[How do I?] Oscilloscopes & Logic Analyzers

The iGaging DRO scales are compatible, but the new iGaging Absolute one are not apparently.
Only thing I can figure is some sort of design change.
Has something to do with a different clock speed.
Also the data lines are attenuated with a 5.6K PD resistor, not sure why this is or how it would require a change to the controller.
 
mws
I have never seen the igaging absolute model so it is pure speculation on my part, but I suspect they have not deviated from their previous models all that much.
The previous models have a usb plug but that's where it ends, they do not use the usb standard at all, it is a bit more like I2C standard where the master drives a clock line while the slave drives the data line however it isn't I2C either since there is no addressing. I suspect that the only changes would be in the analogue domain (as you put it).

Secondly you are incorrect in the assumption that Yuris mod will give you a quadrature output, this it does not. The hardware that Yuri uses takes in the electronic signals from the scales and interperates it into a value that the scale sent it then sends that raw value to the tablet using RS232 serial coms. The tablet converts the raw value into inches or mm based on the steps per inch which you provide as part of the calibration.

The serial comms to the tablet takes the form of :
X123456 Y123456 Z123456 W123456
It is a simple protocol but it works well.

Sent from my GT-I9505 using Tapatalk
 
arvidj said:
I'm not sure if this link offers any information that was not previously discussed or not.
Click to expand...

That's a write-up on the older, original iGaging scales, but thanks.
 
atunguyd said:
Secondly you are incorrect in the assumption that Yuris mod will give you a quadrature output, this it does not. The hardware that Yuri uses takes in the electronic signals from the scales and interperates it into a value that the scale sent it then sends that raw value to the tablet using RS232 serial coms. The tablet converts the raw value into inches or mm based on the steps per inch which you provide as part of the calibration.
Click to expand...

Thanks for that clarification. Yes, I assumed that the scale only provided a lead-lag pulse train and the display did everything else.

I just ordered new glass scales for my new (to me) milling machine, Since I have the scales left over from it's smaller predecessor I'm going to add a fourth scale to the quill. There's a fellow in the UK who sells a nice little scale combiner so the two (knee and Quill) Z axis scales can work together.

IOW: It's nice just being able to plug-n-play with these things.
 
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Yes I guess making a small arduino (or any other small micro) circuit that adds rheumatoid values of two scales and then outputs as one quadrature output would be a relatively simple process of you are experienced with embedded software.

For the record yuris system supports exactly what you want to do. The w Axis is a summed with the z Axis in the tablet.

Sent from my GT-I9505 using Tapatalk
 
FYI, there is a post on Yuriy's blog from a gent stating they have decoded the protocol for the
Absolute scales, and that they can be used without hardware changes. It'll be interesting to
see how it plays out...
 
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