DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 100

• 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
100 www.lairdtech.com
®
Multimedia Plus Module
Register
S520
S521
S523
S524
S525
S526
S530
Deflt.
9600
9521
1
0
0
3
1000
Range
1200..
..115200
1200..
..921600
1..2
0..2
0..1
1..3
100..15000
Description
Change to a standard baud rate. The effect is immediate and in
fact the OK will be sent at the new baud rate. Only one of the
following baud rates are accepted: 1200,2400,4800,9600,19200,
28800,38400,57600,115200.
If S register 525=1, then the maximum baud rate is limited to
115200.
Change baud rate to non-standard value. BTM modules support
any baud rate. The only limitation is the integer arithmetic
involved, which may adjust the applied rate slightly. If the
internally computed baud rate is more than 2% offset from the
desired input value, then an ERROR will be returned and the old
baud rate will prevail. To inspect the actual baud rate, do ATS521?
S521 should only be sued for non-standard baud rates.
For standard baud rates use S520.
The effect is immediate and in fact the OK will be sent at the new
baud rate.
If S Register 525=1, then the max baud rate is limited to 115200
In the event that a non-standard baud rate is requested, it is
entirely possible that the host is not capable of generating
such a baud rate. In this case the BTM device cannot be
communicated with. If this happens, there is a procedure to
recover from this situation which is described in section 13, page.
95 “Factory Default UART Baud Rate”.
Number of Stop bits
See S Register 526 for further information.
Parity. 0=None, 1=Odd, 2=Even
For the Go blue Activator variant of the module this register is
read only.
See S Register 526 for further information.
Apply multiplier of 8 to baud rate internally. This is set to 0
(disabled) by default. If S Register 521 > 115200 then this
register cannot be set to 1.
See S Register 526 for further information.
This register specifies a 2 bit mask used to qualify how S Registers
520 to 525 are actioned.
If bit 0 is 1, the new communication parameters affect the UART
immediately.
If bit 1 is 1, the new communication parameters are stored in
non-volatile memory
So for example, to change communication parameters, but have
them come into effect only after subsequent power cycles, then
this register should be set to 2, and likewise to affect immediately
and yet not have it persist over a power cycle, the value should be
set to 1. Must be set before the baud rate change.
Reconnect delay when configured as master in pure-cable-replace-
ment mode. This value is rounded down to the nearest 100ms.
See S Register 505 also.
Laird Technologies