Re: [Emc-users] MESA 7i43

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

On Sun, 3 Jul 2011, andy pugh wrote:

> Date: Sun, 3 Jul 2011 22:36:52 +0100
> From: andy pugh <bod...@gm...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc...@li...>
> To: "Enhanced Machine Controller (EMC)" <emc...@li...>
> Subject: Re: [Emc-users] MESA 7i43
> 
> On 3 July 2011 21:26, Andrew <par...@gm...> wrote:
>
>> By the way, DMM requires 0...+5V input, and 7i48 has -10...+10V
>> output, it doesn't fit.
>
> I am fairly sure that you can make a 7i48 do 0-5v, simply by limiting
> the pwm duty cycle in HAL.

You certainly can but offset analog is a pretty dreadful interface. The DMMS 
lack of _any_ standard interface other than step/dir really suggests that open 
loop step+dir is the intended operational mode, and anything else will be 
quite awkward to do.



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Peter Wallace
Mesa Electronics

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