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Spatial FOG Reference Manual
Page 85 of 144
Version 2.3
03/05/2018
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
diferent 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 diferential or RTK
corrections.
12.4 Dynamic Pin Functions
Function Type GPIOs Auxiliary
RS232
Inactive Tristate All All
1PPS Output Digital Output All Transmit
GNSS Fix Output Digital Output All
Odometer Input Frequency Input All
Zero Velocity Input Digital Input All
Pitot Tube Input Frequency Input All
NMEA Input Serial Receive 2 Receive
NMEA Output Serial Transmit 1 Transmit
Novatel GNSS Input Serial Receive 2 Receive
Topcon GNSS Input Serial Receive 2 Receive
ANPP Input Serial Receive 2 Receive
ANPP Output Serial Transmit 1 Transmit
Disable GNSS Digital Input All