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100

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Laird Technologies

BTM510/511

Bluetooth

Multimedia Module

S531 0 0..4 Species the mode on connection establishment.

0 = Normal, that data is exchanged between UART and RF.

1 = LOCAL_COMMAND. UART input is parsed by the AT

interpreter and RF data is discarded.

2 = REMOTE_COMMAND. RF input is parsed by the AT interpreter

and UART data is discarded. If S Register 536 is not 1 then this

3 = LOCAL_COMMAND. UART input is parsed by the AT

interpreter and incoming RF data is sent to the host using the

RX<string> asynchronous response.

4 = LOCAL_COMMAND and on the rf side, the GPIO is auto-

matically sent when there is a change in input. (digital I/O cable

replacement mode).

S532 0 0..7 If non zero then on every connection, a SCO channel (audio) will

be initiated. Bit 0 for HV1, Bit1 for HV2 and Bit2 for HV3. When

the connection is lost, the SCO channel disappears along with it.

S535 20 0..41 Link Supervision Timeout. If units go out of range, then a NO CAR-

RIER message will be sent to the host after the time specied here.

S536 0 0..1 When set to 1, a remote device can ‘capture’ the AT parser of this

unit by it sending this module an escape “!!!” sequence. The inter

character timing is set via S Register 12.

If S Register 507 is >= 2, then reading this register will always

return 0 and writing 1 will result in ERROR 33.

S539 0 0..1 When set to 1, in idle mode (S512=1), UART Rx characters are

discarded if DSR is de-asserted.

S541 20 -43..20 This sets the power level in dBm when inquiring or paging. Read-

ing this register returns the value stored in non-volatile memory.

S542 4 -43..20 As per S541, however reading this register returns the current

power level as set in the base band. The read can be different from

S541because the actual power is set using a lookup table and the

base band rounds down to the nearest value in the table.

S551 $3211 $0..$ffff This register species in each 4 bit nibble, how the outgoing

modem status bits to the remote peer gets its value. Bluetooth®

allows for RTR, RTC, DV and IC bits to be exchanged over an

RFCOMM connection.

Nibble 0..3 species the source for RTC

4..7 species the source for RTR

8..11 species the source for DV (i.e., DCD)

12..15 species the source for IC (i.e., RI)

Each nibble can take the following value:

0 Always set to 0

1 Always set to 1

2 If DCD (pin 8 on module connector) is output then always 1

If DCD is input then 1 if DCD is asserted otherwise 0

3 If RI (pin 6) is output then always 0

If RI is input then 1 if RI is asserted otherwise 0

4 If DSR (pin 10) is asserted then 1 otherwise 0

In the event that a nibble species DSR as the source of its state,

be aware that if, S Register 507 is anything other than 0, a de-as-

sertion of DSR will cause the Bluetooth connection to be dropped.

If bits 0..3 and 4..7 are set to 0, then some Bluetooth devices will

use that as a signal to stop sending any data back.

AT COMMAND SET

REFERENCE