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b. A GPS Position, the SNR strength of which should consistently be greater than or
equal to 40. The Position will appear in both the message and location logs, and
the SNR will appear in the location log only.
The device will then send one GPS message every 10 minutes until its start-up period has expired
(a period of one hour). The SNR value for each GPS position should be a value no less than 38.
After this point, transmission intervals are tied to the rates laid out by Timer Zero if upright, or
Timer Two if inverted.
Response to commands
During testing, commands can be sent to the device to change configuration or request statistics.
These commands are read in during Iridium sessions and prompt responses from the Rover,
confirming that said commands were acted upon.
1) Send the $scm command, which will prompt the Rover to report its current timer intervals
and last GPS fix. This message also is automatically sent when one Timer Mode takes over
for another (example: Start-up to Normal Mode after 1 hour of operation).
Response to $scm
Inverted Messaging
At any time while the device is on, invert the device to sit it on its top white section. On the next
GPS session, the Rover will begin utilizing its bottom antenna for GPS and Iridium sessions.
The Rover will send an Orientation Change Message (a variant of the Stats message) on the first
Iridium session after inversion. The beginning of this message is below:
The Rover should be left in this orientation to allow the Rover to send several GPS fixes with its
bottom antenna. The same expectations in quality should be expected from the bottom antenna
as with the top. If the Rover has been on for greater than one hour, inversion will trigger Timer
2.
Rover User Manual Version 3.0
etc...
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