C# SerialPort DSR/DTR和CTS/RTS握手

Question

我正在尝试使用C#/.NET的SerialPort类与设备通信。

这里描述了与设备交互的文档。

​

​

我正在使用一个与TX/RX和所有握手引脚交换(验证)的零调制解调器电缆。

我希望下面的C#代码能够工作，但我不会从我试图与之交互的相机中得到任何响应(低到高)。不过，我相信问题在于代码。这台相机与其他“个人电脑”一起工作。为什么我永远不会在我的代码中获得DsrHolding (空调制解调器电缆，所以从相机高DTR )成为真？

static void Main(string[] args)
{
    var serialPort = new SerialPort("COM5");

    // start the DSR/DTR handshake
    // we are using a null modem cable, so DTR/DSR is switched
    serialPort.DtrEnable = true;
    while (!serialPort.DsrHolding)
    {
        // probally should timeout instead of infinite wait
        Thread.Sleep(10);
        Console.WriteLine("Waiting for the DTR line to go high.");
    }


    // start the RTS/CTS handshake
    // we are using a null modem cable, so RTS/CTS is switched
    serialPort.RtsEnable = true;
    while (!serialPort.CtsHolding)
    {
        // probally should timeout instead of infinite wait
        Thread.Sleep(10);
        Console.WriteLine("Waiting for the RTS line to go high.");
    }

    // read/write
    //serialPort.Write("Some command");
    //var response = serialPort.ReadChar();
    //while (response != stopBit)
    //    response = serialPort.ReadChar();

    // close the connection because we have written/read our data

    // start the DSR/DTR handshake
    // we are using a null modem cable, so DTR/DSR is switched
    serialPort.DtrEnable = false;
    while (serialPort.DsrHolding)
    {
        // probally should timeout instead of infinite wait
        Thread.Sleep(10);
        Console.WriteLine("Waiting for the DTR line to go low.");
    }


    // start the RTS/CTS handshake
    // we are using a null modem cable, so RTS/CTS is switched
    serialPort.RtsEnable = false;
    while (serialPort.CtsHolding)
    {
        // probally should timeout instead of infinite wait
        Thread.Sleep(10);
        Console.WriteLine("Waiting for the RTS line to go low.");
    }
}

Answer 1

你试过用直通电缆吗？相机可能已经处理了需要交叉的引脚。

Answer 2

代码中缺少serialPort.Open();。