2009/12/12 Kirk Wallace <[email protected]>:

> Just in case, here is a sample config using step type 9:
> http://www.wallacecompany.com/machine_shop/Shizuoka/emc2/configs/ST-N_current/

There is a description of the stepgens here:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?action=browse&diff=1&id=Stepgen
It looks like Martin would want a type 10 for his bipolar drive, but
that is a small change.

> In reviewing the .hal file, I remembered that with four phases and a
> drive enable for each axis, at least two parallel ports and buffer cards
> are needed.

There are 12 outputs, so indeed only enough for the phases on a
3-axis. I guess that you could hard-wire the amp-enable lines though
(And I didn't see any sign that Martin's drive had a separate one, it
might be built into some other part of the system)

But yes, the pin-count of a single parallel port is rather too tight
for this application. PCI Parallel cards are reasonably cheap on that
eBay, though, and he should be able to try a couple of axes as a
feasibility test.

-- 
atp

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