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Quad Mode, rotating direction


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#1 Chris_D

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Posted 16 July 2012 - 06:02 AM

Hello, i have a problem with Quad Mode of my U3. I have connected wire A and B from a rotary encoder to FIO4 and FIO5. Now, in one direction everything is fine. A read Timer0 and he counts from 0 to -1440 (a full revolution). But if I turn in the other direction, the value rests. It seems that he counts A positive and B negative because the value changes quite a few times (from -1440 to -1439 to -1440). I also tested the LJControlPanel, same problem. Do you have any idea? Thanks for your help.

#2 LabJack Support

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Posted 16 July 2012 - 08:28 AM

What other connections do you have with the encoder (e.g. ground and power supply)? Please provide a link to electrical specs for the encoder.

#3 Chris_D

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Posted 17 July 2012 - 02:52 AM

Hi, it's a torque sensor with a rotary encoder. Pin 1 Excitation (+) 12 ... 28 V DC Pin 2 Excitation (GND) 0 V Pin 3 Signal (+) 5 V Pin 4 Signal (GND) 0 Pin 5 Calibration control L <2,0 V; H >3,5 V Pin 6 Option angle A TTL Pin 7 Option angle B TTL Pin 8 NC But now, it works fine. I didn't connect the torque pins (pin 3 and 4) , so GND missed. Thanks for your food of thougth.


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