User manual

84
 PAD Mode
Select buttons to set the PAD mode of the Vanguard SC as a Server or Client
 Pad Protocol
Sets the data protocol of the PAD to tcp or udp data
 TCP Client Keep Alive
When in client mode and enabled, TCP Keep Alive packets will be sent from the client to the server periodically in
order to detect a broken connection. The modem will automatically try to re-establish the connection if necessary.
Changing this setting will affect the use of TCP Keep Alive on the next client session. It will not affect an existing
session. When this option is enabled, the timing and number of Keep Alive attempts is controlled by parameters
defined on the External Serial page. It is not possible to have different timing settings for each serial port
 PAD Log
If enabled, a log of the data passed through the modem is saved at /tmp/intpadlog. The log will stop saving data
when full and data is lost at modem reset.
3.9 GPS
The Vanguard Cellular Broadband Router contains a standalone, high-accuracy, high-report-rate (12 satellites with WAAS
and Differential Correction, 1 report per second) GPS receiver.
The GPS LED on the front panel provides the status of the receiver:
GPS LED MEANING
Off No GPS installed or Cell-modem GPS disabled
Amber Acquiring GPS position
Green Valid positions being reported
Red Position lost, reporting Last Known Position
Flashing Red Position lost for more than 2 minutes
3.9.1 AAVL
The "Autonomous Automatic Vehicle Location" (AAVL) feature adds the ability for GPS-equipped Vanguard Cellular
Broadband Routers to transmit position reports either to a host connected to the local Ethernet port or to a remote host
over the cellular network. AAVL allows the system designer to specify the maximum distance or the time interval between
remote position reports.
Position reports can be transmitted in a number of possible formats. When the format is disabled or the Address or Port
fields are blank, no report is sent.