On Mon, 22 Mar 2010, Kirk Wallace wrote:
> Date: Mon, 22 Mar 2010 08:30:28 -0700
> From: Kirk Wallace <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] SSI Absolute encoders HM2
>
> On Mon, 2010-03-22 at 09:31 +0100, Lars Levin wrote:
>> Hello group!
>>
>> I have servodrives with the ability to use them in SSI absolute
>> encoder mode.
> ... snip
>> I am really interested in testing this on a gantry system and by using
>> SSI getting rid of the homing problem in a gantry system, when the
>> axes know exactly where they are when you start up the system.
> ... snip
>
> In case you haven't seen what I have done with my SSI encoder, my files
> are here:
> http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/
>
> I use a parallel port for I/O. The .comp file does the magic by
> bit-banging the clock and reading the input on each thread pass. This is
> pretty slow, about 23 milliseconds per word. I could probably put the
> encoder .comp in a faster thread, but from my SPI DAC work, the standard
> base thread is too fast. You might be able to do some testing with this
> setup, but it may not be fast enough for the production version. If you
> have the datasheet on your encoder, the my encoder.comp may be massaged
> to work with yours.
> --
> Kirk Wallace
> http://www.wallacecompany.com/machine_shop/
> http://www.wallacecompany.com/E45/index.html
> California, USA
>
Normal SSI encoders have a ~20 usec timeout on clock so bit banging them is
probably not going to work. In addition, since the data is being used for
servo feedback, extra readout delay is not a good thing. The SSI clock is
commonly in the range of 100 KHz to a few MHz
Peter Wallace
Mesa Electronics
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