Intermec IF30

Chapter 5 — Using the IF30 GPIO Interfaces
74 IF30 Fixed Reader User’s Manual
Isolated Input Interface
This method is used to minimize noise induced by distance or
grounding. The isolated input avoids induced noise by
referencing a remote input to chassis return of the IF30. The
illustration below shows how to wire in this method.
Isolated Input Interface
Open Collector Interface
The input can be connected to an open collector interface of an
external device. This implies that the grounds are tied together
for two systems. The common ground can be a source of noise,
so you should follow good grounding practices for both the IF30
and the input device.
In this situation, the IF30 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 Interface
+
-
External
input
switch
10-48 VDC
Twisted
p
air
-Input
+Input
+Input
+12V
Ground
- Input