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thorsten-kopp
Visitor II
September 23, 2005
Question

programming the control register (st7538)

  • September 23, 2005
  • 37 replies
  • 5866 views
Posted on September 23, 2005 at 06:01

programming the control register (st7538)

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    37 replies

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    R
    reinhard_larch
    Visitor II
    May 4, 2005
    Posted on May 04, 2005 at 16:30

    Hi flo123,

    here is my e-mail address:

    reinhard_larch@yahoo.com.au

    thanks a lot, very much appriciated!!!

    Regards

    reny

    B
    boicuflorin
    Visitor II
    May 12, 2005
    Posted on May 12, 2005 at 06:55

    Hi Reny,

    I send you an email !

    By

    Y
    yuanye-28
    Visitor II
    June 9, 2005
    Posted on June 10, 2005 at 01:42

    hi,flo123

    Could you send me?

    my emial is

    mailto:yuanye-28@163.com

    thank you very much.

    B
    boicuflorin
    Visitor II
    September 20, 2005
    Posted on September 20, 2005 at 10:55

    Hi,

    I want to implement an FEC (forward error correction) in my ST7538 modem. What algorithm you had use ??? can you give me a suggestion :)

    Thank's

    K
    krapf
    Visitor II
    September 21, 2005
    Posted on September 21, 2005 at 11:13

    Error Correction?

    Well, I am using the old Hamming code.

    The amount of hamming bits to be used is up to you to decide...

    But there is a class of FEC codes called TURBO CODES that are much more efficient, but they need a lot of processing power.

    Rafael Krapf

    BRASIL

    I
    info79
    Visitor II
    September 23, 2005
    Posted on September 23, 2005 at 05:50

    Hi everybody,

    I'm working with ST7538. I'm transmit between neutral fase and ground line to avoid problem in trifase system with 132,5 Khz frequency and 2400 baud. In some site I have problem of noise and the CD/PD line toggle. This problem occure some hours a day. By your esperience should I change some parameters as frequency or baud rate to improve the comunication ?

    I'm use a preamble byte every transmission to syncronize the comunication but during noise doesn't work correct.

    Have you suggest me a way to avoid noise by software ?

    What is the best configuration of register to avoid noise and have best performance ?

    Thanks to everybody help me....

    I
    info79
    Visitor II
    September 23, 2005
    Posted on September 23, 2005 at 06:01

    Hi Everybody,

    another problem I have is a noise on clock CLR/T. In some device it's a stable but in other the clock swing. The hardware and components are the same. If I disconnect the transformer from line the clock became stable. Have you suggest something ?

    I have best performance with transformer 2:1.

    Thanks for help.

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