Contacts on digital caliper

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Contacts on digital caliper

Postby daemondust » Fri Mar 24, 2006 11:32 am

I just got the digital caliper you sell. It looks great. I've already solved a couple mysteries with it.

Anyway, I noticed that there're two platic covers. One has the battery in it, but the other just has four contacts. Before I go looking at these with a 'scope, does anyone know what these are for?
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Postby sparky » Fri Mar 24, 2006 11:54 am

I've seen CNC people hack them for slide positions. I though it was a PWM output or something similar...

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Postby SOI_Sentinel » Fri Mar 24, 2006 6:52 pm

It's an SPC interface. There's several different formats out there, but the big ones are Starret and Miyuto.

Here's the pinout of your scale (scroll down about halfway)

http://www.zietlowdesign.com/products/d ... manual.htm

Possible formats are discussed herein:

http://www.matronics.com/cncscale/

I'm betting on the Mitutoyo format, but who knows?
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Postby MGP » Tue Mar 28, 2006 3:03 am

Mitutoyo is the "800 lb. gorilla" in digital calipers and micrometers so I wouldn't be surprised either.
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Postby daemondust » Thu Apr 06, 2006 1:32 pm

From looking at the output with a 'scope it looks like it's sending out data in the Mitutoyo format.

Where can I find (or how can I build) an inexpensive cable to connect to this? I should be alright with the voltage conversions and reading the data.
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Re: Contacts on digital caliper

Postby sspence65 » Wed Oct 12, 2011 6:17 am

I bought the spc cable for my mitutoyo micrometer, but having great difficulties getting data from the unit. I was following http://www.sonsivri.com/forum/index.php?topic=29876.0 as a guide, but not seeing any data. Anyone else having some success?
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Re: Contacts on digital caliper

Postby sspence65 » Tue Dec 13, 2011 8:57 am

The solution was to ignore sonsivri.com. I now have my Arduino reading data from a Mitutoyo Micrometer. I've documented the process at http://arduinotronics.blogspot.com.
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