驱动DTR与System.IO.Ports.SerialPort在.NET [英] Driving DTR with System.IO.Ports.SerialPort in .NET

问题描述

我有一个使用RS232通过USB传感器从PC接收命令和数据发送到PC。

I have a sensor that uses RS232 over USB to receive commands from a PC and send data to the PC.

该传感器需要重置（使用DTR行）之前的命令可以被发送给它。

The sensor needs to be reset (using the DTR line) before a command can be sent to it.

我尝试使用内置的.NET串行端口，但它似乎没有驱动DTR行预期。我开始怀疑，如果DTREnable属性实际上驱动DTR针，或者如果它只是使它握手期间。

I tried to use the built-in .net serial port, but it does not seem to drive the DTR line as expected. I am beginning to wonder if the DTREnable property actually drives the DTR pin, or if it only enables it during handshaking.

其他的SerialPort实现，我能找到在网络上也使用Win32 API，但我觉得很困难，关闭端口，这些实现。如果我通过code步骤我可以看到它卡住在WaitOne的命令。

Other SerialPort implementations that I could find on the web also uses the Win32 API, but I find it very difficult to close the port with these implementations. If I step through code I can see it gets stuck on a WaitOne command.

任何人都知道如何驾驶DTR与System.IO.Ports.SerialPort？或者知道一个良好的成分在那里？

Anyone know how to drive DTR with System.IO.Ports.SerialPort? Or know of a good component out there?

推荐答案

我写了这个测试DTR。它的工作原理用我的USB适配器的serialport预期。我通过将电缆连接到我的DataTracker（RS232接口盒，带LED的）签。 DTR确实发生了改变。

i wrote this to test DTR. it works as expected using my USB serialport adapter. i checked it by attaching the cable to my DataTracker (RS232 breakout box, with LED's). DTR does change.

Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
    SerialPort1.Close()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    SerialPort1.PortName = "COM5"
    SerialPort1.Open()
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    SerialPort1.RtsEnable = True

    Debug.WriteLine("DTR +")
    System.Threading.Thread.Sleep(1000)

    SerialPort1.DtrEnable = True 'DTR -
    Debug.WriteLine("DTR -")
    System.Threading.Thread.Sleep(1000)

    SerialPort1.DtrEnable = False 'DTR +
    Debug.WriteLine("DTR +")
    System.Threading.Thread.Sleep(1000)

    SerialPort1.RtsEnable = False
End Sub

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