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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
USB-4750 User Manual 14