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Ah I am with you now..

"Turn the axis by hand and read position from the screen under MACH3.."

Short answer is no..

There is no physical feedback for axis position to mach3.
The DRO...

That will give you 20mm on centres,,,IF you have the steps per unit length set up correctly in the motor config screens...and the accelleration and top speeds set appropriately so as to not miss...

Ahha that make sense.

The comms protocol on them is DH485 (AB version of RS485 with slight differences.)

Yup not a prob..
Always happy to help where i can...

I should hope so..
I have been programming them for the last 15-20 years!!! lol

For what you are thinking of doing then you will not encounter any issues with mismatched firmware revs.
Its only...

With that you should have absolutely no problems.
Just make sure that power is off before you plug modules in, and ensure the CPU is in the first slot next to the PSU.

That will not cause any problems unless there are specific functionality you are using in one card that may not be supported in another..

Most day to day tasks (just logic operators) then you will...

Hi James

I understand your argument that 4 is not 16...
However the Option_Reg prescaler is set to 1:4 so the chip is technically running at 4MHz anyway..

I have dabbled with PICs a fair bit...

Just delved a little deeper and....

The 16F628A on the parts list actually has a 4MHz internal oscillator..
Seems a little strange that this has not been exploited (then) especially when the...

Ah thats good to hear.

I have been looking at this for a while and was considering what would need to be done to transpose to a later PIC.
(fairly minimal by the looks of it - but that is without...

James

Just a thought..

Is there any reason this design doesn't use a PIC with internal oscillator??
I am assuming since the original design date they were not as abundant as nowadays..
...