Chapter 5 — Using the IF61 GPIO Interfaces
116 IF61 Fixed Reader User’s Manual
Isolated Input Interface
Use this method to minimize noise induced by distance or
grounding characteristics. The isolated input avoids induced
noise by referencing a remote input to chassis return of the IF61.
The next illustration shows how this method is wired.
Isolated Input Interface
Open Collector Input Interface
The input can be connected to an open collector interface of an
external device. This typically implies that the grounds are tied
together for the two systems. The common ground can be a
source of input noise, so you should follow good grounding
practices for both the IF61 and the input device.
In this situation, the IF61 provides power to the pull-up resistor
for the open collector. Connect the +Input pin to the +12 VDC
source as shown in the next illustration.
Open Collector Input Interface
+
-
External
input
switch
10-48 VDC
Twisted
pair
-Input
+Input
+Input
+12V
Ground
- Input
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