DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 51

• 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
51 www.lairdtech.com
®
Multimedia Plus Module
Task
Enable AVRCP profile
Set AVRCP role
Set AVRCP category
Initiate outgoing AVRCP con-
trol connection
Close only AVRCP connection
5.4.3 SUBUNIT INFO Response
5.4.4 PASS THROUGH Indication
5.4.5 PASS THROUGH Response
It is mandatory to respond to a SUBUNIT INFO command if configured as AVRCP target.
Required response parameters are Subunit type and MaxSubUnitId.
The response is sent automatically with a fixed value of 0x09 (“Panel”) for parameter
Subunit type and a fixed value of 0x00 for parameter MaxSubUnitId (only one subunit exists,
which is panel).
An incoming PASS THROUGH command will be indicated by an unsolicited message.
AVPTI <subunit_id
For subunit_id
<button_state>: ‘0’ is Button pushed
AT+AVR<avrc_response_type
If S register 310 == 0, a Pass Through (PT) response is required from the host. The response
is sent using the command:
AT+AVR<avrc_response_type
Parameter:
<avrc_response_type
If S register 310 == 1, a Pass Through response is sent automatically with an
<avrc_response_type> defined by S register 311. In this case, the host is not required to respond.
‘1’ is Button released
AT-Command / S Register
S102
S301 [0..2]
S302 [0..4]
AT+AVD<bd_addr>
“AT+AVH“ or “ATH110E”
hex
see Table 3.21. For operation_id
hex
>,<operation_id
dec
>: see Table 3.22, write-value.
dec
hex
>
>
hex
>,<button_state>
Comment
256 = AVRCP, Error 47 if AVRCP role has not
been set (see S301);
Error 48 if S301== 2 and Category has not
been set (see S302)
Needs subsequent AT&W and ATZ to
become effective
0 = disabled
1 = Control “CT” (default)
2 = Target “TG”
Needs subsequent AT&W and ATZ to
become effective
0 = Feature disabled (default)
1 = Player/Recorder
2 = Monitor/Amplifier
3 = Tuner
4 = Menu
Needs subsequent AT&W and ATZ to
become effective
Response if accepted:
“CONNECT 0123456789012,110E,>”
Response if rejected:
“NO CARRIER 110E”
Response:
“NO CARRIER 110E” if connection has
existed and S329=0
“NO CARRIER” if connection has not existed
and S329=0
hex
see Table 3.20.
Laird Technologies