Re: Caddx/Ademco Downloading

["Mark Leuck" <m..leuck@xxxxxxxxxxx>]

"Nomen Nescio" <nobody@xxxxxxxxx> wrote in message
news:cb458f97c7baff9660540dcc063a3abb@xxxxxxxxxxxx
> Al Mundy said:
>
> >Well, IIRC, any modem that uses the hayes command set can be limited to
> >a max connect speed.
>
> That's not the problem.  The problem is that so-called Hayes-compatible
> modems really aren't.  They communicate okay at standard speeds like 300,
> 1200, and 2400, but the Bell 103 spec calls fror the modem to communicate
> at any desired speed between 0 and 300 baud.  The clone modem
manufacturers
> figured no one would want to run a modem at 75 baud, so they didn't
> implement that feature.
>
> As to why panel manufacturers don't include modem chips, the reason is
> simple:  cost.  If you are selling panels for under $100, every part
> counts, and the fewer components you use, the more money you make.  This
> was particularly true when remotely programmable panels were first
> introduced, and "high speed" modems would have been a massively expensive
> feature to include.  So, the panel manufacturers used the panel's
> microprocessor to do direct serial I/O, which meant their only cost was
> firmware development:  no additional components required.  This
> unfortunately imposes speed limitations, but at the time these panels were
> first introduced, 1200 baud was considered fast.

And alarm manufacturers will not spend the money adding a true modem when
less than 5% of their customers download panels