Re: IR systems, the choices

["Steve D" <steve@xxxxxxx>]

----- Original Message -----
From: Nikola Kasic
To: ukha_d@xxxxxxx
Sent: Wednesday, July 17, 2002 11:57 AM
Subject: RE: [ukha_d] IR systems, the choices

O.K.
I've got the picture. That means that you can even convert signals if
you
have 3 Sony TVs so you can send for Lounge Panasonic code for Volume+
and
your system will convert into Sony Volume+ and send in Lounge only. If
you
send Sony Volume+ it will not convert it but send to bedroom only. If
you
send Grundig Volume+, it will be converted into Sony Volume+ and send
into
Bedroom 2 only. For source, you'll need ideally, something like Pronto.

>>>You will be able to script the commands based on events, say if
you had a
sony tv in the bedroom, and you where in the bedroom and you put the
volume
+ the RX part of the unit would pick this up and then do nothing, as you
are
using the remote for the tv in the room, so you would not want this
command
sent else where. A pronto would be the best option to control each item
individually from one location.

Now, my question is how many wires you need for Tx, and how many for Rx?
You
are talking about Tx/Rx units, so it seems like a single unit.

>>>It is on a BUS network, so you need three wires going into the
unit, and
three wires coming back out, also you need 12 power to it, so thats an
extra
two wires.
Which totals 8

Will then single Cat5 be enough for connecting it?

>>> Yes, all patched back to a central location the right wires
connected up
so it's in a bus configuration and they have power, and one end of the
BUS
(three wires) being connected to a RS485 to RS232 convertor to a pc to
control the scripting.

How they must be placed to prevent looping?

>>>>They have inbuilt protection for this (or they will) and it
is all
scripted, so in theory you can protect it yourself using timers.

Where can I find those Tx/Rx units?

>>> Ian B is building and designing them himself, they are not off
the
shelf, and are a unigue specif design to accomadate the indvidual
addressing
ofr each TX/RX combo unit.

A saw them in many shapes on pictures on people's web sites. I would like
to
know if they can be flush mounted in an switch box, so I can put cable
in
place and cut boxes and cover them with blank faceplates, until I get
Tx/Rx
units?
Where can I buy them anyway? I see that they are mostly homemade. Can I
find
finished products anywhere?

>>>>See above

How your system topology looks like? You connect all the Tx/Rx units
into
your IR controller, I suppose, and then connect your controller via
serial
port to PC. Is that right?

>>>Yep pretty much as I see it. They are all sepereate nodes on a
3 wire
RS485 network which goes back to the computer to do most of the work,
this
enables easy progamming of them so you don't have to reprogram each pic
chip, which would take a while, and need good coding skills in C.

Cheers,
Nik


>>>>>HTH Steve
I am sure Ian B can correct me if I have got any of this wrong.

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