Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 23 - CalAmp Proprietary & Confidential

For example, let us assume that all inputs are biased low. If Ignition is On, and Inputs 2 and

4 are high then the COMM LED will blink twice, followed by a pause, followed by 4 more

blinks.

This mode is enabled by setting both Bits 3 and 5 of S-Register 171.

To enable this mode, you would use:

AT$APP PARAM 1024,51,40,40

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

AT$APP PARAM 1024,51,40,0

4.6.3 Disabling the Status LEDs

In some installations it may be desirable to disable the status LEDs, for instance when the

installation is covert and drivers/end users should not be able to easily locate the LMU.

Turning the status LEDs off is controlled by bit 3 of S-Register 140. If this bit is set, then

the Comm and GPS LEDs are disabled and turned off. If this bit is cleared, then the Comm

and GPS LEDs will behave as normal.

To disable the LEDs you would use:

AT$APP PARAM 1024,20,8,8

To re-enable them, you would use:

AT$APP PARAM 1024,20,8,0