BTM410/411
Bluetooth
®
AT Data Module
9
www.lairdtech.com
Laird Technologies
AT COMMAND SET
REFERENCE
3.
AT
C
OMMAND
S
ET
R
EFERENCE
Introduction
This document describes the protocol used to control and configure the BTM Bluetooth device.
The protocol is similar to the industry standard Hayes AT protocol used in telephony modems which is
appropriate for cable replacement scenarios, as both types of devices are connection oriented.
Just like telephony modems, Laird Technologies’ devices power up in an unconnected state and will only
respond via the serial interface. In this state the device will not even respond to Bluetooth Inquiries.
Then, just like controlling a modem, the host can issue AT commands which map to various Bluetooth
activities. The configuration of the device can be saved, so that on a subsequent power up the device is
discoverable or automatically connects.
The device has a serial interface which can be configured for baud rates from 1200 up to 921600
(default setting is 9600) and an RF communications end point. The latter has a concept of connected
and unconnected modes and the former will have a concept of command and data modes. This leads to
the matrix of states shown below.
Table 3-1: Mode RF connections
RF Unconnected
RF Connected
Local Command Mode
OK
OK
Remote Command Mode
ILLEGAL
OK
Data Mode
ILLEGAL
OK
The combinations, ‘Data and RF Unconnected Mode’ and ‘Remote Command and RF Unconnected
Mode’ do not make sense and will be ignored.
Navigation between these states is done using the AT commands which are described in detail in
subsequent sections.
Summary of Contents for BTM410
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