Gerber D-200

Well I spoke too soon about having it fully functional. I can't seem to command the router motor to turn on/off. I knew the old control put 24v on pin-20, but that by itself is not enough. So after careful examination of the boards I went back and checked the signal from the old control on pins 20 and 22 with Halscope. It turns out when pin 20 goes high the control also outputs two short pulses on pin 22. There are also two pulses on pin 22 when pin 20 goes low and the router stops. I will post pics of the Halscope traces tomorrow.

How would be the easiest way to reproduce that signal?

Todd Zuercher wrote: How would be the easiest way to reproduce that signal?

linuxcnc.org/docs/2.7/html/man/man9/oneshot.9.html
and linuxcnc.org/docs/2.7/html/man/man9/timedelay.9.html

So, two oneshots. One triggered directly from whatever rives pin 20, and the other triggered by a timedelay triggered by the same thing.

You then need to or2 the two oneshot outputs.

Or a custom comp.

Thanks Andy, not sure why I didn't think of timedelay.

Here are the Halscope screen shots for anyone interested.

I ended up doing it a little differently, rather than using 4 components (2 oneshots, a timedelay and an or2) I did it with 2 edge components, both triggered by both rising and falling edges, the first one triggered by the spindle cmd, the 2nd by the 1st. The 1st edge I set the pulse width to the spacing of the 2 pulses, the 2nd the length of the individual pulses. and here is my result.



Now I just need enough time to go test it on the machine and see if it actually works.

Yes it works!

Here is what my breadboard rat's nest looks like.

This looks great! Thanks for sharing!

I also have an old D200 that I stopped using because of ArtPath. Were you able to successfully communicate with the D200 from LinuxCNC and cut a job? If so, how would I go about recreating this project so I can start using my D200 again with LinuxCNC?