User Manual

AS4000 Subscriber Terminal
Installation and Commissioning DLP 013
605-0000-436
Issue 1.5 Date: 18th October 1999
Page 6 of 14
Principle of operation
1. STMON intercepts messages that are sent from the ST approximately every two
seconds - this governs the screen update rate.
2. Immediately after power-up the ST outputs data for STMON specifying the ST
software version code and the ST RF channel code. STMON is updated with link
status information. Further STMON support can be disabled by pressing F2 to
‘Close’ STMON communications. STMON support can be reactivated by pressing
F1 to ‘Open’ STMON communications.
3. If a message is not received after five seconds, STMON reports a communications
time-out alarm. STMON support is reactivated by pressing F2 followed by F1 or
by stopping and re-starting the STMON program. If these actions do not clear the
comms time-out alarm, the cable connections should be checked, the com port
selection could be wrong or the ST or its power supply could be faulty.
STMON display panel description
1. A brief description of the STMON display panels follows.
Figure 45. STMON Display