iSXblue/SXBlue II GNSS Series Technical Reference Manual
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RTCM Data Output
To output (only) RTCM correction data from the internal SBAS correction source from the Serial, USB
or Bluetooth ports of the iSXBlue/SXBlue II GNSS, 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 communication between the iSXBlue/SXBlue II GNSS 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 iSXBlue/SXBlue II GNSS and device that
receives position information:
Figure B-2 RTCM Data Output From Serial Port
Note - For successful communication, the baud rate of the iSXBlue/SXBlue II GNSS Serial port
must be set to match that of the separate GPS receiver. Additionally, you must interface the
iSXBlue/SXBlue II GNsS to an RS-232C serial port of the separate GPS receiver. Refer to chapter
4 for instructions related to setting the iSXBlue/SXBlue II GNsS baud rate using the $JBAUD
command.
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 iSXBlue/SXBlue II GNSS 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 iSXBlue/SXBlue II GNSS 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.
To establish communications between the iSXBlue/SXBlue II GNSS and an external differential
5
GND
2
TX RTCM
