DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 11

• Manufacturer Part Number: DVK-BTM521
• Description: BT MM DEV KIT
• Manufacturer: Laird Technologies
• Type: Transceiver, Bluetoothr

Specifications of DVK-BTM521

• Frequency: 2.4GHz
• Interface Type: RS-232
• Processor Series: BTM521
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Bluetooth
• Kit Contents: Development Board & Software Tools
• Features: Supports CSR
• Rohs Compliant: Yes
• For Use With/related Products: BTM521
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DVK-BTM521

BTM520/521
Bluetooth
AT COMMAND SET
REFERENCE
11 www.lairdtech.com
®
Multimedia Plus Module
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.
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.
Local Command Mode
Remote Command Mode
Data Mode
RF Unconnected
OK
ILLEGAL
ILLEGAL
RF Connected
OK
OK
OK
Laird Technologies