SkyTrac Systems Ltd.
Document Rev. 01.020 DOC0334 Page 28 of 49
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4.2.2 Digital Ground Seeking Inputs
Ground seeking pins indicate a logical TRUE to the microcontroller if the input is grounded.
Table 17—Digital Ground Seeking Input Descriptions
Description and recommended usage
Asserted when ground is applied.
Asserted when ground is applied. Recommended to be
used for external emergency toggle switch.
Asserted when ground is applied. Recommended to be
used with flight event as a toggle switch.
Asserted when ground is applied. Recommended for
general use.
Asserted when ground is applied. Recommended to be
used as Engines On/Off toggle switch.
Note: All Digital Inputs are referenced to the ISAT-200 DIO GND. ISAT-200 DIO_GND is
isolated from the system ground; DIO_GND must be connected to aircraft ground for the
digital inputs to function correctly.
The status of the digital inputs can be checked from the ISAT-200 Menu. Please refer to the
ISAT-200 User Guide for help navigating the menu.
4.2.3 Digital Voltage Seeking Inputs
Table 18—Digital Voltage Seeking Input Descriptions
Description and recommended usage
Asserted when 28V is applied. Recommended to be
used as a mission event toggle switch.
Note: All Digital Inputs are referenced to the ISAT-200 DIO GND. ISAT-200 DIO_GND is
isolated from the system ground; DIO_GND must be connected to aircraft ground for the
digital inputs to function correctly.
The status of the digital inputs can be checked from the ISAT-200 Menu. Please refer to the
ISAT-200 User Guide for help navigating the menu.
If more voltage seeking inputs are required, some of the analogue inputs can be configured as
voltage seeking inputs. See section 4.2.8: Analogue Inputs.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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