Yes! But you can only go one way, not both on the same data line. If that's not
a problem, go for it.
Rick

Tal Bejerano - AMC wrote:

> Rick
> After I post message I thought that using Opt coupler on each in/out pin can
> defend the port pretty good.
> don't you think so?
>
> Tal
>
> -----Original Message-----
> From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of Rick C.
> Sent: Thursday, February 21, 2002 1:31 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: protecting parallel port
>
> Parallel ports are somewhat "robust". I "think" the data lines have series
> resistors to prevent shorts in the printer cables from destroying the pio
> drivers. Since some port lines are bi-directional, you can't really buffer
> them. If you want to be really protective, you could install an interface
> that
> would have each data line strapped with diodes to prevent voltages over +5
> volts and under 0 volts from destroying your pio chip. Cathode to +5, anode
> to
> data, and another cathode to data, anode to ground. Do this on all data and
> printer status lines. This will also supress "some" static electricity from
> eating up your pio chip. I believe +5 volts is on the db25 too.
>
> Rick
>
> Tal Bejerano - AMC wrote:
>
> > Hello 2 All
> >
> > I want to do some experiments with my pc parallel port.
> > How can I protect it in the easy way not to burn it if I do any mistake or
> > short circuit?
> >
> > Thanks
> >
> > Tal
> >
> > --
> > http://www.piclist.com hint: To leave the PICList
> > mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu