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Pin-Out Optical Encoder Question

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jasonlaw.28

New Member
Hi -

I am looking at this link: **broken link removed**

Under the Pin-Out section, it says:
1 Ground
2 Index
3 A channel
4 +5VDC power
5 B channel

What is #2, Index and what should I connect that to?

Thanks.
 
The index pulse can apparently be used if you want to detemine a "zero" position of the encoder.
 
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