Spatial FOG Reference Manual
Page 84 of 144
Version 2.3
03/05/2018
12 Interfacing
12.1
Communication
Communication with Spatial FOG is over the primary RS422 or RS232 interface in the
Advanced Navigation Packet Protocol (ANPP). The RS422 or RS232 format is fixed at 1
start bit, 8 data bits, 1 stop bit and no parity. See section 13 for details on the protocol.
12.1.1
Baud Rate
The default baud rate of Spatial FOG is 115,200. The baud rate can be set anywhere
from 1,200 to 10,000,000 baud and can be modified using the Spatial FOG Manager
software or the baud rate packet, see section 13.10.3. It is important to select a baud
rate that is capable of carrying the amount of data that Spatial FOG is set to send. See
packet rates in section 13.5 for more details on 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 115,200, then the data rate is 11,520 bytes per second.
12.2
External Data
External sources of position, velocity and/or heading can be integrated into Spatial
FOG's filter solution. The data can be sent to Spatial FOG in the ANPP format over the
primary port or through one of the GPIO pins in a number of diferent formats. If using
the ANPP, please use Table 17 below to find the relevant section. If using the GPIOs,
please see section 12.3.
Packet
Section
External Position and Velocity
External Position
External Velocity
External Body Velocity
External Heading
External Time
External Depth
External Pitot Pressure
External Odometer
External Air Data
Table 17: ANPP external data reference
12.3
GPIO Pins and Auxiliary RS232
Spatial FOG contains two general purpose input output pins and one auxiliary RS232
port on the main connector. These pins are multi function and can be used to extend
Spatial FOG with additional peripherals, sensors and data formats. The GPIO pins have
Содержание Spatial FOG Dual
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