Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 58 - CalAmp Proprietary & Confidential

To set up an appropriate Host Access List you would use the following commands:

AT$APP PARAM 1282,0,166.143.185.255

AT$APP PARAM 1282,1,172.90.255.255

In this case you should notice two differences from above, first is that we started with Index

0 since this is where the default value sits. The second this is that we didn’t need to put

PULS’s IP address in the list.

8.4

The last security feature of the LMU is the Primary Port Password. The password is a 4 byte

number that is programmed into the LMU using Parameter 1283. This password must be

present in the options header of any LM Direct message. If it is not present or is incorrect,

the LMU will not process that message. Please refer to the LM Direct Reference Guide on

how the password is included in the LM Direct options header.

Primary Port Password

For example, to set a password of 1234 you would use:

AT$APP PARAM 1283,0,1234

Keep in mind that PULS does not support the Primary Port Password feature and thus

enabling it will effectively disable your ability to use PULS.

A password of 0 disables this feature and is also the default value.

Passwords can only be applied to the LM Direct interface. They are not available for TAIP

or SMS.

8.5

It is possible to restrict the LMU’s ability to process AT Commands by an AT Command

Password. The password itself is store in Parameter 2177(Short Text String), Index 0 and is

enabled by setting Bit 4 of S-Register 171.

AT Command Password

Once the password has been set, and the mode is enabled, users must enter the password

before any AT Commands will be processed. If a password is not entered, the LMU will

respond with “Password Required”.

To enter the password you would use:

AT$PW “<password>”

The LMU will remain in an unlocked state until it is power cycled. Please note that the LMU

will remember the locked/unlocked state through a sleep cycle.

To program a password you would use:

AT$APP PARAM 2177,0,”<password>”