可以发送/无法读取 .NET 串口

Can send/Can#39;t read .NET serial port(可以发送/无法读取 .NET 串口)

问题描述

可能重复:
C#串口和超级终端

问题

我的串行连接有问题.我可以将数据发送到我的设备，但我无法读取数据.如果我使用 Hyperterm，一切正常 - 我可以看到数据进出.

Problem

I'm having trouble with my serial connection. I can send data to my device, but I can't read data. If I use Hyperterm, everyting work fine - I see the data coming in and going out.

但是，使用我的代码，我的串行端口对象从不接收任何数据，但我发送的数据被设备接收.

Using my code, however, my serial port object never receives any data, but data I send is received by the device.

有什么想法吗?

• WPF
• .NET 3.5(不是客户端配置文件版本)
• 在 Windows 7 上开发
• Visual Studio 2010
• DA-15 串口转 USB

• COM20
• 每秒位数:115200
• 数据位:8
• 奇偶校验:无
• 停止位:1
• 流控制:无

SerialPort serial = new SerialPort();

serial.PortName = "COM20";
serial.BaudRate = 115200;
serial.DataBits = 8;
serial.Parity = Parity.None;
serial.StopBits = StopBits.One;
serial.Handshake = Handshake.None;

serial.Open();
serial.Write("Hello World
");    // Echoed on device screen

while (0 == serial.BytesToRead)     // Never receive a response
    System.Threading.Thread.Sleep(100);

char[] first = new char[serial.BytesToRead];
serial.Read(first, 0, first.Length);

我在上面提到过，但为了确保每个人都知道，我使用的是 USB 转串行端口电缆.我认为这不是问题，因为它适用于 Hyperterm，但以防万一.

I noted it above, but just to make sure everyone knows, I am using a USB to Serial Port cable. I don't think this is the issue because it works on Hyperterm, but just in case.

推荐答案

看看 MSDN 示例 他们使用单独的线程来检查数据.您还可以订阅 DataReceived 事件 看看它是否在发射.还有一个关于设置 DTR 和 RTS 为真，如果连接的设备需要它们，它将不会传输数据.

Take a look at the MSDN Example they are using a seperate thread to check for Data. You can also subscribe to the DataReceived Event to see if it is firing at all. And there is a Community comment about setting DTR and RTS to true, if the connected device needs them it will not transmit data.

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