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Chapter 5 — Using the IF61 GPIO Interfaces

IF61 Fixed Reader User’s Manual 115

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 minimum.

In a typical application, the IF61 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 IF61 input

interfaces:

• Supply the input interface with power from the IF61.

• Isolate the IF61 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.

IF61 Powered Input

This is the simplest way to connect a control to an IF61 input

interface. If the external control device is a switch, you can connect

one side of the switch to an IF61 +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 ... 124 125 126 127 128 129 130 131 132 133 134 ... 151 152

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