BTM404-02 Laird Technologies, BTM404-02 Datasheet - Page 19

• Manufacturer Part Number: BTM404-02
• Description: MODULE, BLUETOOTH, BISM2 PA, 3.3V
• Manufacturer: Laird Technologies

Specifications of BTM404-02

• Compliance Standard: CE, FCC, IC, R, TTE
• Supply Voltage Range: 3.3V To 5V
• Physical Interfaces: UART
• Data Rate: 300Kbps
• Transmit Power: 65mW
• Receiving Signal Range: -87dBm
• Operating Temperature: RoHS Compliant
• Operating Temperature Range: -10°C To +85°C
• Rohs Compliant: Yes

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:
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 should not be discoverable (the master is by default not
discoverable), then the configuration commands are:
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.
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 2.1V is seen as assert. It is usual to connect the DTR line of
the host to the DSR line of this device.
9.4
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:
And the slave is configured by:
DSH_BTM404_0v5 BISM2 3V3 PA Data Sheet.DOC
When the units are next power cycled, the slave unit will wait for the master to connect to it and the
AT&F*
ATS512=4
ATS0=-1
AT&W
AT+BTR<bdaddr_m>
AT&F*
ATS512=3
ATS0=-1
AT&W
AT+BTR<bdaddr_m>
Audio Cable (voice)
AT&F*
ATS512=1
ATS504=1
ATS530=2000
ATS532=7
AT&W
AT+BTR<bdaddr_s>
AT&F*
19
© 2007-8 EZURiO Ltd
www.EZURiO.com