Gpio Pins Voltage Level; Gnss Rs232; Version; Dynamic Pin Functions - Advanced Navigation Spatial FOG Dual Reference Manual

RS232 port on the main connector. These pins are multi function and can be used to
extend Spatial FOG Dual with additional peripherals, sensors and data formats. The
GPIO pins have digital input, digital output, frequency input and frequency output
functionality. Additionally GPIO1 can function as an RS232 serial transmit line and
GPIO2 can function as an RS232 serial receive line. The GPIO serial and auxiliary
RS232 baud rate can be configured anywhere from 1,200 to 1,000,000 baud by using
the baud rate configuration dialogue in Spatial FOG Manager.
The GPIO pin functions and auxiliary RS232 functions available are listed below in
section 12.4. The function of a GPIO pin or auxiliary RS232 can be changed at any time
using the GPIO configuration dialogue in Spatial FOG Manager. The receive and
transmit functions of the auxiliary RS232 ports can be configured independently with
different functionality.
12.3.1

GPIO Pins Voltage Level

GPIO1 and GPIO2 are dual voltage level pins that can function at either 0 to 5 volt
levels or RS232 levels. When these pins are used for digital input, digital output,
frequency input or frequency output the pins operate at standard 0 to 5 volt levels (-
20 to 20 volt tolerant). When the pins are used for serial receive or serial transmit, the
pins automatically switch to RS232 voltage levels.
12.3.2

GNSS RS232

The GNSS RS232 is a fixed function RS232 port that is directly connected to the
internal Trimble BD930 GNSS receiver. This allows for configuration and upgrades of
the internal GNSS receiver and can also be used for sending differential or RTK
corrections.
12.4

Dynamic Pin Functions

Function
Inactive
1PPS Output
GNSS Fix Output
Odometer Input
Zero Velocity Input
Pitot Tube Input
NMEA Input
NMEA Output
Novatel GNSS Input
Topcon GNSS Input
ANPP Input
ANPP Output
Spatial FOG Dual Reference Manual
Page 79 of 138
26/06/2015
Type
Tristate
Digital Output
Digital Output
Frequency Input
Digital Input
Frequency Input
Serial Receive
Serial Transmit
Serial Receive
Serial Receive
Serial Receive
Serial Transmit

Version 1.0

GPIOs Auxiliary
RS232
All All
All
All
All
All
All
2 Receive
1 Transmit
2 Receive
2 Receive
2 Receive
1 Transmit