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luigi2
Visitor II
May 10, 2005
Question

Rs485 & uPSD3334D

  • May 10, 2005
  • 2 replies
  • 662 views
Posted on May 10, 2005 at 17:32

Rs485 & uPSD3334D

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    2 replies

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    luigi2Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:06

    I must connect three units with protocol master\slave

    have any example code function, for the serial comunication in 8051 whit the rs485 protocol?

    I would create a netwarok with 1 master and more slave, the slave measuring 4 o 5 parameters (Example:voltage,temperature, exc) and send at the master this data only when it comes to it asked, but if are an allarm (example temperature > 30 °C) it send only the name of alarm sensor.. the data line is an rs485

    I use uPSD3334D

    R
    rk1
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:06

    hi,

    rs485 is not a protocol, but a ''physical layer''.

    you should handle the rs485 like a ''normal'' uart (rs232) from the 8051.

    (see UART-section in the datasheet.)

    the rs232-rs485-conversion has to take place outside of the uPSD33xx.

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