iSXblue/SXBlue II GNSS Series Technical Reference Manual
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Appendix B - Interface
This appendix provides information on interfacing the main aspects of your iSXBlue/SXBlue II GNSS.
The main purpose of the iSXBlue/SXBlue II GNSS is to provide differentially corrected position and
related information to a data logging or navigation device in the standard NMEA format. In addition to
the iSXBlue/SXBlue II GNSS operating as a positioning sensor, you may also have a use for the
correction data received by the internal SBAS demodulator.
The following sections detail how to interface your iSXBlue/SXBlue II GNSS depending on your
application.
GPS NMEA Output
When operating the iSXBlue/SXBlue II GNSS as a differential positioning tool, the data output from
either iSXBlue/SXBlue II GNSS communication port (Serial, USB or Bluetooth) is NMEA data that
provides a variety of information, such as position, speed, satellites tracked, and more. This is the normal
(default) data output and mode of operating the iSXBlue/SXBlue II GNSS.
To establish communications between the iSXBlue/SXBlue II GNSS receiver and your data logging or
navigation device in this mode of operation, you must:
•
Connect Pin-2 - transmit (TX) of the supplied iSXBlue/SXBlue II GNSS Serial cable to the receive pin (RX)
of the data logging or navigation device.
•
Connect Pin-3 - receive (RX) of the iSXBlue/SXBlue II GNSS Serial cable to transmit pin (TX) of the other
device if it is able to configure the iSXBlue/SXBlue II GNSS. Otherwise, this connection is optional.
•
Connect Pin-5 - signal ground of the iSXBlue/SXBlue II GNSS Serial Port to the signal return or ground of
the external device.
Figure B-1 illustrates the required interface between the iSXBlue/SXBlue II GNSS and an external device
using the serial cable:
Figure B-1 Serial Interface
Note - For successful communication, the baud rate of the iSXBlue/SXBlue II GNSS port must be
set to match that of the data logging or monitoring device. The SXBlue II GPS only supports an RS-
232C voltage level serial port. Refer to chapter 4 for instructions related to setting the
iSXBlue/SXBlue II GNSS baud rate with the $JBAUD command.
5
GND
2
TX NMEA
3
RX NMEA