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Chapter 5 — Using the IF2 GPIO Interfaces

IF2 Network Reader User’s Manual 75

Using the Input Interfaces

Each of the four inputs is compatible with input signals of 10 to 36

VDC. Both the high and low signal contacts are exposed and isolated

to 1500 V. Input impedance is 1.8 K ohms minimum.

In a typical application, the IF2 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 IF2 input

interfaces:

• Supply the input interface with power from the IF2.

• Isolate the IF2 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.

IF2 Powered Input

This is the simplest way to connect a control to an IF2 input interface.

If the external control device is a switch, you can connect one side of

the switch to an IF2 +Input pin, and the other side of the switch to

one of the +12 VDC sources. Ground the corresponding -Input pin as

shown in the next illustration.

GPIO Input Signal Descriptions

Signal Description Min. Typical Max.

(High) High input voltage 10 V 24 V 36 V

(Low) Low input voltage -1 V 0 V 1 V

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 103 104

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