User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

GPS locked without differential correction.

GPS locked with differential correction.

Standard V1 accuracy will be about ±10 meters. V2 accuracy will normally

be ±2 meters and is dependent on the RTCM broadcast rate and the

distance between the mobile and the nearest base station.

5.4.4 GPS Receiver Setup

The setup procedure for a GPS receiver is generally different for each

manufacturer’s type. Connect a laptop or PC to the GPS receiver for

entering the desired sentences and update interval. A NMEA type GPS must

be configured as follows:

Type of sentence

Update interval

Status

GPRMC

1 second

Required

GPGGA

1 second

Required

GPVTG

1 second

Optional

The TRACE command may be used to verify correct GPS operation:

TRACE,ON,GPS

All characters received will be displayed on the Operator Port, including

sentence types. Verification that the position report is being transmitted at

the desired POS,nn interval may also be observed.

To disable the display output, enter:

TRACE,OFF

5.4.5 Position Reporting in Subnets

The SUBNET command assigns a subnet code number from 1-255. The code

number is maintained in the locked configuration parameter list along with

the serial number, customer number and frequency table. The command

formats are:

SUBNET

Display current subnet setting

SUBNET,OFF

Turn off the subnet number (must be unlocked)

SUBNET,nnn

Define a subnet number (must be unlocked)