RE: Powermax PC connection kit.

["Alex Monaghan" <alex@xxxxxxx>]

The MAX232 does all the conversion internally using a few capacitors for
the
voltage doubler & inverter.

If you're only connecting 9,12 to the powermax circuit, I'd suggest that
the
rest is probably as per the MAX232 data sheet - See P17 for sample
connectivity. (http://pdfserv.maxim-ic.com/arpdf/MAX220-MAX249.pdf)

The copyright is probably for the layout on their board :-)

> -----Original Message-----
> From: justin@xxxxxxx [mailto:justin@xxxxxxx]
> Sent: 04 December 2002 20:50
> To: ukha_d
> Subject: [ukha_d] Powermax PC connection kit.
>
>
> I now have a PC connection kit for my Powermax unit.
>
> The board which fits inside the Powermax consists of just 7
components. A
> MAX232 chip and (drawing on my extensive knowledge of MAX232
> circuits :-)) what
> I think are 6 capacitors. Being so small the circuit looks more
> complicated
> than it is - I might have a job working out how it all connects
together!
>
> Supposing I can work it out, the board clearly has a copyright
> mark on it.
> Where do I stand on posting details of the circuit?
>
> I had hopes of 'snooping'(?) the serial protocol and writing a
> HomeSeer plugin
> to communicate with the unit. Sadly the Powermax needs to be in
> installer mode
> to do PC comms :-(
>
> Someone asked where I purchased the 'kit' from when I mentioned it in
a
> previous post. It came from Gardiner Security. The local branch
> is only 5 mins
> from my house so I popped in to have a look at one and got carried
away!
>
> Gardiner have consistently been cheaper than other suppliers so I
> have asked
> for a price on the new remote keypad. I don't want one ATM but
> thought others
> on the list might be interested. I'll report back.
>
>
> Justin.
>
>
> http://www.automatedhome.co.uk
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