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Wireless RS232

Discussion in 'Electronic Basics' started by Bart, Sep 18, 2006.

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  1. Bart

    Bart Guest

    I'd like to accomplish wireless RS232 between two computers running
    hyperterminal or procom without any additional software/programming, using
    the standard com ports (DB9).
    Once again I'm Googled out. At first I thought I could splice into a pair
    of FRS two-way radios, still thinking about it but some sites said those
    frequencies are for voice only and I'd be violating FCC rules. Still, seems
    I should be able to turn my RS232 pulses into something broadcastable over
    these radios and then decipher the received tones at the othere end into
    RS232 pulses, waalaa!
    Another thought is to build from off the shelf components such as something
    like:
    Computer #1's com port
    1."Serial to USB" adapter >>> $19.00
    2."USB to Ethernet" adapter >>> $27.00
    3. Ethernet Wireless Access point or adapter >>> $40.00

    Then Computer #2 has the same. There's probably some protocol I'd have to
    put at the beginning of my ASCII file transfer to address the receiving
    wireless adaptor to know its being addressed, yes?
    Am I wasting my energy? Can I direct my energy in another direction to
    accomplish my goal of sending ASCII files wirelessly? My goal is to
    eventually send ASCII files wirelessly to "dummy terminals" (CNC machines)
    that you simply set its RS232 to receive and it will swallow anything ASCII
    coming in its DB9 com port socket.
    Any thoughts/ideas/opinions greatly appreciated
    Thanks in advance,
    Bart
     
  2. Which OS? If you are running XP why not a wireless network? If they are
    industrial, some sort of RS-485?
     
  3. Bart

    Bart Guest

    Thanks for replying Homer,
    Wireless RS-485? I've seen RS232 to RS485 converters but not sure how
    this comes into play with my dilemma. The "dummy" terminals are of
    a PLC nature, only configurable to the extent of Baud, Data, Stop bits
    and thats it.....no way to add software or switch operating systems. They
    will Send ASCII files and they will Receive ASCII files and I'm hoping
    to do this wirelessly....somehow, from my laptop.
    Bart
     
  4. http://www.google.com/Top/Business/..._Acquisition_and_Control/Data_Communications/

    http://www.omega.com/

    http://www.moxa.com/

    might be a start.
     
  5. Plenty of off-the-shelf wireless RS232 solutions are available, some
    work a lot better than others depending upon your application. Most of
    them are completely transparent, no need to set them up at all in many
    cases, and no drivers or anything else required. They literally are a
    "wireless RS232 cable".

    This brand is the ducks guts, have worked for me on short packet
    streams when other brands have not:
    http://www.maxstream.net/products/xstream/rf-modem-rs232.php

    I can't believe you didn't find anything on Google, "wireless rs232"
    gets plenty of options.

    Blue tooth ones like this are very popular if range is short:
    http://www.ipenabled.com/bluetooth-rs232.html

    I've had some brands fail because some of them will only send a
    "packat" once it has received enough bytes to fill it, so if you only
    send a byte or two it just sits there stupid until it gets enough data
    to send.

    Dave :)
     
  6. Si Ballenger

    Si Ballenger Guest

    You may want to check some of the RF modules from the below
    makers.

    http://www.radiotronix.com/
    http://www.lemosint.com/
    http://www.linxtechnologies.com/
    http://www.abacomdirect.com/
    http://www.maxstream.net
     
  7. Ben Wheare

    Ben Wheare Guest

    I would recommend the LPRS EasyRadio modules, just connect them to 5V,
    and a MAX232 if needed, and you have wireless RS232.
    They are made in the UK, but
    http://www.saelig.com/miva/merchant.mvc?Screen=CTGY&Category_Code=RW
    distribute them in the US.

    They either transmit after 180bytes, or when a 2byte gap is detected.
    Simply use serial in/out.
     
  8. Bart

    Bart Guest

    I'd like to accomplish wireless RS232 between two computers running
    <snip>
    <snip>

    Thanks for the replies! The links I clicked on from a Google search seemed
    units were all over $200 a piece, some $400 and $600....but as I took the
    time to surf the links you supplied I find some around $100 and modules as
    low as $20...........COOL! Seems I need more patience with Google and should
    take time to surf a sight that it suggests instead of just the page it takes
    me to.
    I was impressed with Maxstream's site, gonna call them today.
    Thanks again,
    Bart
     
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