Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 79 - CalAmp Proprietary & Confidential

• <time of fix> (4 bytes)

The Time of Fix of the GPS position in seconds referenced from Jan 1, 1970. This is

the same as the Time of Fix field in an LM Direct Event Report.

• <latitude> (4-bytes)

The latitude reading of the GPS receiver, measured in degrees with a 1x10-7 degree

lsb

• <longitude> (4 bytes)

The longitude reading of the GPS receiver, measured in degrees with a 1x10-7 degree

lsb, signed 2’s complement.

, signed 2’s complement.

• <speed> (4 bytes)

The speed as reported by the GPS receiver, measured in centimeters per second.

• <heading> (2 bytes)

The heading value reported in degrees from true North.

• <number Sats> > (1 byte)

The number of satellites used in the GPS solution.

• <fix status> (1 byte)

The current fix status of the GPS receiver bitmapped as follows:

Bit 0 – Predicted

Bit 1 – Differentially Corrected

Bit 2 – Last Known

Bit 3 – Invalid Fix

Bit 4 – 2D Fix

Bit 5 – Historic

Bit 6 – Invalid Time

• <carrier> (2 bytes)

The identifier of the Carrier/Operator the wireless modem is currently using.

• <RSSI> (2 bytes)

The received signal strength of the wireless modem in dBm. This value is signed in a

2’s complement format.

• <Comm. State> (1 byte)

The current state of the wireless modem bit mapped as follows

Bit 0 – Available

Bit 1 – Voice Network Service Found

Bit 2 – Data Service Found

Bit 3 – Data Session Connected

Bit 4 – Not Used

Bit 5 – Roaming

• <hdop> (1 byte)

The GPS Horizontal Dilution of Precision. It is a unit-less value reported with a 0.1

lsb.

Least significant bit