BTM410/411
Bluetooth
®
AT Data Module
54
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Laird Technologies
APPENDIX
Register
Deflt.
Range
Description
S551
$3211
$0..$ffff This register specifies 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 specifies the source for RTC
4..7 specifies the source for RTR
8..11 specifies the source for DV (i.e. DCD)
12..15 specifies 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 specifies 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.
S552
$0122
$0..$fff
This register specifies in each 4 bit nibble, how the DTR, DCD, RI
output pins are controlled when in a Bluetooth connection
Nibble 0..3 specifies the source for DTR
4..7 specifies the source for DCD
8..11 specifies 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
$0201
$0..$fff
This register specifies in each 4 bit nibble, how the DTR,DCD,RI
output pins are controlled when NOT in a Bluetooth connection
Nibble 0..3 specifies the source for DTR
4..7 specifies the source for DCD
8..11 specifies 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
Summary of Contents for BTM410
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