BTM410/411
Bluetooth
®
AT Data Module
46
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Laird Technologies
AT COMMAND SET
REFERENCE
It is stated above that during sniff mode, a slave listens for N slots every M slots. The Bluetooth
specification states that a master can have up to 7 slaves attached to it with all slaves having
requested varying sniff parameters. It may therefore be impossible to guarantee that each slave
gets the M parameter it requested. In light of this, the protocol for enabling sniff mode specifies
that a requesting peer specify the M parameter as a minimum and maximum value. This will allow
the master to interleave the sniff modes for all slaves attached.
For this reason, the sniff parameters are specified in the BTM module via four S registers. S Register
561 is used to specify ‘N’, S Register 562 is used to specify ‘T’ and S Registers 563/564 are used to
specify minimum ‘M’ and maximum ‘M’ respectively. Although the specification defines these
parameters in terms of timeslots, the S register values have to be specified in units of milliseconds
and the firmware does the necessary translation to timeslots.
Figure 3.8: Sniff Mode Example
8.
Maximum RF-Tx Power Level
The maximum RF transmit power level for all operation states (inquiring / connecting / in
connection) is controlled by S541 / S542.
9.
Manufacturing Info String
A string with manufacturing information can be retrieved by “ATI200”.
10.
Bluetooth Version
The Bluetooth version can be queried by “ATI18”.
Figure 6: Sniff Mode Example
Содержание BTM410
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