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USB-4750 User Manual 14

3.3 Isolated Digital I/O Connections

3.3.1 Dry/Wet Contact Support for Digital Input

Each digital input channel accepts either dry contact or 0 ~ 5 VDC wet

contact inputs. Dry contact capability allows the channel to respond to

changes in external circuitry (e.g., the closing of a switch in the external

circuitry) when no voltage is present in the external circuit. Figure 3-1

shows external circuitry with both wet and dry contact components, con-

nected as an input source to one of the card's digital input channels.

Figure 3.2: Isolated Digital Input Connections

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