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Modems... — Parallax Forums

Modems...

ArchiverArchiver Posts: 46,084
edited 2002-10-10 01:22 in General Discussion
Does anybody know any good sites with some basic modem theory. I hava stamp
sending data thru a modem, but am having trouble receiving (its not a speed
issue). I think the modems at each end are incompatible due to settings
internally that I can change, but dont know how to.

Thanks in advance...
Chris

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-10-09 18:06
    This may be a long shot, but I would try the www.tldp.org. (The Linux
    Documentation Project). Its mostly about Linux, but a lot of other good
    info seems to find its way there as well.

    Blake


    On Wed, 2002-10-09 at 04:55, Chris Anderson wrote:
    > Does anybody know any good sites with some basic modem theory. I hava stamp
    > sending data thru a modem, but am having trouble receiving (its not a speed
    > issue). I think the modems at each end are incompatible due to settings
    > internally that I can change, but dont know how to.
    >
    > Thanks in advance...
    > Chris
    >
    >
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  • ArchiverArchiver Posts: 46,084
    edited 2002-10-09 19:28
    Jan Axelson's site < http://www.lvr.com > has great information, as does
    her book "Serial Port Complete."
    Dennis
    Original Message
    From: Chris Anderson [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iKgx_gKiwUaliqfaqpk9ofvWjWD0oUu4bu-DpWUxxfTq-_CFbvYPxYKc0913Q3ATuaZ-BZD2fubwy2vqrQ]fuel@b...[/url
    Sent: Wednesday, October 09, 2002 4:56 AM
    To: Stamp Group
    Subject: [noparse][[/noparse]basicstamps] Modems...


    Does anybody know any good sites with some basic modem theory. I hava
    stamp sending data thru a modem, but am having trouble receiving (its
    not a speed issue). I think the modems at each end are incompatible due
    to settings internally that I can change, but dont know how to.

    Thanks in advance...
    Chris


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject
    and Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2002-10-10 01:22
    >Does anybody know any good sites with some basic modem theory. I hava stamp
    >sending data thru a modem, but am having trouble receiving (its not a speed
    >issue). I think the modems at each end are incompatible due to settings
    >internally that I can change, but dont know how to.
    >
    >Thanks in advance...
    >Chris

    There is some information on my site:

    http://www.emesys.com/BS2rs232.htm#modem

    Also, here is a nice article by Scott Edwards from Nuts & Volts:

    ftp://nutsvolts.com/stampaps/st_ap24.pdf

    Also look in the Cermetek literature, app. notes, especially the one
    on the AT commands and S registers:

    http://www.cermetek.com/04/app.html

    It always helps immensely to have the technical manual for the modem
    you are using, because there is a lot of variation among modem models
    in which commands and registers are implemented in order to support
    their features.

    Quite often a simple old modem will have trouble talking to a modern
    advanced modem, unless you turn off advanced MNP and fax features
    like compression and correction. The AT command for that is usually
    AT \N0 %C0 ^M
    The articles above have a lot of detail and special considerations
    for the Stamp. What do you mean when you say "trouble receiving"
    (its not a speed issue)?

    -- Tracy
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