DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 79

• 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
79 www.lairdtech.com
®
Multimedia Plus Module
Service
1.
2.
3.
4.
5.
M: mandatory
O: optional
N/A: not applicable
Data call without audio feedback
Data call with audio feedback
Fax services without audio feedback
Fax services with audio feedback
Voice call
8.1 Profile Activation
8.2 Initiate DUN Connection
DUN profile is activated by setting flag 0x04 in S102 plus “AT&W” plus “ATZ“.
AT+DUD<bd_addr
Initiate ACL connection to remote device with <bd_addr
DUN profile (HSP).
Response: <cr,lf>CONNECT 123456789012,1103,><cr,lf>
Or:
Or:
Or:
Or:
After an DUN connection has been established, the module changes its mode to the mode
defined by S Register 531. The recommended value is S531=0 for a DUN connection (=default).
Before initiating a DUN connection, S507 must be set to 2 (ats507=2). This will cause the module
to escape from connected mode to command mode by toggling DSR line only. An escape
sequence of “^^^” is not compliant with the DUN specification. S507=2 also configures
the module for high data throughput.
Once the Bluetooth connection is established all data arriving at the UART is transferred to the
gateway, hence any AT commands will be transferred directly to the gateway. Now the host can
e.g. dial in to the internet provider by “ATD123456” as if directly connected to a serial modem.
8.2.1 Release DUN Connection
AT+DUH
The module must be in command mode so that AT-commands will be parsed. If the
module is in data mode (S531=0, S507=2), toggle DSR line to change into command
mode. <cr><lf>OK <cr><lf> will be sent to the host to confirm that that module is in
command mode. Toggling DSR means to de-assert (deactivate) an and assert (activate)
the DSR line within a time specified by S519 which is 500 ms per default. Hence DSR needs
to be asserted at the time of AT+DUD<BdAdd>, if data mode with S531=0 and S507=2 or
S507=1 is configured.
DSR asserted means a voltage level of logic 0 (0.0 V) at the module pin, because the UART
level shifter inverts the signal. Accordingly, DSR de-asserted means a voltage level of logic
1 (3.3 V) at the module pin.
Response:
On Bluetooth disconnection:
<cr,lf>NO CARRIER<cr,lf>
<cr,lf>ERROR 59<cr,lf>
<cr,lf>ERROR 63<cr,lf>
<cr,lf> ERROR 65<cr,lf>
hex
>
Specification
M
O
N/A
N/A
N/A
Support in DT
<cr,lf>NO CARRIER 1103<cr,lf>
BTM
Yes
No
No
No
No
hex
>. The remote device must support the
N/A
N/A
Specification
M
O
N/A
Support in GW
Laird Technologies
BTM
No
No
No
No
No