Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 22 - CalAmp Proprietary & Confidential

For the GPS LED (Yellow) the GPS LED will indicate OFF (LED off), ON (slow blink)

and TIME-SYNC (fast blink) as it always has. When the GPS is acquired, it reports the

number of satellites being tracked by going on for 500mS, off for 500mS and then for each

satellite being tracked, on for 125mS and off for 125 mS. After 5-sec, the pattern repeats.

:For example, an LMU tracking 6 satellites would have a blink pattern similar to the

following:

Figure 6 - Alternate GPS LED Blink Pattern

This mode is enabled by setting bit 3 of S-Register 171.

AT$APP PARAM 1024,51,8,8

To return the LEDs to their normal behavior, you would use:

AT$APP PARAM 1024,51,8,0

4.6.2 Alternate LED Blink Code

This mode also reports input status along with Comm and GPS Status.

The GPS LED will be off if the Ignition is off or if the LMU does not have a GPS fix.

Otherwise, the GPS LED will report the number of satellites by blinking ‘n’ times after a

single long blink. (i.e. similar to the pattern described above).

The COMM LED behavior is a little more complicated.

When the Ignition is off, the COMM LED will blink at a 1Hz rate (1 blink per second).

When the Ignition is on but the LMU does not have Comm and no other inputs are ‘active’,

the COMM LED will blink at a 4Hz rate (1 blink every ¼ of a second).

If the Ignition is on with no other inputs ‘active’ and the LMU does have Comm, the

COMM LED will be solid.

If the Ignition is on and other inputs are 'active', the COMM LED will blink the number of

time corresponding to the first 'active' Input's designation followed by a pause and then the

number of times corresponding to the next 'active' Input's designation.

An 'active' Input is one whose state does not match the corresponding bias setting in S-158.