Re: [aclug-L] Info Request

[Jeremy S Johnstone <jsjohnst@xxxxxxxxxxx>]

USB is still way off for linux but it supports a theoretical 127 devices
with 12mb bandwith. I personanly have designed a device that uses the
parallel port. It can read up to about 10 devices on each parallel port
and since the parallel port does not capture the irq you can put multiple
paralllel ports on the same irq as long as the io's are different.

On Wed, 16 Sep 1998, Bob Deep wrote:

> Jeremy S Johnstone wrote:
> > 
> > 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.
> > 
> 
> Yea, could cause bad things to happen...
> 
> I think I'd use a printer port and some latches myself, though the
> serial approach is something I had not thougt of.  Most of my problem
> will be getting data in to the control program.  Small analog signals
> are rough to deal with in a noisy auto enviroment, and some of the
> sensors may be hard to place. (Head temps, cam position, manifold temp,
> pressure etc...) Most of the outputs are fairly simple on-off type
> things and are usually large signal.  (Timing advance, fuel injectors,
> field currents and such).
> 
> How about USB?  Does it offer any advantages aside from not burning an
> interrupt per device?  What is the effective bandwith available?  Does
> Linux support it yet?
> 
> -= bob =-
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