Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 93
9.5.4. Alarm Tx Mode
Alarm Tx Mode determines whether transmissions are made when the station goes (into alarm)
or (when it goes into and out of alarm).
If the Alarm Tx Mode is Tx In, the station will only make a transmission when it goes into
alarm.
If the Alarm Tx Mode is Tx In And Out, the station will make a transmission when it goes
into alarm and it will make another transmission when it goes out of alarm.
Random and Alarm transmissions are the only types of transmissions triggered by
alarms.
The telemetry setting Alarm Interval can be used to keep transmitting as long as a
station is in alarm. Please see the Telemetry section for details.
ROC alarms setup for Since Last Tx do not generate out of alarm events or
transmissions.
9.5.5. Alarm Logging
If Alarm Logging is set to Every Measurement, the system logs on the Measurement
Interval.
If Alarm Logging is set to Use Logging Interval, the system logs on the Logging Interval.
This setting is only relevant if the customer setup the Measurement Interval to be more
frequent than the Logging Interval. In that case, the system can be configured to log
more frequently when it is in alarm.
Here is an example of a system setup to log more frequently while in alarms. The system is set up
to read the temperature sensor every two minutes and check for alarms. If the temperature
exceeds 20 degrees, the system will go into alarm. The system will log once every two minutes
when in alarm, and once an hour when not in alarm.
Measurement Interval = 00:02:00
Logging Interval = 01:00:00
Alarm Logging = Every Measurement
Alarm 1 = Hi
Threshold = 20
9.5.6. Alarm ROC Interval
This setting affects ROC (Rate of Change) alarms. When set to Since Last Meas the system will
compare two consecutive scheduled readings when deciding whether to trigger alarms.
When it is set to Since Last Tx, the system will compare the current sensor reading with the last
transmitted reading. If there is no past transmission, the first reading made after boot up is used.
9.6. Alarm Computation Details
This section contains details on how Satlink decides whether to go into alarms. The section is
broken down by the user chosen Alarm Type setting:
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