Advantech USB-4750 - Manual (Page 20)

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