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B.1
Overview
Maintaining good signal connections is one of the most important factors in ensuring
that your application system is sending and receiving data correctly. A good signal
connection can avoid unnecessary and costly damage to your PC and other hard-
ware devices.
B.2
Isolated Digital I/O Connections
B.2.1
Dry/Wet Contact Support for Digital Input
Each digital input channel accepts either dry contact or 0 VDC - 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 pres-
ent in the external circuit. Figure C-1 shows external circuitry with both wet and dry
contact components, connected as an input source to one of the card's digital input
channels.
AIIS-3411 User Manual
Figure B.1 Isolated Digital Input Connections
68
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