User manual

CONFIGURATION
001-7100-100 Version 0 Page 52 of 66 Vanguard 3G User Manual CDMA Version
Differential Correction: Differential GPS corrects various inaccuracies in the GPS system to
yield measurements accurate to a couple of meters when the mobile is moving and
even better when stationary.
5.9.3 Local Delivery
The GPS data can be delivered to up to two local PCs with UDP viewer programs can provide data
through a TCP connection, e.g. telnet. GPS data will be delivered once per second to all local PCs
TCP Server Format: Select one of the following options for the format of the GPS messages
TAIP no ID: Trimble ASCII Interface Protocol, a Trimble specified digital
communication interface. When this option is selected, the TAIP vehicle ID is not
included in the GPS messages.
TAIP with ID: Same as above except the Vehicle ID is reported
NMEA National Marine Electronics Association interface specification for electronic
equipment. The NMEA GPS message set includes several message types, each
containing specific GPS information. See message descriptions below. TAIP Vehicle ID
is not reported when NMEA is selected.
NMEA GLL: Position in LAT/LONG coordinates and time of day in UTC coordinates.
NMEA GGA: Position in LAT/LONG coordinates, time of day in UTC coordinates, fix
quality, number of satellites and altitude
NMEA RMC: Position in LAT/LONG coordinates, time of day in UTC coordinates,
ground speed in knots, heading in degrees and date
NMEA VTG: Ground speed in kilometers per hour and knots, heading in degrees.
To get GPS data by telneting into the device, enter the following from a prompt
telnet <local IP address of the Vanguard> 6257.
Note:
It is possible to telnet to the Vanguard 3G unit’s port 6257 from a remote location
however this is not recommended as delivering the data once per second across the
cellular network will greatly increase the amount of data transferred on the cellular
contract.
UDP Host Format: Same options as TCP server format
UDP Host Address: IP address of local PC that GPS data will be delivered to. This address
must be on the same subnet as the Vanguard 3G LAN IP
UDP Host Port: Port assigned to UDP program. This must match the port assigned in the
chosen UDP Port Listener Program.
Warning: Due to the dynamic nature of the WAN IP address on some cellular networks,
remote GPS reports being sent to a Host via UDP may start arriving with a different IP
address. In order for the Host to be able to identify the source of the report it is
recommended to:
a) Use “TAIP, with ID” reports as they contain Vehicle ID field that
can be set uniquely for each mobile
OR
b) Use middleware that maintains a constant IP address across cell
towers.