Re: [Emc-users] Mesa 7i77 encoder max count rate

[Peter C. W. <pc...@me...>]

On Tue, 22 Dec 2015, Marius Alksnys wrote:

> Date: Tue, 22 Dec 2015 06:01:24 +0200
> From: Marius Alksnys <mar...@gm...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc...@li...>
> To: emc...@li...
> Subject: Re: [Emc-users] Mesa 7i77 encoder max count rate
> 
> Yes, filter was the first thing I tried. And it does not change max 
>count rate at this setup. I tried to play with muxed-count-rate, but 
>could not raise it more than 16666666. When I tried some bigger number - 
>the system just hang =|


changing the mux rate should not be able make the system hang (though if too 
fast it may scramble all the encoder counts vaues)

If the filter-rate setting does not change the maximum count rate,
the count rate limitation is not the 7I77 but something external
(possible the converter or the interface)


>I could not find how to change the skew while I found this mentioned in 
>forums. I am using standard Mesa cable, but can make shorter one, about 
>400mm length.


The skew setting HAL pin is only exposed with version 4 encoder counters


12/22/2015 05:41 AM, Peter C. Wallace raÿÿÿÿ:
...
> Did you try turning off the encoder filter bit?
>
> The limitation is because the 7I77 encoders are muxed. You can push up the mux
> rate with rev 4 encoders because they allow adjusting the multiplexing skew
> (from cable delays and switching times)


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Peter Wallace
Mesa Electronics

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