SXBlue II GPS Series Technical Reference Manual
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output through Port C. The SXBlue II GPS acts as a pass-through for the RTCM data.
Either port may be configured to accept RTCM data input and this command then allows
another port to output the RTCM data. To configure the SXBlue II GPS to output RTCM
data on the current port from data input on another port, issue the following command:
$JASC,VIRTUAL,r<CR><LF>
To configure the SXBlue II GPS to output RTCM data on a specific port from RTCM data
input on another port, issue the following command:
$JASC,VIRTUAL,r,PORTy<CR><LF>
Where the message status variable, ‘r’, may be one of the following:
r
Description
0*
OFF
1
ON
And the port number variable “y” can be A, B or C for the Bluetooth, Serial and USB
respectively.
The SXBlue II GPS will reply with the following response:
$>
4.2.4 $JALT
This command turns altitude aiding on or off for the SXBlue II GPS. When set to on,
altitude aiding uses a fixed altitude instead of using one satellite’s observations to
calculate the altitude. The advantage of this feature, when operating in an application
where a fixed altitude is acceptable, is that the extra satellite’s observations can be used
to betterment of the latitude, longitude, and time offset calculations, resulting in improved
accuracy and integrity. Marine markets, for example, may be well suited for use of this
feature.
This command has the following layout:
$JALT,c,v[,GEOID] <CR><LF>
Where feature status variable, ‘c’, and threshold variable, ‘v’, may be one of the
following:
c
Description
NEVER
This is the default mode of operation where altitude aiding is not used.
SOMETIMES
Setting this feature to SOMETIMES allows the receiver to use altitude aiding,
dependent upon the PDOP threshold, specified by ‘v’
ALWAYS
Setting this feature to ALWAYS allow the receiver to use altitude aiding
regardless of a variable. In this case, you may specify the ellipsoidal altitude, ‘v’
that the receiver should use. Optionally, if you specify the ‘,GEOID’ field, the
receiver will use the GEOID as its reference.
