User`s manual

Chapter 5 — Using the IF30 GPIO Interfaces

76 IF30 Fixed Reader User’s Manual

• Switching the high side, with the load powered externally.

• Driving a DC relay that controls an AC load.

Switching the High Side Using IF30 Power

In this example, an external indicator lamp with a 0.25A maximum

current is connected to the -Output and Ground pins, and the

corresponding +Output pin is connected to the +12 VDC source.

Switching the High Side

Switching the Low Side Using IF30 Power

For low side switching applications, the lamp is routed to all the

lamps in common and the low side of the load is routed to the switch.

In this method, connect the external indicator lamp to the +Output

and +12 VDC pins, and short the corresponding

-Output pin to ground as shown.

Switching the Low Side

External

indicator lamp

0.25A maximum

+Output

+12 V

Ground