OSKER User Manual Version 3.0
18
The OSKER
’s Timers
Timer Types
SBD
The OSKER will communicate with the Iridium Gateway based on this interval. If the OSKER
successfully registers with the Iridium Satellite Constellation, it will send any messages queued
for transmission. Once this is finished and the queued outgoing messages have been
implemented, the OSKER will receive any queued commands from the Iridium Gateway.
GPS
The OSKER will communicate with the GPS network and get a location fix based on this interval.
Any successful GPS fixes will be queued for the next Iridium transmission.
The OSKER’s
real-time
clock will also be set and adjusted based on the GPS network. The GPS interval will execute before
the SBD interval if they are scheduled for the same time.
OSKER Timer Modes
Start-up Mode
Start-up mode (Timer 1)
will begin when the OSKER is turned on via magnet removal, or if the
OSKER is reset by an SBD command. This mode will last for one hour, after which the OSKER will
enter
Normal mode.
Normal Mode
Once Start-up mode has finished, the OSKER will enter
Normal mode (Timer 0)
. This is the default
timer mode of the OSKER and will be used if no other modes apply. At default settings, the OSKER
will transmit 1 GPS fix every 10 minutes. If no other modes are engaged, the OSKER will continue
in normal mode until its batteries are depleted or the unit powered off.
Alarm Mode
If a watch circle has been set, the OSKER will enter
Alarm Mode (Timer 2)
when it exits the set
radius or when the device detects it has been inverted on its GPS interval (if enabled).
While in watch circle alarm mode, the OSKER will send information pertaining to the Watch Circle
with each message, such as distance from centre and the duration in minutes that the device has
been in that mode.
If the device enters Alarm Mode due to inversion, the device will send an Orientation Change
Message (see Stats message) at each point that it has changed its antenna used for transmission.
No-GPS-Fix Mode
If the OSKER is unable to get a GPS fix after repeated attempts, it will transmit a GPS Failure
message and move to this timer mode
(Timer 4)
.
