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How to connect encoder signals to VW3A3424 card if there are only A and B signals?

Published date: 27 June 2019

VW3A3424 can work with A, /A, B, /B signals or with A and B only or with A only.
The component signals /A and /B must be connected to encoder card either 0V or to V+. It depends on the type of encoder signals.
If encoder is push-pull type that provides A and B signal, then missing component signals /A and /B must be conencted to 0V
Likewise in open collector encoder if the output signals are of PNP type, missing /A and /B must be conencted to 0V.
For NPN type the missing /A and /B must be conencted to V+ of encoder card.

See highlight on extracted page from encoder card instruction sheet.
 

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