4 audio cable (voice), Audio cable (voice) – Rainbow Electronics DAB-WLS-C21 (BlueTooth) User Manual
Page 19
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DSH_BTM402_0v9 BISM2 PA Data Sheet.DOC
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The ATS507=2 setting puts the device in DSR drop mode only. This means that when the device
needs to be reconfigured, deasserting the DSR line will ensure that the module responds quickly to AT
commands. This further means that in stand alone mode, the DSR input line MUST be asserted e.g.
0V in TTL signal mode.
The slave is configured by:
AT&F*
ATS512=4
ATS0=-1
AT&W
AT+BTR
Where
any device. If specified then only connections from the device specified will be accepted.
If it is desired that the slave unit should 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
Where
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: The DSR input to the module MUST be asserted for the auto connection to
succeed. When operating at TTL levels a low (0V) is seen as an assert state. When operating at
RS232 levels any voltage greater than 2.3V is seen as assert. It is usual to connect the DTR line of
the host to the DSR line of this device.
9.4
Audio Cable (voice)
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
AT&F*
ATS512=1
ATS504=1
ATS530=2000
ATS532=7
AT&W
AT+BTR
And the slave is configured by:
AT&F*