DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 63

• 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
63 www.lairdtech.com
®
Multimedia Plus Module
(e.g set of buttons /
Telephone control
keypad / display)
Microphone
7.1 Hands-Free Unit Role (HF)
Speaker
Hands-free role is activated by setting flag 0x10 in S102 plus “AT&W” plus “atz“. Figure 3.24
outlines a block diagram with a BTM5xx in hosted operation mode.
7.1.1 Initiate Service Level Connection (SLC) from HF (#1_4.2)
7.1.2 Initiate Audio Connection from HF (#3_4.11)
7.1.3 Release Audio Connection from HF (#3_4.12)
7.1.4 Release Entire Connection from HF (#1_4.3)
AT+HFD<bd_addr
Initiate service level connection (SLC) from local hands-free instance to remote device
with <bd_addr
the Hands-free profile (HFP).
Response:
SLC established: <cr,lf>CONNECT 123456789012,111F,><cr,lf>
Failed:
Or:
Or:
After a SLC connection has been established, the module remains in AT command mode.
S Register 531 is ignored for HFP connections.
AT+HFA
Initiate audio connection from local Hands-free instance. An existing service level
connection is required.
Response:
Audio on:
AT+HFR
Release audio connection only. The service level connection will be retained.
Response:
Audio off:
AT+HFH
Release connection from local Hands-free instance. Audio connection will be released if
existing, SLC will be released anyway.
Response:
On audio disconnection:
On SLC disconnection:
hex
Figure 3.24 Hands-free unit block diagram
>. The remote device must support the audio gateway role (AG) of
<cr,lf>NO CARRIER<cr,lf>
<cr,lf>ERROR 59<cr,lf>
<cr,lf>ERROR 63<cr,lf>
<cr,lf>HF”AU1”<cr,lf>
<cr,lf>HF”AU0”<cr,lf>
hex
>
Cancellation
<cr,lf>HF”AU0”<cr,lf>
<cr,lf>NO CARRIER 111E<cr,lf>
Echo
Controller
Host
Audio
(only if audio connection exists)
BTM5xx [HF]
AT command
interface
Laird Technologies