Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 179
Once in alarm, an output exits the alarm state when the output value returns to within the
specified limit by at least AlarmDeadband. For example, given a HiLimit Threshold of 5 and an
AlarmDeadband of 1, the output will exit alarm when its value becomes less than 4. Note there
is only one AlarmDeadband property per output, meaning all alarms for the output use the
same deadband.
An output can enter a new alarm state while already in alarm. For example, if you define two hi-
limit alarms, say one at 5 and another at 10, the output will enter alarm when its value exceeds
5, and then again if the value exceeds 10. This can be useful for triggering alarm transmissions at
more than one hi/low/roc limit.
Add Alarm and Delete Alarm are used to add and delete alarms, respectively.
Alarm Logging
The AlarmLogging property works in concert with the LoggingInterval property to control
whether an output is logged in alarm circumstances. When LoggingInterval is set higher than an
output’s measurement interval, then the measurement that causes an alarm wouldn’t be logged
if it were a measurement that did not fall on the logging interval. The AlarmLogging property
gives you a way to log the alarming data, regardless of the value of LoggingInterval. When
AlarmLogging is InAndOut, data that causes an output to enter or exit an alarm is logged. When
AlarmLogging is Always, all data while in alarm, and data causing the alarm exit, are logged.
Triggering an Alarm Transmission
You configure the system to transmit on alarm by setting the TxAlarmMode property of the
associated device to either TxIn or TxInAndOut. This property is found in the menu belonging to
the respective telemetry device. For example, to configure the system to make an alarm
transmission over Iridium when an output goes into alarm, first configure the output to alarm as
desired. Then enter the output’s Iridium sub-menu and set the TxAlarmMode property to either
TxIn or TxInAndOut.
When TxAlarmMode is TxIn, a transmission occurs when the output enters alarm. When
TxAlarmMode is TxInAndOut, a transmission occurs when the output both enters and exits
alarm.
Store and forward and cross device repeating SSP messages
The 8310 can store and forward SSP messages either back out the same port (“smart repeating”
or out another port (“cross device repeating”. Smart repeating is used in LOS radio systems to
send a message to a site which is on the fringe of reception or out of range by using a third site
in the middle. For instance if site A cannot reach site C, but site A can reach site B and site B can
reach site C - then smart repeating can be used to send from site A to site B and then on to site
C.
To set a PCBASE2 master station to use store and forward, set the radio path with the names of
the destination and repeating stations separated by “_”. For the previous example, the radio
path would be: B_C (read this as to site B then repeat to site C). Multiple repeaters can be
specified by chaining them together: B_C_D_E would send a message to B first which would
repeat it to C which would repeat it to D which would repeat it to E. One draw back to smart
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