Re: Parallel port

[Jon Elson <jmelson-at-artsci.wustl.edu>]

JohnDRoc-at-aol.com wrote:

> Will,
> I hope you're feeling better now!  I think you're right - it wasn't compiled
> correctly.  I have the June EMC (RH6.0, RTL2.2) up and running (kind of) and
> it seems to be doing a lot that May wasn't.  I think I have a pretty solid
> build going now (I hope).
>
> On a separate subject (I copied this to the EMC group, in case anyone has
> similar experience)...
>
> I spoke to Fred yesterday about the STG2 board and the fact that I was
> getting min/max limit errors when I had the polarities set at 0 and no limit
> switches hooked up.  I FINALLY got the Y axis on the Milltronics to run.  I
> got it to jog back and forth at different speeds, which was definitely cool,
> but the amplifier boards are a pain in the wazoo!  When EMC is not in
> "Machine On" mode, the axis tends to "drift."  There is an "axis disable" on
> the board, but I couldn't get it to work right with the STG2 Amp enable
> output.  I think it has to go to ground instead of a voltage which means that
> I'll have to hook them up to a relay.  My question is about the Amplifier
> Fault and Limit Switch inputs.  I've got them all tied to ground, but I still
> get occasional Amp and Limit errors.  When I do, I can't get them to reset or
> Limit override or anything.  I have to go into the .ini file and actually
> change the polarity - it's almost like a toggle switch.  I'm tempted to go in
> and hard code the values to null and just hook a relay up to limit switches,
> which would disable the amp boards and give a following error.  I would kind
> of like to know if it is a bug where the variables aren't being reset, or if
> I have it hooked up wrong.  If I can figure out the amplifier set-up, I'll be
> good to go!  Thanks.

My guess is that floating inputs are wavering between logical zero and one.
You might tie these fault inputs to ground (or VCC, consistant with what
you eventually plan to have the polarities set to) and see if you can get
them to not come and go.

Jon