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{scroll-pagetitle}Digital Inputs{scroll-pagetitle}
h1. Digital Inputs

The FAC-2100 has ten total digital inputs with following capability:
* Eight _Standard Digital Inputs_ that can read a wide voltage range which includes 200VDC and 120VAC signals.
* Two _Universal Digital Inputs_ that can read digital waveform signals with voltages up to 28VDC.  These channels allow the FAC-2100 to read frequency and duty cycle and can be paired for quadrature decoding.


h2. Basic On/Off Mode

Both the _Universal_ and _Standard Digital Inputs_ can read in basic on/off mode.  In this mode the controller determines if the input signal is present or not.


h2. Frequency and Duty Cycle Measurements
_Universal Digital Inputs_ can process a waveform and determine the signal's frequency and duty cycle.


h2. Quadrature Decoder
Signals that are quadrature encoded provide direction and speed of an attached sensor from two signals (typically called Channel A and Channel B).  The _Universal Digital Inputs_ can be used as a pair to decode these types of signals with Channel A going to D{~}UIN1{~} and Channel B to D{~}UIN2{~}.  

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If the quadrature encoder output is using a driver such as an RS-485 or RS-422 transceiver, it is recommended that each D{~}UIN+{~} and D{~}UIN-{~} signals be terminated with an impedance that matches the transmission line.  To accomplish this, install a resistor (typically around 120 ohms) across both the D{~}UIN1{~} and D{~}UIN2{~} plus and minus terminals.


h2. Wiring
Each digital input channel consists of an opto-isolated LED / transistor pair with a dynamic drive circuit that permits a wide input voltage range to be applied.  Each of the modes described above utilize the same wiring configuration.


{scroll-align-center}!Installation - Din Switch.png!
{*}Suggested Digital Input Wiring to a Mechanical Switch{*}{scroll-align-center}


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Notes: The suggested wiring above uses digital input 1. Any digital input could be wired in a similar configuration.  Also, because the digital inputs are opto-isolated, the circuit could have been wired with a jumper between pins b and J with wires from K and c connecting to the switch.



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