Chapter 5 — Using the IF61 GPIO Interfaces
IF61 Fixed Reader User’s Manual 117
Using the Output Interfaces
Each IF61 output interface is optically isolated from the IF61,
polarized, and rated for 5 to 48 VDC at 0.25A. All IF61 outputs
include internal thermal fuses that trip if the load exceeds 0.25A,
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
These methods are shown in the next examples.
GPIO Output Specifications
Signal Description Min. Typical Max.
Leakage
current
(High)
Switch output, high
leakage current
0 mA 1 mA 10 mA
V
sat
(Low) Switch output on,
saturation voltage with
0.25A load
0V 1V 1.5V
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