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Re: Re: How do I tell whether the phone's ringing?
----- Original Message -----
From: "PatrickLidstone" <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, December 05, 2001 4:52 PM
Subject: [ukha_d] Re: How do I tell whether the phone's ringing?
> --- In ukha_d@y..., "Luc Degrande" <luc.degrande@s...>
wrote:
> > There will be some components required: an external modem has a
> > dedicated pin as "Ring Indicater". The level swings
from
> > -12VDC to +12VDC, I suppose this will need conversion to TTL
level
> > for connection to the input.
>
> A diode should be enough for HV, it's inputs are buffered aren't
> they, rather than TTL?
>
> Patrick
>
Could be that it is enough, I don't know how the inputs are made on HV.
RS232 signals can push or pull up to 20mA so a good investigation
might be required....
Better be safe than sorry.
Luc.
For more information: http://www.automatedhome.co.uk
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