Re: Can some kind electronics bod help?

["Frank Mc Alinden" <armagh@xxxxxxx>]

Yes Please Paul

Just dont connect anything until we are pretty sure it wont fry your
boards...

Frank
----- Original Message -----
From: "Paul S. Gale" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, February 05, 2003 8:23 PM
Subject: RE: [ukha_d] Can some kind electronics bod help?


> Thanks Shane and Frank,
>
>
>
> I do have an owners manual which shows the connection of the keypads
and
> what each line is. Can I send it to both of you privately?
>
>
>
> I'm going to try emailing Kustom to get the detail I need - what
> questions do I need to ask them?
>
>
>
> Thanks very much for your help so far!
>
>
>
> Paul.
>
>
>
> -----Original Message-----
> From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> Sent: 05 February 2003 07:25
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Can some kind electronics bod help?
>
>
>
> Hi Shane
>                
On  the original post the guy mentions that the ocelet
> has
> open collector outputs and that the Kustom system  wqs looking
for 5v
> signal..So Paul has the same problem..if an opto is used ..Tie the
> collector
> to +5v via say 100 ohm resistor and connect the emitter to the zone
tx
> line.....Some connection diagrams might help??
>
> Frank
> ----- Original Message -----
> From: "Shane Harrison" <shane.harrison@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Wednesday, February 05, 2003 6:08 PM
> Subject: RE: [ukha_d] Can some kind electronics bod help?
>
>
> > See comments below
> >
> > > -----Original Message-----
> > > From: Paul S. Gale [mailto:groups@xxxxxxx]
> > > Sent: Wednesday, 5 February 2003 1:36 a.m.
> > > To: ukha_d@xxxxxxx
> > > Subject: RE: [ukha_d] Can some kind electronics bod
help?
> > >
> > >
> > > Yes - it seems that the Kustom amp is based on 5V IR
signals
> > > - how could I tell for sure without a scope? Would a
digital
> > > multimeter give an accurate enough reading on the IR
lines?
> > > (or should the IR output from the wall controller be the
same
> > > voltage as the supply voltage?)
> >
> > If you are lucky and the Kustom input has an internal pullup
> > (essentially a resistor to the power rail) then the input will
sit at
> > the power rail voltage when no signal is applied to it.  If
it has no
> > internal pullup then pretty hard to tell with out scoping the
the
> > existing IR signal being fed in.
> > >
> > >
> > >
> > > As both Kustom and HV seem to use 5V, should I just try
it
> > > without any electronics? Given they're both 5V could I do
any
> > > damage? Is all this talk of transistors not needed as
both
> > > systems run at 5V?
> > If the HV expansion board is open collector as Frank thinks, then
you
> > can't really do any damage if you connect them together. 
However with
> > open collector outputs (essentially it is a switch to ground
only,
> > either the output is grounded or not grounded (floating)) you
need
> > something to "pull" the signal up to a positive voltage
when the open
> > collector "switch" is not switched to ground. 
This can be an external
> > resistor (say 10K) or if you are lucky the Kustom has internal
pullups
> > as discussed above.
> >
> > HTH (and makes sense)
> >
> > Shane
> >
> >
> > http://www.automatedhome.co.uk
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>
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