Experimental Physics and
Industrial Control System

---------- Forwarded message ----------
Date: Wed, 15 Dec 1999 18:45:11 -0500
From: Al Grippo <[email protected]>
To: Leonard J. Reder <[email protected]>
Cc: [email protected]
Subject: Re: GreenSpring IP488 Industry Pack Support and New Focus 8732 
    Controller

"Leonard J. Reder" wrote:

> Hi,
>
> A colleague is looking into using a picomotors for optical alignment.
> We are interested in knowing if anyone has developed EPICS device
> support
> for the GreenSpring IP-488 industry pack module and the New Focus
> 8732 multi-axis pico motor controller.  The New Focus controller is
> a GPIB device and special commands are required to be sent to the
> picomotors for positioning.
>
> Also just support for the IP-488 module would be useful.  Also have
> any of you had particularly bad experience with the Greenspring IP-488
> module.  I would be interested in knowing about potential problems
> with utilizing GPIB.
>
> Any and all replies are greatly appreciated.
>

     I have written GPIB device support for the 8732 picomotor driver
using the IP-488 interface. We have used it successfully for the past
2 years to control >20 motors, most of which are moved quite frequently
when
running beam. The only problems experienced were an occasional "runaway"
picomotor (keeps going even though you only command a few steps)
and conflict with OMS driven steppermotors (solved by putting them on
a separate ioc).  Fixes were made by New Focus for the runaway
problem; it now seems to be confined to one particular channel,
so this may be simply a bad hardware channel. We switched
channels, but haven't had enough experience yet to know if this
solves the problem.

                         -Al Grippo

--------------------------------------------------
   Al Grippo/ Computer Scientist/ TJNAF
   Newport News, VA/ 757-269-5015/ [email protected]
--------------------------------------------------

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