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Name: AN-800: Programmable Discrete I/O System
Title: Programmable Discrete I/O System
Description: This application note describes the design of a universal discrete I/O system with 24 programmable outputs and 24 programmable inputs, easily modifiable to match specific customer system requirements. It is designed to operate with a standard 28 VDC aircraft power supply and uses several Holt IC devices that interface to GND/Open and Supply/Open sensors and provide 28V current source and current sink load drivers.

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