Sierra Wireless 20070914 - Manual (Page 105)

Global Positioning System (GPS)
Rev 3.0B Feb.08 92
If the PinPoint X doesn’t receive acknowledgement for a
“window”, the modem will PING the server with a message
containing the sequence numbers of the first and last packets
that haven’t been acknowledged. The PinPoint X will continue
until the server acknowledges receipt. When the PinPoint X
receives the acknowledgement, it will advance its “window” to
the next group.
When the PinPoint X is first powered on (or reset), it will send
a Set Window message to sync up with the server for the
current “window”.
On the other side, if the server receives an out of sequence
packet, it will send a message to the modem noting the missing
sequence and the PinPoint X will retransmit.
Figure 10-11: AceManager : PinPoint - *PPSNFR, *PPMAXRETRIES
Simple Reliable Mode will ‘give up’ after a configured
number, *PPMAXRETRIES, of attempts and discard messages
that cannot be transmitted or received after that number of
tries.
Sending Reports Based on an Interval
You can configure the PinPoint X to send reports based on a
time interval and/or on the movement of a vehicle (based on
it’s position from one time to the next).
Figure 10-12: AceManager : *PPTIME, *PPDIST, *PPTSV, *PPMINTIME
• *PPTIME ‐ Location report sent every set time interval
(seconds).
• *PPDIST ‐ Location report sent only if the position is more
than the set distance (x 100 meters)
• *PPTSV ‐ Location report sent if the vehicle has been in
one location (stationary) for more than a set time interval
(minutes).
• *PPMINTIME ‐ Location report sent at no less than this
time interval (seconds).