At 07:28 PM 9/24/2003 +0100, you wrote:
>On Wednesday 24 Sep 2003 6:11 pm, you wrote:
> > Ian Bell wrote:
> > > On Wednesday 24 Sep 2003 4:17 pm, you wrote:
> > > > How do they get away with this?
> > > >
> > > > They have an RS232 line going into a digital I/O port using just a
> > > > couple of resistors.
> > > >
> > > > Also, the 7404 as a line driver. How much cable and speed is that good
> > > > for?
> > >
> > > That's bloody criminal.  Note they have two 7404s in parallel.
> > >
> > > Ian
> >
> > Still, do they actualy *say* it's a **RS232** interface ?
> > I could not see that...
> > The only RS232 reference I could find was a RS232 *connector"
> > on the lab-board you can buy as an option.
> >
> > If they should be critizised for anything, it shold be
> > that they do not *clearly* say that it's *not* a RS232
> > interface...
> >
> > What am I missing ?
> >
>
>That elsewhwere they say it can be connected to a PC serial port (which IS
>RS232)

You can connect the 120 (or 240) VAC mains to a PC serial port,
doesn't mean you'll be happy with the results.  ;-)

BTW, the triple inverter has 5V-tolerant inputs with ~7V protection zener
on the inputs. Here's the actual data sheet:
http://www.toshiba.com/taec/components/Datasheet/7WH04DS.pdf

I'd consider this adequate for a programming interface on a desktop, but
would not like to see it used for other purposes. They don't have a lot of
room on that product for a "proper" interface, even using ceramic caps.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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