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PICList Thread
'Modem'
1997\05\26@210032 by araneo

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Is there any aplication note for making an external modem. I'm shure
that it's not that complex.

1997\05\27@111322 by Gerhard Fiedler

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At 21:51 26/05/97 -0300, Andres Araneo wrote:
>Is there any aplication note for making an external modem. I'm shure
>that it's not that complex.

Have a look at the Rockwell chips, this is probably the easiest way to make
a modem. (There are a couple of other companies which have some modem chips
in their lists -- mostly 1200bps stuff --, but I don't remember any of them.)


-------------------------------------
Gerhard Fiedler <spam_OUTgerhardTakeThisOuTspampobox.com>
S‹o Paulo - Brazil

1997\05\27@203706 by Bryan Hord

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Modems:  Rockwell and MX-COM,

We are using the Rockwell RC224ATL for an embedded 1200 baud FSK modem.  It
allows for a serial or parallel interface and operation to 2400 baud.  If
you are connecting it to a telephone system, it has the capability of
driving a DAA (Data Access Arrangement - that's the transformer, filter and
amplifier to connect to the telephone line) directly.  We are using it for a
wireless application.  It supports the AT command set and also comes in a
FAX/modem part RC224ATF.  It is very easy to use.  In small quantities they
are about $10 from Marshall.  Does anyone know if this is the same part that
came out in PC modems years ago?

Another source is MX-COM.  They only seem to have serial interface parts so
you need a UART as they require proper timing of the serial data.  Actually
you don't need a UART since they have taken pains to make it tolerant of
sloppy bit timings but the data rate needs to be accurate.  The MX-COM parts
are cheaper than the Rockwell parts.  They have a web site with .pdf data
sheets.

Cermetek makes a complete modem module but it's really expensive.  It is
probably the easiest solution if you want a telephone modem.

What other sources of single chip modems have you found?

Is this what you wanted or are you trying to actually build your own modem?

At 09:51 PM 5/26/97 -0300, you wrote:
>Is there any aplication note for making an external modem. I'm shure
>that it's not that complex.
>
>

1997\05\27@212422 by araneo

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Bryan Hord wrote:
{Quote hidden}

I want to make a home built modem for my PalmPilot (PDA from
USRobotics). The main reason is that the product specific modem costs
200 buck where i live. And although I CAN use any external modem. They
tend to be quite big in size. So i jus want to build a small modem (not
worrying about speed, because it's just to send e-mail).

1997\05\28@063711 by Didier JEANJEAN

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Can you give us the adress of the web site of MX-COM.

Thanks
Didier


----------
> From: Bryan Hord <.....bryanKILLspamspam@spam@WLLINK.COM>
> To: PICLISTspamKILLspamMITVMA.MIT.EDU
> Subject: Re: Modem
> Date: mercredi 28 mai 1997 2:34
>
> Modems:  Rockwell and MX-COM,
>
> We are using the Rockwell RC224ATL for an embedded 1200 baud FSK modem.
It
> allows for a serial or parallel interface and operation to 2400 baud.  If
> you are connecting it to a telephone system, it has the capability of
> driving a DAA (Data Access Arrangement - that's the transformer, filter
and
> amplifier to connect to the telephone line) directly.  We are using it
for a
> wireless application.  It supports the AT command set and also comes in a
> FAX/modem part RC224ATF.  It is very easy to use.  In small quantities
they
> are about $10 from Marshall.  Does anyone know if this is the same part
that
> came out in PC modems years ago?
>
> Another source is MX-COM.  They only seem to have serial interface parts
so
> you need a UART as they require proper timing of the serial data.
Actually
> you don't need a UART since they have taken pains to make it tolerant of
> sloppy bit timings but the data rate needs to be accurate.  The MX-COM
parts
> are cheaper than the Rockwell parts.  They have a web site with .pdf data
> sheets.
>
> Cermetek makes a complete modem module but it's really expensive.  It is
> probably the easiest solution if you want a telephone modem.
>
> What other sources of single chip modems have you found?
>
> Is this what you wanted or are you trying to actually build your own
modem?
>
> At 09:51 PM 5/26/97 -0300, you wrote:
> >Is there any aplication note for making an external modem. I'm shure
> >that it's not that complex.
> >
> >

1997\05\28@073351 by Thomas Vegeby

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>Can you give us the adress of the web site of MX-COM.

http://www.mxcom.com

Thomas Vegeby

1997\05\28@133154 by Bruce Cannon

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By all means look at the cermatek or xecom modem modules; $50 qty 1, and
you're done.  They have DAA, modem, everything in there, and all you need
to do is talk to them as if they were any serial device.  They're great.

----------
Bruce Cannon
Style Management Systems

Remember: electronics is changing your world...for good!

----------
> I want to make a home built modem for my PalmPilot (PDA from
> USRobotics). The main reason is that the product specific modem costs
> 200 buck where i live. And although I CAN use any external modem. They
> tend to be quite big in size. So i jus want to build a small modem (not
> worrying about speed, because it's just to send e-mail).
>


'modem'
1998\06\20@193615 by CEFERINO ARAOZ FERRER
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face
Hi:

I made an automation with a pc and i want to control it via modem.
Somebody knows where i could find examples with Visual Basic. Thanks

Oscar Araoz
email: .....twisterKILLspamspam.....bbs.frc.utn.edu.ar

1998\06\22@024045 by WF AUTOMACAO

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OSCAR CEFERINO ARAOZ FERRER wrote:
>
> Hi:
>
> I made an automation with a pc and i want to control it via modem.
> Somebody knows where i could find examples with Visual Basic. Thanks
>
> Oscar Araoz
> email: EraseMEtwisterspam_OUTspamTakeThisOuTbbs.frc.utn.edu.ar

Try http://www.marshallsoft.com or http://www.microway.com

Miguel.

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