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Am I stupid ?

Discussion in 'Hobby Electronics' started by Miro, May 31, 2006.

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  1. Miro

    Miro Guest

    What ? I want to make a board that converts RS422 into RS232

    I have 7.5V regulated power and several hardware handshaking lines which are
    more or less unchanged but can be taken down to TTL for opto isolation.

    I also have about 12 schematics from www.rs485.com which are good enough to
    use as a starting point.

    I need a special connector on the RS422 side (AB05) and a heavy duty DB9 on
    the serial end. I have all pinouts.

    Is there some reason why no person can just tell me that they know what I
    want to build but insist on specifications for the most well know comms bus
    in the world ? We are talking about 1980's technology.

    Anyone in Sydney want this project ? Design and artwork ?

    What am I missing here ?

    ===============================
    RS422 + handshaking from 232 + power

    TTL

    OPTO ISOLATION

    TTL

    RS232
    ================================

    There are at least a dozen chips for each process. There are also SMD and TH
    versions of everything.

    Anyone interested ? Reply in thread please !
     
  2. Mark Harriss

    Mark Harriss Guest

    http://www.integrityusa.com/converteritemw.asp?record=35

    $65 US and some connector rewiring.
     
  3. Miro

    Miro Guest

    Where do I connect the RS-232 hardware handshaking lines on the RS422 side ?
    Unless you are suggesting a "rats nest" internal wiring. I was hoping for a
    custom board.

    Any takers ?
     
  4. Mark Harriss

    Mark Harriss Guest

    No, I'm suggesting you grow a brain
     
  5. Outback Jack

    Outback Jack Guest

  6. Mr.T

    Mr.T Guest

    Yes there is, the current model Aston Martin is the DB9. :)

    MrT.
     
  7. Miro

    Miro Guest


    Whether there is or there isn't I am quite certain I could order as many as
    I like calling it as I did.
     
  8. Miro wrote:

    You have not had a real helpful reply yet. RS232 has signals that go
    FROM one device TO another. RS422 can do the same but is often
    implemented as a signal BETWEEN devices (really doing it as RS485)

    To understand your problem you would need to provide some more info,
    however given that you are not sure where handshaking goes, I'm guessing
    that you hav one pair of 422 wires your trying to cram Tx, Rx, rts
    etc... down. That may not work for you.

    In some cases you can just loop back handshaking and have 422 tx and 422
    rx. If rx and tx are on same 422 pair then you probably need some sort
    of protocol conversion.

    Not stupid, just need to establish problem clearer.


    cya, Andrew...
     
  9. Miro

    Miro Guest

    So I take it that no person on here actually makes boards otherwise someone
    would have taken the offer by now.
     
  10. I'll do it, but its going to cost you $170/hour.
     
  11. I work cheap, I'll do it for $169/hour.

    Dave :)
     
  12. Most people here wouldn't be in that small job contract business, and
    would charge more than you think.
    However, there are guys around that advertise and do this sort of
    stuff. Look at the back of Silicon Chip mag, there are a couple that
    sound as though they will do it, like this one:
    http://www.sesame.com.au/

    Dave :)
     
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