Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 45 - CalAmp Proprietary & Confidential

Setting bit 5 will place the BTA in low security mode, clearing it will use high

security mode.

6.1

When acting as a host port, the LMU-4100™ and newer BTA will actually present three

ports:

Using the BTA as the Host Port

• Port 1 which is used for NMEA output using a Serial Port Profile

• Port 2 which is used as the primary Serial Port Profile or Dial-Up Networking profile

• Port 3 which is used for AT Commands and Debug output.

Please note that for some host devices, all three of these ports may not be visible.

Older BTAs will present only a single port using the profile selected by Bit 4 of S170. Each

of the above functions (NMEA, Dial-Up Networking and AT Commands/Debug) can be

performed over this port, but only one can be handled at a time.

6.1.1 NMEA Output

The NMEA Output is separated from the other functions on Port 1 so each may be run

simultaneously.

In this case, users must simply setup S128 to reflect the desired NMEA messages. For

example, to export the NMEA RMC and GGA messages, users would use:

ATS128=5

Note that you do not need to worry about the BAUD rate or the profile in use. Port 1

(NMEA) always makes use of the Serial Port Profile and the BAUD rates are handled by

Bluetooth.

When you pair to the BTA, be sure to select the NMEA port (or first serial port profile) to

connect to this function.

6.1.2 AT Command and Debug Output

Like the NMEA feature, the AT Command and Debug output is separated from the other

Bluetooth features on Port 3. This means that you can issue AT Command while the

Bluetooth Adapter is providing NMEA data and while it is acting as a modem.

To setup, the LMU-4100™ to allow debug output, you will just need the following:

• BTA is used as a Host port (1)

• BTA needs to be discoverable (bit 2 = 1)

• BTA will act as an acceptor (bit 3 = 0)

ATS170=5