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USB to UART Adapter, what is what?

  • I find several USB to UART Adapter in the internet for example a:
    4Pin Adapter
    5Pin Adapter (onion.io store)
    6Pin Adapter

    The labels of the 6Pins are:

    Voltage Jumper 3.3/5V

    As i guess for the Omega i will need TXD/RXD and 3.3V?

    What are the other pins for? For what could they be useful?

  • @Luciano-S. Difficult to make out all details from the links you supply however, as far asI can see:

    1. All the adapters you reference have:

      • VCCIO - power to the adapter 3.3v or 5v
      • GND - common ground
      • TXD - transmit data
      • RXD - receive data

      This probably covers the minimum that one would need

    2. The 5 pin adapter adds an RST - I'm assuming this is some form of reset- but without more technical details of the adapter it is not clear

    3. The 6 pin adapter has RTS and CTS.
      On some forms of serial communication these are used for flow control - one end asserts RTS (Request To Send) and when it is OK for the data to be sent the other end asserts CTS (Clear To Send). These and other aspects of Serial communication using R2-232 are covered in https://en.wikipedia.org/wiki/RS-232 but I don't think you need to worry too much about all this.

    My guess is that a 4 pin adapter would be all you need

  • administrators

    Yep, @Kit-Bishop is correct, for the Omega you only need:

    • VCC - power
    • Ground
    • TXD - transmit data
    • RXD - receive data

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