Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 24 - CalAmp Proprietary & Confidential

4.7

The LMU is capable of storing some of its values to non-volatile memory so that they can be

restored after a power cycle. The following values may be stored:

Restoring values through a power cycle

• The values of all 16 Accumulators

• The states of all 16 PEG Flags

• The state (inside or outside) of all 32 PEG Zones

• Last known GPS position

• The current value of the PEG State variable (see PEG Programming Guide for

details)

These values can optionally be saved at two points

• Before a soft reset (i.e. AT$APP QUIT or the Application Restart PEG Action)

• On ignition off

This feature is collectively known as an Environment Restore and is controlled by S-Register

127. Bits 0-3 control which values are saved where each bit is associated to a specific value.

If the bit is set, the associated value is saved. If it is cleared, the associated value is not saved.

The bit-mappings for bits 0-3 are as follows:

• Bit 0 = The values of all 16 Accumulators

• Bit 1 = The states of all 16 PEG flags

• Bit 2 = The state (inside or outside) of all 32 PEG Zones

• Bit 3 = Last known GPS position

Bits 6 and 7 of S-Register 127 control when these values are saved. If bit 6 is set, then the

values are saved on a soft reset. If bit 7 is set, then the values are saved on an ignition off.

For example to save all four values on just ignition off, you would use the following

commands:

Save Accumulators:

AT$APP PARAM 1024,7,1,1

Save PEG flags:

AT$APP PARAM 1024,7,2,2

Save PEG Zones:

AT$APP PARAM 1024,7,4,4

Save the last known GPS position:

AT$APP PARAM 1024,7,8,8