User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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www.lairdtech.com/bluetooth
29
CONN-GUIDE-BT730_v0.9
Reg.
#
Defaul
t
Range
Comment
S521
TBC
1200..9216
00
Change baud rate to non-standard value. Laird 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 is returned and the old baud rate prevails. To inspect the
actual baud rate, do ATS521?
S521 should only be used for non-standard baud rates. For standard
baud rates use S520.
The effect is immediate and the OK is 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 Laird Technologies device cannot be communicated
with. If this happens, there is a procedure to recover from this
situation which is described in section titled “Factory Default Mode”
The default is 9600 for the Laird module and 115200 for other Laird
devices.
See S Register 526for further information.
S522
1
1
1 = CTS/RTS hardware handshaking enabled
For the Go blue Activator variant of the module this register is read
only.
See S Register 526 for further information.
S523
1
1..2
Number of Stop bits
For the Go blue Activator variant of the module this register is read
only.
See S Register 526 for further information.
S524
0
0..2
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.
S525
0
0..1
Apply multiplier of 8 to baud rate internally. This is set to 0 (disabled)
by default for the Laird Technologies Module/RS-232
Adaptor/Universal RS-232 Adaptor, and set to 1 (enabled) by default
for the Laird Technologies PC Card.
It is required in the PC Card because the UART chip on the PC Card
is driven by a 14.7456MHZ crystal instead of 1.8432MHz. This means
that when a host asks for a baud rate, in reality it gets a baud rate
which is 8 times faster.
If S Register 521 > 115200 then this register cannot be set to 1.
For the Go blue Activator variant of the module this register is read
only.
See S Register 526 for further information.