User manual

Troubleshooting and Further Information
162
33003962 11/2011
Terminal Self-Tests
Overview
XBT terminals perform 2 types of self-tests:
z self-test during power-up
z continuous self-test during operation
Self-Test Power-Up
When the terminal is powered up, the following self-tests are performed:
Continuous Self-Test
A continuous self-test checks that the program is operating correctly (watchdog).
NOTE: If a problem is detected that prevents operation of the product, the terminal
turns off all its LEDs, stops working and displays a system message number (if the
detected condition permits it to do so). If the same problem still persists after the
terminal has been switched back on, inform the maintenance department of this
system message number.
Element Tested Test Principle Non-passing Result Criterion Action in Event of Non-Passing
The working memory
(RAM)
Writing/reading Value read different from value
written
Operation impossible: STOP
The firmware Checksum calculation
and checking
Calculated checksum <>
stored checksum
Operation impossible: STOP
The application
memory
Checksum calculation
and checking
Calculated checksum <>
stored checksum
Operation impossible: Transfer
compulsory