SXBlue II GPS Series Technical Reference Manual
6
Table 1-2 Default Port Settings
Port
Baud Rate
Data Bits
Parity
Stop Bit
Interface Level
Bluetooth
N/A
8
None
1
Serial Port Profile
Serial
9600
8
None
1
RS-232C
USB
9600
8
None
1
Serial Port
Emulation
The Bluetooth port (PortA) is fixed and should not be changed.
-
SXBlue II GPS serial number older than 0808A100: Bluetooth baud rate is 9,600. From
S/N 0808A100 to 1002A724, Bluetooth baud rate is 57,600. For S/N 1002A725 and up,
Bluetooth baud rate is 115,200
-
For SXBlue II-B GPS with S/N 1111B01 and above, baud rate is 115,200 (57,600 for
older serial numbers)
-
For SXBlue II-L GPS with S/N 1203L01 and above, baud rate is 115,200 (57,600 for
older serial numbers)
When setting up COM port parameters in a software that will communicate via Bluetooth to the
SXBlue receiver, any baud rate can be specified, but in order to avoid communication overflow,
care must be taken in properly selecting the number of sentences output on a port at a
particular baud rate. The Serial and USB ports can be configured from 2,400 to 115,200 baud.
Table 1-3 Default GPS NMEA Message Output
Port
GPS NMEA Messages
Update Rate
Bluetooth
GGA, GSA, GSV, VTG, ZDA
1 Hz
Serial
GGA, GSA, GSV, VTG, ZDA
1 Hz
USB
GGA, GSA, GSV, VTG, ZDA
1 Hz
The SXBlue II GPS outputs standard NMEA messages by default. Five basic sentences are
output: GGA, GSA, GSV, VTG and ZDA. All ports are fully independent from one another and
can be set to input or output different messages (NMEA, Binary, Differential correction) at
different rates.
Table 1-4 Default Parameters
Max DGPS Age
From 3D to 2D
Elevation Mask
3600 seconds
When PDOP > 10.5
10
°
Because of the unique technology used on-board the SXBlue II GPS, the maximum DGPS age
can be set to 3600 seconds. Once the SXBlue II GPS loses its differential correction source, the
output will remain submeter for the next 40-45 minutes. See chapter 2 for more information.
The receiver is set to switch from 3D mode to 2D mode when there are less than 4 satellites or
when the PDOP value exceeds 10.5. It is usually up to the user software to allow or restrict 2D
mode operation, but this setting can be changed on the receiver ($JALT command).
The satellite elevation mask is set to 10 degrees by default. All satellites below this value will not
be used in the solution.