Re: [Emc-users] Machmaker USB -> Parallel

[Bari <bar...@gm...>]

On 7/23/20 2:23 PM, John Dammeyer wrote:

> And it's still USB.  Can it handle a 2500 line quadrature encoder?   The control is the small part of the overall CNC conversion.  I found that buying the CNC Cape for the BeagleBone  which all around seemed like the lowest entry cost ultimately wasn't cheaper and it's sitting in a box.

This is not for closed loop servo that moves at a high speed. They 
likely just USB to LPT and reference a clock on the LPT side to Step and 
Dir for open loop.

"- Inputs read - reaction to any input status change. Not more often 
than every 20 ms."

So the minimum that the state can change on quadrature is 20mS.