Re: [aclug-L] Info Request

[Jeremy S Johnstone <jsjohnst@xxxxxxxxxxx>]

NONNONON.... do not put +/- 5 Volts to the serial port

Use a transistor to raise the logically states up / down. If anyone needs
schematics just say so.

On 16 Sep 1998, John Goerzen wrote:

> Bob Deep <bobd@xxxxxxxxxxxx> writes:
> 
> > > >       Expanded support for PNP (I cannot wait for it).
> > > 
> > > We've already got this for PCI cards.  The ISA cards are a bit
> > > trickier, but it is there.  Kernel 2.2 will have nicer support.
> > > 
> > 
> > Yea, but the 2.0.34 way is kinda clunky and requires a bit of knowlage
> > about how the inards of your box work. Not that I mind being able to
> > control what IO address and interrupt my adapters use, just why should I
> > need to know if there are no conflicts?
> 
> To be fair, this applies only to ISA cards.  Every PCI card I've used
> (networking, SCSI, whatever) has had everything automatically set up
> properly with no need for me to specify any particular value.
> 
> > > Not quite sure what you mean here.
> > 
> > Neither am I...  I'm working on finding the specs for an automotive
> > applicaation, but have not had the time to find anything yet.  I'm sure
> > there are some data collection products for Linux too... Ahh  So many
> 
> Yes, Linux Journal talks about these regularly.  If you have something 
> that's simple, ie needing only an on/off value, you can build a custom 
> serial cable (pretty easy if you're handy with a soldering gun), and
> hook some of the on/off serial pins like DTR to your project, and
> control them via software.  If I remember correctly, the serial port
> uses values of + or - 5v DC for 1 and 0, but I may be way off on that.
> 
> > ideas, so little time and money...  Just wait... Somday I'll have my 71
> > Bug fully instermented and controlled by my lap top... Pitty the fool
> > who tries to start it without the laptop and proper passwords:} I'd just
> 
> Hehe :-)
> 
> > better look out because when the audio player is running and I'm trying
> > to download the latest kernel source as I am fighting the traffic on
> > Kellog and I run out of memory and swap space.... Well you get the
> > picture..  
> 
> Ahh, so THAT'S why the traffic on Kellogg is always so bad!  :-)
> 
> -- 
> John Goerzen   Linux, Unix consulting & programming   jgoerzen@xxxxxxxxxxxx |
> Developer, Debian GNU/Linux (Free powerful OS upgrade)       www.debian.org |
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