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analogue alarms will function in sleep mode; however the delays before an alarm is sent are
affected by the analogue alarm check period and the time for the unit to wake up and register
– the interaction between these timers need to be carefully considered.
•
Use Low Power Mode
– Enable or disable Low Power Mode (LPM).
•
Min Awake Time
– Set the minimum period of time that the wireless modem should stay
awake.
•
The wireless modem may be busy performing configured operation and therefore exceed
the time value entered here, but once the configured interval has expired and the wireless
modem has been inactive for a short period it will automatically switch to LPM.
•
Our recommendation is that this value should never be less than 4 minutes.
•
Periodicity
– See description above (under Data Logging (SWT1)).
•
Analogue Alarm Check Period
– If the wireless modem is in LPM then the scanning interval
of the analogue inputs can be set to every X minutes.
•
Reducing the scanning frequency can provide power savings as the action of scanning an
analogue input requires a small power burden when the analogue inputs are powered up to
take a reading. In addition if sensor power is used, then reducing the frequency at which the
sensor is turned on will save power.
•
Wake-up if Send Req
– The unit wakes up if there is a send request trigged by another timer
(SWT2, 3 or 4). If not checked, the unit will only wake up according to the SWT5 time
interval, and then perform the required tasks.
•
Note: Alarm tasks will always wake up the unit.
•
Sleep when Send Req is Done
– The unit will go back to LPM as soon as the required tasks
are performed. If not checked, the unit will stay awake for the time specified under "Min
Awake Time".
What you should know about the Low Power Mode
•
If the unit operates from a battery and you need to conserve power it can be set to wake up
every X minutes, for Y minutes, to send data etc.
•
When the wireless modem wakes up it will scan the SWT timers and determine which timers
are ready to trigger a data send.
•
If an SWT timer is not ready to trigger a data send, and the wireless modem wakes up, then
any sending for that timer will be ignored.
•
During Low Power Mode operation there is no contact with the network and SMS will be
held in the carriers SMS Central, so you cannot guarantee the order in which SMS will be
delivered to the wireless modem. This means that you if you send an SMS to configure an
option and later send a reset, then there is no guarantee which of the commands that will be
executed first. As a reset can cause the wireless modem to restart without consideration of
any other activity on the wireless modem, you might find that your second (configuration)
command "gets lost" so you need to plan accordingly.
