Wiring 24V rotary encoder

Any hardware type questions or problems for all other Phidget devices.
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Wiring 24V rotary encoder

Postby nico_C » Mon May 21, 2012 3:46 am

Using phidgets 1057_2 Encoder HighSpeed, I wish to connect a rotary encoder, mounted on a testing machine, supplied with 24V, and whose outputs A & B are delivering 24V squared-waveforms. (datasheet: http://nicolas.charvin.free.fr/phidgets/HG650.pdf)

Phidgets 1057 works fine with the 3530 encoder, which is powered through USB and the Phidget board, and waveform A (or B) goes from 0.8V to 5.2V. Then, I can monitor rotation using supplied software.

Using a 24V benchtop power-supply and a simple resistor-based voltage divider (see: http://nicolas.charvin.free.fr/phidgets ... Forums.jpg), waveforms goes from 0V to 4V. But nothing is detected using supplied software.

(Note that with this setup, it works using a NI-6225 USB daq board).

I guess I miss something about ground connection, and I need some help.
Thanks in advance.


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Re: Wiring 24V rotary encoder

Postby erik » Tue May 22, 2012 8:52 am

The issue could be that there is no common ground between the USB device and the encoder. Try attaching the ground wire of the 24V power supply to the ground pin of the connector on the 1057. The pins are labelled in the product manual for the 1057.

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