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The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024

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Re: Caller ID unit.

To: UKHA List <ukha_d@xxxxxxx>
Subject: Re: Caller ID unit.
From: Stuart Grimshaw <stuart@xxxxxxx>
Date: 02 Jul 2003 09:02:38 +0100
Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
References: <bdt21g+atru@xxxxxxx> <008b01c34027$607246b0$0a01a8c0@xxxxxxx>
Reply-to: ukha_d@xxxxxxx

On Wed, 2003-07-02 at 00:20, David Gumbrell wrote:
> Well, you beat me to it then.
>
> The Mitel (MT88E43BS) is the chip with the RS232 almost compatible
output.

Pin 17 of the chip is data out, (5th up from the bottom right) but at
CMOS level rather than TTL.

Jon Payne's circuit
(http://www.photon.dyndns.org/projects/btcd50conversion/index.html)
uses
a MAX232 chip to convert to RS232 (hint, get a free sample of them from
www.maxim-ic.com), the data sheet for which says input is either cmos
compatible.

Can someone confirm that Jon's circuit will work with CMOS level input?

References:
- Caller ID unit.
  - From: "Stuart Grimshaw" <stuart@xxxxxxx>
- Re: Caller ID unit.
  - From: "David Gumbrell" <david@xxxxxxx>

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