Intermec IF2 IF2 Network Reader User Manual - Page 100
Isolated Input Interface, Open Collector Input Interface, Use the IF2 GPIO Interfaces
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Chapter 6 - Use the IF2 GPIO Interfaces +12 V +Input - Input External input switch Ground IF2 Powered Input 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 IF2. The next illustration shows how this method is wired. +Input External input switch -Input -+ Twisted pair Isolated Input Interface 10-48 VDC 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 IF2 and the input device. In this situation, the IF2 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. 86 IF2 Network Reader User Manual
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