User's Manual

18
www.lairdtech.com
Laird Technologies
BTM410/411
Bluetooth
®
AT Data Module
REGISTER DEFAULT RANGE COMMENT
S551 0x3211 0xFFFF This register specifi 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 specifi es the source for RTC
4..7 specifi es the source for RTR
8..11 specifi es the source for DV (i.e. DCD)
12..15 specifi 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 specifi es DSR as the source of its state, be aware
that if, S Register 507 is anything other than 0, a de-assertion 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. For example, Nokia 6310
stops responding.
If this register is changed while in command and connected mode, then on
going back online using the ATO command, a fresh signal will be sent to
the peer to update the bits.
S552 0x0122 0x0FFF This register specifi es in each 4 bit nibble, how the DTR, DCD, RI output pins
are controlled when in a Bluetooth connection
Nibble 0..3 specifi es the source for DTR
4..7 specifi es the source for DCD
8..11 specifi es the source for RI
Each nibble can take the following value:-
0 Do NOT touch the I/O
1 Always deassert
2 Always assert
3 If RTC bit in CONTROL_IND is 1 then assert otherwise deassert
4 If RTR bit in CONTROL_IND is 1 then assert otherwise deassert
5 If DV bit in CONTROL_IND is 1 then assert otherwise deassert
6 If IC bit in CONTROL_IND is 1 then assert otherwise deassert
If this register is changed while in command and connected mode, then on
going back online using the ATO command, the modem output lines will
get refreshed.
S553 0x0201 0x0FFF This register specifi es in each 4 bit nibble, how the DTR,DCD,RI output pins
are controlled when NOT in a Bluetooth connection
Nibble 0..3 specifi es the source for DTR
4..7 specifi es the source for DCD
8..11 specifi es the source for RI
In addition it also refers to S Register 552 to see if the relevant pin is an input
or not to be touched. If the nibble in 552 is 0, then the relevant pin is an input.
Each nibble can take the following value:-
0 Always deassert
1 Always assert
2 Assert if RING is being sent to the host
CONFIGURING
THE BTM410/411