9.1.2.8 GNSS Receiver Passthrough
Description
:
This function allows for pass through connection to the internal
GNSS receiver. This is useful for firmware updates of the internal
GNSS receiver.
9.2 Serial Interface
There are two serial ports available for use, Primary and Auxiliary. Both ports support ANPP over RS232 or
RS422.
9.2.1 Baud Rate
The default baud rate of GNSS Compass is 115,200. The primary and auxiliary port baud rate can be set
anywhere from 4800 to 4,000,000 baud and can be modified using the Baud Rates page in the web UI or GNSS
Compass Manager. It is important to select a baud rate that is capable of carrying the amount of data that
GNSS Compass has been configured to output. See 10.1.4 Packet Rates for more details on the data output
calculation. The data rate in bytes per second can be calculated by dividing the baud rate by 10. For example if
the baud rate is 115200, the data rate is 11520 bytes per second. If the selected data rate is insufficient, data
may be lost without a warning.
The Support team can provide a baud rate calculator if it is required. For more information, contact Support at
support@advancednavigation.com.
9.2.2 Format
The format is fixed at 1 start bit, 8 data bits, 1 stop bit and no parity. See 10 Advanced Navigation Packet
Protocol for details on the ANPP protocol.
9.3 1PPS Signal
There is a dedicated 1PPS signal available on the Serial Connection of the GC2-SER Serial variant
The signal is normally low and pulses high for 100 milliseconds to signal the precise second, which starts on the
rising edge of the signal.
This dedicated 1PPS signal is the recommended 1PPS signal to use as it is more accurate. The validity of this
1PPS signal can be monitored using the time initialised status flag.
9.4 CAN Interface
The CAN interface is available on the Connector Pin-out, and is used for low-level device integration with other
vehicle systems.
A CANopen EDS file is available. Contact the Advanced Navigation support team at
support@advancednavigation.com for a copy of this.
v2.0 Page 69 04 Nov 2021
GNSS Compass Reference Manual • Interfacing
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