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info79
Visitor II
November 23, 2005
Question

comunication with ST7538

  • November 23, 2005
  • 1 reply
  • 613 views
Posted on November 23, 2005 at 07:43

comunication with ST7538

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    1 reply

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    info79Author
    Visitor II
    September 27, 2005
    Posted on September 27, 2005 at 13:20

    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.

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

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

    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.

    3) Have you suggest something ?

    I have best performance with transformer 2:1.

    Thanks to everybody help me....

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