Fw: Re: Grounding IR cabling

["rectorydp" <dpullen@xxxxxxxxxxxxxxxx>]

Gareth

Ok. I didn't see any of the stuff about your problem before and it
does sound as if the shielded cabling helps so you can ignore my
interruption! I would have thought the LA PSU would be regulated. I
just thought I would mention the PSU as it would have saved you some
hassle.

I think Xantech suggest grounding the shielding on the Ground input
terminal. I believe you should only connect that end for each run.
They do also mention connecting a 470ohm 1/8 watt resistor between the
signal connection and ground when the shielded cable exceeds 50ft
(75ft when unshielded). Xantech state "The resistor discharges the
cable capacitance more quickly, allowing IR codes of high bit rates to
pass withough data loss for cosistent command executions."

Good luck

David

--- In ukha_d@xxxxxxx, Gareth Cook <g@u...> wrote:
> Well, I've changed the wiring to the IR Receiver in the lounge - and
> that's pretty much sorted it. That was part of a block of 12 CAT5
going to
> the lounge, and alongside whatever else was there in the cavity.
>
> The PSU used is the one supplied by LA for the Xantech block. I
think it's
> regulated - mebe Phil can shed some light on that.
>
> I would just like to see what the best way of grounding the shielded
> cabling is.
>
> G.
>
>  Gareth Cook
>  SWG EMEA North Account Manager
>  IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
>  Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
>  AIM Chat : TheBoyG - MSN Chat : chat@g...
>  email: g@xxxxxxx
>
>
> ----- Forwarded by Gareth Cook/UK/IBM on 10/12/2004 10:06 -----
>
> Discussion
> Main Topic
>
> "rectorydp" <dpullen@f...>
> Today 09:56
>
> .
> Subject:
> .
> [ukha_d] Re: Grounding IR cabling
> .
> Category:
>
>
>
>
>
> Gareth
>
> I ddn't see the message where you talked about the problem with your
> IR distribution so I am not sure if this will be helpful or not. I
> gather from what you say below that you have emitters that are
> constantly on. What power supplies are you using? I didn't have any
> problems with long runs of CAT5 between IR kit (up to about 35m) but I
> did have a problem like this with an unregulated power supply. As soon
> as I changed to a regulated supply the problem went away.
>
> BR
> David
>
>
> --- In ukha_d@xxxxxxx, Gareth Cook <g@u...> wrote:
> > I'm going to rewire all the IR receivers this weekend - the
screened
> CAT5
> > turned up (very fast from minitran)
> >
> > I'm using a Xantech dist. block with Buffalo receivers. I'm
assuming I
> > connect the sleeve earth wire at the dist. module (at node 0),
and do
> > nothing with the other end where all the receivers are. But, I
can
> connect
> > it to the cage, but the cage isnt earthed. Then will it follow
true I
> > should earth the cage ? Maybe a plug with the just the earth lead
> > connected and plugged into the mains (ala wrist strap) ??
> >
> > Hopefully this screened cable will get rid of this cursed
> constant-on the
> > IR system has.
> >
> > G.
> >
> >  Gareth Cook
> >  SWG EMEA North Account Manager
> >  IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
> >  Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
> >  AIM Chat : TheBoyG - MSN Chat : chat@g...
> >  email: g@xxxxxxx
> >
> >
> >
> > [Non-text portions of this message have been removed]
>
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