Tait T800 SL2 25W, Service Manual

Page: 265 / 383

M8SL2-00-002-812
Circuit Operation D2.7
© Copyright Tait Electronics Limited August 2004. All rights reserved.
2.4 Confirmations
Additional to alarms the T803 microprocessor also monitors eight non-alarm triggers
known as Confirmations:
• Power-up
• Channel change
• Up to six user defined function tone inputs
The T803 micro responds to a confirmation trigger in the same way as it does to an
alarm trigger – depending on what has been programmed into the EEPROM, a tone
sequence may be sent, an auxiliary output enabled and/or a pip tone enabled. These are
all actioned by the micro with the same rules as for alarm triggers. The only difference is
that there are no LEDs associated with confirmations.
If several confirmations are triggered together they are actioned in the following order
of priority: Power-up, Channel change and then User Confirmation 0 to 5. If several
alarms and confirmations are triggered together the Power-up confirmation, if enabled,
is always actioned first, followed by any alarms and then any other confirmations, both
in their normal priority order.
Note: Confirmations will re-send any user programmed tone sequence if re-trig-
gered.
2.5 Clearing Alarms and Confirmations
The alarms can be cleared by either pressing both front panel switches together or send-
ing the T803 a correctly programmed (“Clear Alarms”) function tone. All alarms are
cleared together. Clearing alarms turns off all LEDs, cancels any associated pip tones
and resets auxiliary outputs. If an alarm condition is still valid when it is cleared, it will
be re-latched and the user-programmed action will be executed. If required, pip tones
can be cleared separately (leaving alarms latched) by using a “Clear Alarm/Confirma-
tion Pip tones” function tone.
When the Line fail alarm is cleared, the T803 will revert to the mode it was in (Basesta-
tion or Repeater) before the alarm was triggered. A keying sequence from line can also
clear this alarm in the same way except that the pip tone will not be cleared if used by
other latched alarms. Line fail is the only alarm that can be cleared individually in this
way.
Confirmations can not be cleared by a single command like the Alarms. Confirmation
pip tones are cancelled by using a “Clear Alarm/Confirmation Pip tones” programmed
function tone and the auxiliary outputs are individually reset by using a “Turn OFF
Auxiliary output (x)” function tone.
It is possible to have more than one Alarm or Confirmation using the pip tone. In this
situation the clearing behaviour must be carefully considered:
• Line Fail Pip – Cleared by line keying-sequence only if pip tone is not ‘active’
for other Alarms and/or Confirmations.