Re: Re: pic-servo & EMC

A few point about the PIC Servo.
1. The PIC Step adapter will work with the parallel port tho it seems to
slow down quite a bit.
I was lucky to get 300 RPM's on a 486-33sx with the parallel port adapter.
With serial I could get 3000+ with good control.
2. The PIC servo board from JR Kerr was only a 2 A output tho there are
connections for other amplifiers.
Dan
-----Original Message-----
From: Fred Proctor <proctor@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Monday, July 19, 1999 3:05 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: pic-servo & EMC

>From: Fred Proctor <proctor@...>
>
>Andrew Werby and Andy Olney were discussing the PIC-Servo and using it
>in place of the Servo To Go board for the EMC. I have been referring to
>the STG board as a "dumb" IO card since it has no CPU or other chips
>that do any calculations. It's just a board with an ISA bus interface to
>digital-to-analog converters, encoder quadrature counters, and some
>digital IO. It doesn't do any PID calculations, trajectory planning,
>etc. like full-featured motion control boards (e.g., Delta Tau PMAC,
>Galil DMC-1000).
>
>The PIC-Servo sounds like it does what the STG board does, plus some
>servo calculations. Some boards are in this category, where they use a
>small chip for the PID calculations. This puts it in the "smarter"
>category, but it still lacks the full-blown motion control of the Delta
>Tau or Galil.
>
>One easy way to use the PIC-Servo is to simply read its encoder counter
>and write its DACs, bypassing any calculations. If the PIC-Servo only
>has a serial interface this can get messy. I haven't done any serial
>port programming in RT-Linux, but others have.
>
>--Fred
>
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