How acquire Encoder have z Low A & B High?

[eng.tam]

I am working on Labview 8.5 with  NI USB-6259 and i have a quadratic encoder where Z is Low and A-B are High , as i understood that Labview can acquire A and B High or Low but not For Z pulse. Is there is a way to solve this problem?

As matter of fact also that Z pulse saturated at 1.7 volt and on at 0 volt. B and A are always zero and the on is 5 volt.

Thanks

Tamer Badawy

[Mark_SAI · Accepted solution]

Hello,

From what I understand, you have labVIEW acquiring the A and B pulses from your quadrature encoder, but it won't detect the Z input.

If not, have a look at this article,

Also on Page 7 of the USB-6259 datasheet it says the minimum input high voltage is 2.2V, so your 1.7 volt Z pulse is not enough to meet the specification! So it is likely to not work, so I suggest a circuit to level translate your 1.7volt signal to 5v, and then you might have better luck detecting it

I hope this helps!