Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 10 - CalAmp Proprietary & Confidential

S-Registers start at S-120 and end at S-171. For the Parameter commands (or messages) this

corresponds to an Index range of 0 to 51. That is, the Index of an S-Register is the S-

3.3

3.3.1 What is Parameter Masking?

Parameter Masking

Parameter masking is a means of programming select parts of a Parameter’s Value. This only

applies to Parameter Values that are bit mapped. It is important to note that ALL S-registers

must be masked when they are programmed via the Parameter AT Command. When using

the ATS<n> command a mask value of 255 (0xFF) is automatically used. PULS™ also

assumes a full mask for any bit mapped value it changes.

3.3.2 What is a bit mapped parameter values?

Bit mapped Parameter Values are ones where each bit controls a different setting within the

LMU. That is, each bit tends to turn on or off a particular feature (say the TAIP interface)

depending if the bit is set or cleared. Bit mapping of values is most common in S-Registers,

though there are some other Parameters that support it.

3.3.3 How is a mask used?

A Mask allows a programmer to select which bits of a Value to change. That is, if bit 0 in the

mask is set, then the value of bit 0 can be changed. The mask value has the same range as the

Value. That is a 1 byte Value (range of 0-255) will have a 1 byte mask (also ranging from 0-

255).