Re: Re: DMX Controller

["Mal Lansell" <mlansell@xxxxxxxxxxxxxx>]

Random switching means you can turn it on at any point in the AC cycle -
meaning you can do dimming (as far as I'm aware, SSRs all turn off at zero
crossing, so it's the on point you get to control).

Mal

----- Original Message -----
From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Tuesday, November 23, 2004 6:58 AM
Subject: Re: [ukha_xpl] Re: DMX Controller


>
> Hi Lehane
>
> >The better ones don't need repetetive
> > sending of the DMX settings but use bigger PIC's like the 18F452.
>
> From the specs i read that one doesnt require software refreshing so
maybe
> it has a 18F252 ...
>
>
> > The DMX/dimmer card is also worth a look since it drives 'random'
> > rather than 'zero crossing' solid state relays. At about GBP2.50
for
> > 2A SSR's it makes an 8 channel dimmer for under GBP100 - compare
that
> > to X10 or C-BUS!
>
> That is quite cheap isnt it ....Whats the advantage of "Random
"...instaed
> of zero crossing..........
>
> I already has CBUS installed for lighting but i like the idea of dmx
relay
> boards ,so would be good if dmx was the chosen xPL rs485 network
> protocol....would consider purchasing some dmx kit if one of the guys
was
up
> for xPLling it.........
>
> > I've also just got two of the NETIOM modules. These are PIC18F452
> > based units with Ethernet and 16 I/O lines and 4 A/D. The
installed
> > application is web based but I've just started work on the
Microchip
> > IP stack to add xPL. More when the design is finalised
>
> Keep us posted on this one ,sounds quite interesting...........
>
> Frank
>
>
>
> ----- Original Message -----
> From: "g8kmh" <lehane@xxxxxxx>
> To: <ukha_xpl@xxxxxxx>
> Sent: Tuesday, November 23, 2004 5:21 AM
> Subject: [ukha_xpl] Re: DMX Controller
>
>
> >
> >
> > Frank,
> > Yes they look interesting, although there are a number of PIC
based
> > designs around at a lower cost which mainly use the parallel port
and
> > a kit from Velleman which is USB based for about EUR80-there seem
to
> > be a few others about too. The better ones don't need repetetive
> > sending of the DMX settings but use bigger PIC's like the 18F452.
> >
> > The DMX/dimmer card is also worth a look since it drives 'random'
> > rather than 'zero crossing' solid state relays. At about GBP2.50
for
> > 2A SSR's it makes an 8 channel dimmer for under GBP100 - compare
that
> > to X10 or C-BUS!
> >
> > There is also an off the shelf 12 channel unit, the DPX12/4 which
is
> > about GBP230. This accepts wires rather than having sockets for
the
> > AC so is ideal for node 0 or node 1 installation. Max load is 43A
> > which should be plenty.
> >
> > I've also just got two of the NETIOM modules. These are PIC18F452
> > based units with Ethernet and 16 I/O lines and 4 A/D. The
installed
> > application is web based but I've just started work on the
Microchip
> > IP stack to add xPL. More when the design is finalised but one of
the
> > design goals is to make it self contained such that it will
respond
> > to its own inputs, as well as xPL control messages. That way the
> > house doesn't go completely dark if the HAPC falls in a heap :-)
> >
> > Lehane
> >
> >
> >
> > --- In ukha_xpl@xxxxxxx, "Frank Mc Alinden"
<fmcalind@b...>
> > wrote:
> > > Hi All
> > >          Have came across a serial dmx controller from UK
based
> > Company
> > > Milford Instruments which looks like it could be easily
> > xPLled .....Looking
> > > at the data sheet it doesnt appear that the serial port has
to
> > constantly
> > > refresh the data ..It also can store up to 60 scenes and
scenes  1
> > to 8 can
> > > be triggered by manual swich inputs.....cost of unit is 65
> > pounds....Also an
> > > 8 way dmx relay board is available.......check it out
> > > http://www.milinst.com/index.htm
> > >
> > >
> > > Frank
> >
> >
> >
> >
> >
> >
> > xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
> http://www.xpl.myby.co.uk
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> >
> >
> >
>
>
>
>
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http://www.xpl.myby.co.uk
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