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Where <bdaddr_m> is optional. If it is not specified, then the slave unit
will accept connections from any device. If specified then only
connections from the device specified will be accepted.
If it is desired that the slave unit not be discoverable (the master is by
default not discoverable), then the configuration commands are,
AT&F
ATS512=3
ATS0=-1
AT&W
AT+BTR<bdaddr_m>
Where <bdaddr_m> is optional. If it is not specified, then the slave unit
will accept connections from any device. If specified then only
connections from the device specified will be accepted.
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 Register 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.
7.2 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
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