re: Stepper motor transition board

[RIVERS@BNLX26.NSLS.BNL.GOV (Mark Rivers)]

From:	SMTP%'mooney@oxygen.aps1.anl.gov' 30-MAR-1994 17:42:51.88
To:	RIVERS@BNLX26.NSLS.BNL.GOV
CC:	
Subj:	re: Stepper motor transition board

Date: Wed, 30 Mar 94 16:43:07 CST
From: mooney@oxygen.aps1.anl.gov (Tim Mooney)
Message-Id: <9403302243.AA06148@oxygen.aps1.anl.gov>
To: RIVERS@BNLX26.NSLS.BNL.GOV
Subject: re: Stepper motor transition board


Mark, re... 

> If you do end up laying out a new board I would like to suggest the following:
> 
> - Include 1 uf capacitors between each of the limit switch lines and  ground.
> These will eliminate glitches on the limit lines. These can be  a real
> problem, at least when used with E500 controllers. I don't know  if the OMS
> controllers are any less sensitive to these glitches. 

We had problems with OMS and StepPak until we put caps across limit lines

> - Provisions be made to optionally allow the motor  pulse signals to be
> brought out to BNC or LEMO connectors on the front of  the transition board.
> This will make it easy to use the motor pulses to drive the channel advance
> signal of a multichannel scaler, as we did in our scanning microscope demo. 
> 
> - Provisions be made for optional circuity to convert the  pulse/direction
> output of the OMS board to pulse/pulse (CW/CCW). This would allow the OMS
> board to drive controllers which require pulse/pulse, for example the Klinger
> DC motor driver module.
> 
>                                    Mark

I suggest we implement DIP jumpers into and out of a breadboard area
(which would be most of the board area) so these and other user
modifications are convenient.  Also, I suggest all signals be buffered
with commonly available chips, and that output lines use chips with
pin-compatible open-collector and bipolar versions.  The OMS card does
this for step/direction lines using 7404/7406, but limit-switch lines
go directly into a PAL programmed by OMS.

Tim