aldl stuff

[Swayze]

Peter,
Is a 9-volt battery enough to power the circuit?

Swayze
mswayze at truswood.com
kswayze at bellsouth.net
<8-{b>
----- Original Message -----
From: "Peter Gargano" <peter at techedge.com.au>
To: <gmecm at diy-efi.org>
Sent: Tuesday, September 19, 2000 2:59 PM
Subject: Re: aldl stuff


> Mike Swayze wrote:
> >
> > managed to get the max232 ALDL interface soldered up this past weekend,
just
> > need to put it in a box and try it out. I was wondering if one of the
ALDL
> > connector pins is hot as in +12V, ...
>
> Mike, from past discussions, there *are* some US vehicles that
> don't have 12V on the connector. So, most people use the lighter
> socket, or the modem signal driver circuitry diode arrangement.
> Both Andrew M and I have documented this change, and some people
> have found that low power laptops have had problems supplying
> the modem status line power for a MAX232.
>
> >... only thing I had read in the archives was
> > about one of them only being hot when the transmission was in neutral
(or
> > something like that).
>
> That's because someone connected to one of the ECM's outputs
> that was only at 12V sometimes!
>
> BTW. it seems all Australian ALDL connectors do have permanent
> 12V available.
>
> HTH, Peter
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