Can I send AT commands through hyper terminal, or is another window required? While using UART 2, do we need to have all the four signals or only TXD and RXD will do?

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    MicrosoftInternetExplorer4

    You can always use the HyperTerminal to send
    AT commands.

    If you have HW flow control then its best and
    all 4 lines should be connected.

     

    If you don’t have HW flow control then the TX
    and RX and GND will be enough but the RTS should be pulled down to the ground.