Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 42 - CalAmp Proprietary & Confidential

The first value indicates what the S-120 setting should be. For example to use a generic

CDMA modem driver you would use:

ATS120=140

If you are unsure of what driver you should use for your external device, pick the generic

one (ATS120 = 128) as it can be adapted to most network technologies.

5.4.2 Configuring the Modem Port’s BAUD Rate

Like the Host Port, the Modem Port only allows users to change the BAUD rate settings.

The Data Bits are always set to 8, there is always 1 Stop Bit, and always no Parity. The

BAUD rate is controlled by S-Register 146. The available settings are:

• 4=4800

• 5=9600

• 7=19200

• 9=38400 (Default iDEN)

• 10=57600

• 12= 115200 (Default GPRS & CDMA)

• 255 = use default

In general, you can usually set this S-Register to use the technology default value (i.e.

ATS146=255) as the LMU will attempt to automatically detect and change the current

BAUD rate of the external phone or modem.

5.4.3 Setting the dial string

The Dial String is effectively the phone number a host device, such as the LMU, would use

to establish a Dial-Up Networking session with the external phone or modem. In most

cases, the external phone or modem will use a technology specific value.

• CDMA 1xRTT Dial String = #777

• GPRS Dial String = *99***1#

• iDEN Dial String = 0

The Dial String is controlled by Parameter 2316. For example to use a CDMA dial string,

you would enter the following AT Command:

AT$APP PARAM 2316,0,”#777”

One important thing to note for GPRS devices is that the LMU will not program the APN

settings into the external phone or modem. It is assumed that the APN settings have been

pre-configured by the provider of the phone or modem.