
Chapter 5 — Using the IF61 GPIO Interfaces
IF61 Fixed Reader User’s Manual 119
Switching the High Side Using External Power
To use external power (5 to 48 VDC) to switch the high side, connect
the Ground pin to the ground system of the external power supply,
and connect the positive side of the external supply to the +Output
pin. The external indicator lamp is connected to the corresponding -
Output and Ground pins as shown in the next illustration.
Switching the High Side With External Power
Driving a DC Relay to Control an AC Load
While the IF61 outputs are designed to switch DC loads, they can
drive relays that control AC loads. The next illustration shows how to
connect such a system to an IF61 output.
External
indicator
lamp
External
power
5-48 VDC
+
-
Ground
+Output
- Output
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