Intermec IF30

Chapter 5 — Using the IF30 GPIO Interfaces
78 IF30 Fixed Reader User’s Manual
Driving a DC Relay to Control an AC Load
While the IF30 outputs are designed to switch DC loads, they
can drive relays that control AC loads. The illustration on the
next page shows how to connect such a system to an IF30 output.
Driving a DC Relay: The external relay provides dry contacts for controlling
the AC motor.
Using the Power Interface
The IF30 GPIO interface provides 12 VDC at 0.5A for powering
external inputs and loads, eliminating the need for an external
DC supply and simplifying the system installation.
The GPIO interface power has an internal thermal fuse that trips
if the load exceeds 0.5A. The fuse is self-recovering once excessive
load is removed.
The total load on the GPIO interface power must stay within the
0.5A limit.When you design a system that uses the GPIO
interface power, be sure to complete a power budget assessment
to ensure that the supply is adequate for the system.
If your system needs more than +12 VDC at 0.5A, you can
connect to an external power supply to the +12V and Ground
pins. The external supply powers the external loads, and that
power will be available at all +12V pins on the control port.
AC motor
120-230
VAC
External
relay
+ Output
+ 12V
Ground
- Output
Note: In many installations, the relay and AC wiring must be
placed in an enclosure that meets local fire code regulations.