Encoder wiring - how to test and hook up.

jeffjohnvol

I have an encoder,· series TRD-S/BD.· I'm trying to manually test it with a volt meter.

The specs are:

Operating voltage:·· 10.8-26.4vdc· (I'm using 24 volts)
signal format:········ ·Quadrature output
Output config:········ N channel mos FET.· Open drain output

Output voltage:······ "H"·

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··························· "L"· 0.4 V or less


Wiring:
· Blue:····· 0 v
· Brown:·· Power Supply (24 volts for me)
· Black:····OUT A (100 pulses per rotation)
· White:·· OUT B (100 pulses per rotation)
· Orange: OUT Z (1 pulse per rotation)

Link: http://web5.automationdirect.com/static/specs/encoderld.pdf

The output wave form I was expecting was to be between 0 and 24 volts, but the "H" value of "

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" in the specs has me a little confused.· Can anyone advise me how I can test this out, and if you know, how I can hook this thing up to my stamp?· BTW, I'm using the Stamp PLC so 24 volt inputs are okay.

When I hook things up and measure, I don't get any appreciable measurement on the volt meter.· Do I need to apply a load?

Thanks.
Jeff





Post Edited (jeffjohnvol) : 5/19/2007 7:56:50 PM GMT

Phil Pilgrim (PhiPi)

You need pullup resistors from OUTA, OUTB, and OUTZ to whatever power source powers your logic. For the BASIC Stamp, that would be Vdd (i.e. 5V). Also, connect the Blue lead (0V) to Vss. Then you should be able to see the signal levels you were expecting.

-Phil

jeffjohnvol

That did it. I used a 10K ohm and 24 volts since the carrier board I'm using uses 24 volt optoisolated inputs (http://www.parallax.com/dl/docs/prod/indl/StampPLC.pdf).

Thanks!