Re: [CAD_CAM_EDM_DRO] Printer Port Voltage Problem. neeeed help

Roy,

One solution is to use Mach2 and the charge pump. The Sound Logic boards
that Jim Cullins manufactures uses the charge pump from Mach2 to disable the
step and direction signals going to the Gecko drives during power up. We
call it an anti chatter feature. If the user wires the EPO switch to our
board and then hits the big red button (EPO switch) during machine
operation, the board will inform Mach2 and at the same time it drop the 5
volts to the Gecko drive. Once Mach2 sees the EPO signal it will drop the
charge pump and inhibit the step and direction lines.

Bob Campbell
Bob@...
www.campbelldesigns.com
Breakout board
THC board sets
CNC router plans
Stepper Motors
VisualMill Basic

----- Original Message -----
From: "Roy J. Tellason" <rtellason@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, July 01, 2005 4:16 PM
Subject: Re: [CAD_CAM_EDM_DRO] Printer Port Voltage Problem. neeeed help


> On Friday 01 July 2005 11:51 am, shadi_salhab_78 wrote:
>> Hi all'
>>
>> I' am facing a problem with the printer port pins: When I start the
>> computer some pins randomly have 5V dc and others don't before
>> starting any program. If the pin is used for Step/Pulse input has 5V
>> the Rutex board dos not recognize it and no movement happen.
>> When I restart the computer the pins voltage randomly change and I
>> have to re-lock for the zero voltage pins to use them for Step/Pulse.
>> I faced this problem on Two different computers one is AMD and the
>> other is Intel . what should I do to solve this?
>
> That's a real problem all right. I'm not sure how others are dealing with
> this issue, and will be reading other replies with some interest, but
> from
> what I've read so far it appears to me that it's not a good idea to make
> any
> assumptions about what a printer port is going to be doing during powerup,
> self-test, and boot sequences. In whatever I end up building I'm going to
> have something in there to deal with this, only I haven't built it yet...
>
>
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