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Serial Transmitters

Discussion in 'Electronic Basics' started by ludnough, Jan 17, 2004.

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  1. ludnough

    ludnough Guest


    A simple question. Are RSxxx transmitters and UARTS synonymous or are
    they separate modules? If they're separate, what's the difference?

  2. hamilton

    hamilton Guest

    You are getting your term confused.
    Are RSxxx transmitters and UARTS synonymous or are

    I think you mean RS-232 or RS-485 here. There are just voltage levels.
    These voltage levels have nothing to do with the serial data stream,
    so the serial stream can come from a bit banged micro, or a UART, or an

    A UART is a hardware module inside a chip, or a standalone single chip
    UART ( old technology).

    The advent of the PC and people using the terms interchangeably has caused
    all this confusion.
  3. ludnough

    ludnough Guest

    I was more concerned with the "transmitter" part of the term. I should
    have clarified. On any note, I have seen the term "RS232 Transmitter"
    used, but only once as a synonym for UART, and I have no other sources to
    confirm if they are one and the same or not. Forgive me if I sound
    boneheaded. I was wondering if the "RS232 Transmitter" and the the
    transmitter portion of a UART are the same.
  4. They (if I read your question correctly) are very different devices.

    A UART (Universal Asynchronous Receiver/Transmitter) does the
    serial<->parallel conversion, and adds start and stop bits to the
    transmitted data. The signal levels on the serial side are normally
    TTL (0 and 5 volts).

    An RS-232 line driver/receiver (such as a MAX232, MC1488/1489) is a
    level shifter and inverter, to convert the TTL levels from the UART to
    RS-232 levels (typically +/-12 volts or so), and convert from RS-232
    to TTL levels.

    Peter Bennett, VE7CEI
    peterbb (at)
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  5. hamilton

    hamilton Guest

    For all intent and purpose, YES they are the same.

    But this is an electronics group. So they are not the same.
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