Product Info

Bluetooth Serial Module

AT Command Set

Date : 3 Feb 03 Issue No : 1.9 Doc No : XRBLU020-001SW-0 Page 29 of 38

When the units are next power cycled, the slave unit will wait for the master to connect to it and the master

will continually look for the slave. If a connection attempt fails, the master will wait for 2 seconds before

reattempting a connection. This 2 second delay can be varied by issuing it an ATS530 command with an

appropriate value in the range 100ms to 15000ms.

IMPORTANT NOTE: When S Reg 507 = 0, the DSR input to the module MUST be asserted for

the auto connection to succeed. When operating at TTL levels a 0V is seen as an assert state.

When operating at RS232 levels and voltage greater than 3V is seen as assert. It is usual to

connect the DTR line of the host to the DSR line of this device.

11.2 Audio Cable

With a pair of these modules it is possible to replace a mono audio cable with two way traffic. That is, a

setup where a microphone is connected to a speaker at the remote end and vice versa. So this mode

effectively replaces two audio cables.

Assuming the bluetooth address of the master to be <bdaddr_m> and that of the slave to be <bdaddr_s>,

the master module is configured by sending it the following AT commands.

AT&F

ATS512=1

ATS504=1

ATS530=2000

ATS532=1

AT&W

AT+BTR<bdaddr_s>

And the slave is configured by,

AT&F

ATS512=4

ATS0=-1

AT&W

AT+BTR<bdaddr_s>