SXBlue GPS Reference Manual
76
RTCM Data Output
To output only RTCM correction data from the internal SBAS correction source from the
Serial or Bluetooth ports of the SXBlue GPS, use the following procedure:
•
Turn off all NMEA and binary messages using the $JOFF<CR><LF> command
•
Turn RTCM on using the $JRTCM,1<CR><LF> command
To establish communications between the SXBlue GPS and an external GPS receiver,
you must:
•
Connect Pin-2-transmit (TX) of the serial cable to the receive pin (RX) of the separate GPS
receiver or logging device.
•
Connect Pin-5-Common Ground of the serial cable to the signal return or common ground
of the separate GPS receiver.
Figure B-2 illustrates the required interface between the SXBlue GPS and device that
receives position information:
Figure B-2 RTCM Data Output From Serial Port
Note - For successful communications, the baud rate of the SXBlue GPS Serial
port must be set to match that of the separate GPS receiver. Additionally, you
must interface the SXBlue GPS to an RS-232C serial port of the separate GPS
receiver. Refer to chapter 8 for instructions related to setting the SXBlue GPS
baud rate.
External Correction Input
In this operating mode, an external correction device inputs RTCM correction data
through the Serial port. In order to accomplish this, the SXBlue GPS must be
commanded to use external corrections using the $JDIFF command.
To configure external correction input on the Serial port you must:
•
Communicate with the SXBlue GPS on the Serial Port. Ensure that the baud rate of the
Serial Port and the external correction source match by issuing the appropriate $JBAUD
command.
•
Issue a $JDIFF,THIS<CR><LF> command through the Serial port.
5
GND
2
TX RTCM
