useful for firmware updates of the internal GNSS receiver.
10.2 Serial Interface
There are two serial ports available for use. The GPIO port can also be used as a serial port, with less
functionality.
Model Primary Port Auxiliary Port GPIO Port
Boreas ANPP only over RS232 or
RS422. No dynamic pin func-
tions
ANPP over RS232 or RS422,
10.6.1 Dynamic Pin Functions
ANPP over RS232, 10.6.1
Dynamic Pin Functions
Table 31: I/O Ports Available
10.2.1 Baud Rate
The default baud rate of Boreas 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 Boreas Manager. The
GPIO port baud rate can be set anywhere from 4800 to 250,000 baud. It is important to select a baud rate that is
capable of carrying the amount of data that Boreas has been configured to output. See 11.1.4 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.
10.2.2 Format
The format is fixed at 1 start bit, 8 data bits, 1 stop bit and no parity. See 11 Advanced Navigation Packet
Protocol for details on the ANPP protocol.
10.3 1PPS Signal
There is a dedicated 1PPS signal available on the 6.6 IO Connection. It can be set to either 0 to 5 V or 0 to 3.3
V. See the 9.1.3.14 Advanced section of the Configuration Menu for information on changing this setting.
The 1PPS signal reference ground is the GPIO ground domain. See 7.7 Electrical Domains for more
information.
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.
10.4 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.
v1.2 Page 93 11 Oct 2022
Boreas Reference Manual • Interfacing
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