the system port being used for the
transfer.
Allowing Scrolling
Entering
CTRL Q causes the AP to resume passing characters from its port queues to the consoles if this was
previously stopped by XOFF character. The XON is not passed to the system port being used for the transfer.
Entering Escape Characters
The escape character
CTRL V nullifies whatever character follows it, except for XON and XOFF characters.
Any character following a
CTRL V has no effect on AP operation.
Changing Master Consoles
Only one console can operate as the system console at a time. It is referred to as the master. The other, usually
the remote terminal, can view data but cannot enter data until it takes control.
Break is used to take control
back and forth between the system console and an enabled remote console. When the remote console enters
Break, it becomes the master console, and vice versa. In order to enter data at the remote terminal, you must
press
Break.
Interpreting AP Error and Informational Messages
The AP provides two classes of messages. A message that is followed by (APERR XX) is an error message. “XX”
indicates the error number. A message that is followed by (APMSG XX) is an informational message, although
it can indicate a potential error. Error and informational numbers may be duplicated; for example, there is
both an APERR 01 and an APMSG 01.
Error Codes and Error Messages
MESSAGE: Unable to verify assertion of RESET SYS backplane signal (APERR 01)
CAUSE: This message, displayed during execution of the RS command, means that the backplane signal
RESET_SYS- is not asserted when the AP attempts to reset the SPU.
This error might be caused by any one or a combination of four conditions.