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Position sensor with Pulse interface

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#1 evendol

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Posted 12 March 2013 - 12:54 PM

Hi, I am trying to replace a SSI sensor with a lower cost sensor that has the more basic PULSE interface. After giving a init signal the PULSE interface sensor gives a start signal and after a certain time a stop signal will be given. The time between start and stop signal is proportional with the distance measured by the Position sensor. As the resolution is 0,000002m and the maximum measure length is 1m I will need at least 500.000 pulses for maximum length. Reading this sensor could take max 0,2 seconds so I would need 2,5 MHz clock to read this sensor. Is anyone familiar with reading this kind of sensor? Could the Labjack counter be used? See attached .pdf of BALLUFF and ASM sensors. Best Regards, Evendol

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#2 LabJack Support

LabJack Support
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Posted 12 March 2013 - 04:10 PM

Looks like a good application for a Timer in Period Measurement mode 2. You would configure and zero the timer, then use a digital output to send the start pulse, then read the timer value.

One thing I notice is that the signals are RS485 style differential, but the LabJack has single-ended digital I/O. Ask the sensor manufacturer if you can short INIT- and STSP- to ground. If not you need a line driver a line receiver. I see related info here:


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