Re: 12v down Cat5 again

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

Hi David

I recall mention of 300mA .....and as Tracey mentioned  330mA ... so must
be
close enough....

I  send 12v from my probe system to each zone box but i use 100mA
resettable
fuses which goes high resistance @ around 150mA ....You can get different
ratings of course.....nice thing is if one cable goes short it doesnt bring
the whole system down ...just that cable run....

HTH
Frank


----- Original Message -----
From: "David Chapman" <david@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, January 10, 2006 3:11 AM
Subject: [ukha_d] 12v down Cat5 again


> Yes I know it's been discussed before but I can't find any consensus
on
> the
> figures.
>
> Although it has batteries my WM968 weatherstation needs 12v - mainly
to
> power the backlight behind the LCD display which comes on when you
touch
> it.
>
> Got the meter out and it's 12v and needs 10mA most of the time
increasing
> to
> 150mA for the 10 seconds or so when backlight is on. Although it's
Cat5
> I'm
> sending good old RS232 down it to the Com port of the PC - I think
just
> pins
> 2, 3 and 7 so should have potential to double up the available pairs
to
> supply 12v if necessary, distance is about 10 metres.
>
> Be great to feed the 12v from node zero and avoid the black box. I
would
> of
> course put a fuse in to protect the cable but is an occasional 150mA
> asking
> too much ?
>
> David C
>
> ps I was talking about RS232 during Christmas after the Spitting Image
> tribute with some friends who don't go back further than USB. Anyone
else
> remember the Spitting Image tribute song to the "RS232, RS232, RS
two
> thirty
> two interface lead" ?
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>