Intermec IF61 GPIO Terminal Block User's Guide - Page 13

The input terminals access the four general purpose inputs on the reader. Each of the inputs is compatible with input signals of 10 to 48 VDC. Each input terminal includes a green indicator LED that lights up when the input circuit is energized. Reader Interface Reader CPU 12 VDC - + +12 V +Input -Input Ground Input Terminal Schematic: This illustration shows a reader input terminal. The -Input post is shorted to the Ground post by a jumper. How the inputs are used depends on the RFID application being used in the system. Typically, the reader senses input from an external control like a switch and then starts a Read operation. You need to coordinate the wiring of input controls with the software developer. There are three ways to connect input controls to the terminal block: • Supply the input interface with power from the reader. • Isolate the reader from the input power source. • Use an open collector solid-state drive from a remote device to control the inputs. For more information, see the next examples. GPIO Terminal Block User's Guide 13