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Chapter 5 — Using the IF61 GPIO Interfaces

IF61 Fixed Reader User’s Manual 117

Open Collector Input Interface

Using the Output Interfaces

Each IF61 output interface is optically isolated from the IF61,

polarized, and rated for 5 to 48 VDC at 0.25 A. All IF61 outputs

include internal thermal fuses that trip if the load exceeds 0.25 A, and

the fuses are self-recovering once the excessive load is removed. The

high and low contacts are exposed and isolated from ground.

Transient suppression limits output voltage spikes to 65 VDC.

Because the outputs are optically isolated, each one can be configured

to switch the high side or the low side of the load. You can power the

load directly from the IF61 or from an external power supply.

In a typical application, the outputs control indicator lamps that

signal good reads or errors. The basic methods for connecting

external devices to the GPIO outputs include:

• Switching the high side, with the load powered by the IF61

• Switching the low side, with the load powered by the IF61

• Switching the high side, with the load powered externally

• Driving a DC relay that controls an AC load

+Input

+12V

Ground

- Input

GPIO Output Specifications

Signal Description Min. Typical Max.

Leakage

current (High)

Switch output, high leakage

current

0 mA 1 mA 10 mA

sat

(Low) Switch output on, saturation

voltage with 0.25A load

0V 1V 1.5V

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