Re: [CAD_CAM_EDM_DRO] Interfacing EMC with Bandit drives

Jon Elson wrote:

> Jack Ensor wrote:
>
> > There are 5 input signals to the Bandit driver. The position signal
> > input consists of 4 opto-isolators. A move signal is coupled to the
> > 5th opto-isolator which terminates the hold mode. After the move
> > signal is goes to zero, there is a 5 second delay via a 555 timer
> > before it reduces the current to the hold level.
> >
> > The step signal sequence into the two channels is as follows:
> > A B
> > 01 01
> > 01 10
> > 00 10
> > 10 10
> > 10 00
> > 10 01
> > 00 01
> > repeating beginning with 01 01

I think you left out a state in this table, I have rewritten it, and provided
a circuit to make the conversion at :
http://ascc.artsci.wustl.edu/~jmelson/stepdir.html
Look in the half step link there. I also show a simpler circuit to make
full step phase signals from step-direction signals. Both of these could
be reduced to single chips with CPLDs.

Jon