Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 66 - CalAmp Proprietary & Confidential

This is the maximum speed the GPS Receiver has produced since the LMU was

powered up. This value is in centimeters per second

<odo-skip>

This value is an ‘as the crow files’ distance value computed between two GPS

positions. This computation occurs when the LMU regains GPS signal after losing it

for more than 1 second. This value is in meters.

This is the overall distance the LMU has travelled since power up. The value is

displayed in meters.

The ODO message is enabled by setting bit 0 of S126 and having general debug enabled.

AT$APP PARAM 1024,6,1,1

ATS125=3 (or ATS125=7)

It is disabled either by clearing Bit 0 of S126 or turning general debug off:

AT$APP PARAM 1024,6,1,0

ATS125=0

9.5.2 Position Update Message

The POS message, like the ODO message is meant to provide a compact description of the

current GPS position of the LMU. This message can be displayed in two formats, either as a

NMEA RMC message or as a POS message. This choice of format is controlled by S-

2 is cleared then it appears as a POS message. The message is displayed in accordance to the

update rate.

To display an RMC message you would use:

AT$APP PARAM 1024,36,4,4

To display a POS message you would use:

AT$APP PARAM 1024,36,4,0

The POS message can also be displayed in response to the Display Position PEG Action.

The POS message format is as follows:

POS,<parameter>,<time of

fix>,<latitude>,<longitude>,<heading>,<speed>,<HDOP>,<

number of sats>,<fix status>