User`s manual

Chapter 5 — Using the IF30 GPIO Interfaces
IF30 Fixed Reader User’s Manual 73
Using the Input Interfaces
Each of the four inputs is compatible with input signals of 10 to 48
VDC. Both of the high and low signal contacts are exposed and
isolated to 1500 V. Input impedance is 1.8K minimum.
In a typical application, the IF30 senses input from an external
control like a switch and then starts a tag read operation.
There are three basic ways to connect input controls to the IF30 input
interfaces:
• Supply the input interface with power from the IF30.
• Isolate the IF30 from the input power source.
• Use an open collector solid state drive from a remote device to
control the inputs.
IF30 Powered Input
This is the simplest way to connect a control to an IF30 input
interface. If the external control device is a switch, you can connect
one side of the switch to an IF30 +Input pin, and the other side of the
switch to one of the +12 VDC sources, then ground the corresponding
-Input pin.
GPIO Signal Input Descriptions
Signal Description Min. Typical Max.
V
in
(High) High input voltage 10 V 24 V 48 V
V
in
(Low) Low input voltage -1 V 0 V 1V