User`s manual

Chapter 5 — Using the IF30 GPIO Interfaces
IF30 Fixed Reader User’s Manual 75
Open Collector Interface
Using the Output Interfaces
Each IF30 output interface is optically isolated, polarized, and rated
for 5 to 48 VDC at 0.25 A. All IF30 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 the ground. Transient
suppression limits output voltage spikes to 65 VDC.
Since the outputs are optically isolated, each of the outputs can be
configured to switch the high or low side of the load. You can power
the load directly from the IF30 or from an external power supply.
In a typical application, the outputs control indicator lamps that
signal good reads or errors. These are the basic methods for
connecting external devices to the GPIO outputs:
• Switching the high side, with the load powered by the IF30.
• Switching the low side, with the load powered by the IF30.
+Input
+12 V
Ground
-Input
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 .25A
load
0 V 1 V 1.5 V