如何使USB串口通信适应RS232到USB串口通信。 [英] How to adapt USB serial communication to RS232 to USB serial port communication.
本文介绍了如何使USB串口通信适应RS232到USB串口通信。的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个使用C＃windows论坛设计的GUI，他们使用USB串行通信进行通信，以便与硬件电子设备进行通信。
我想使用与其他硬件电子设备相同的GUI，但我使用RS232转USB转换器将数据从电子设备发送到PC。是否可以将RS232到USB转换器检测为USB设备并使用相同的GUI？当我尝试使用VID或PID时，他们正在尝试进行USB通信，但它无法正常工作。我需要任何驱动程序吗？
我非常想通过c＃中的serialport类建立串行通信。我能够接收和发送数据到电子产品。问题是设计整个GUI会花费我很多时间。如果我能够使用相同的GUI那么它会非常好。
我已经附上了简单的代码，他们正在寻找USB。任何建议我如何使用相同的代码？
I had a GUI designed using C# windows forums, they are communicating using USB serial communication to communicate with Hardware electronics.
I want use the same GUI with some other hardware electronics but i am using RS232 to USB converter to send data from electronics to PC. is it possible to detect RS232 to USB converter as USB device and use the same GUI? when i tried with VID or PID which they are trying for USB communication its not working. do i need any drivers?
I tried susscefully to establish serial communcation via serialport class in c#. I was able to receive and send data to electronics. The thing is to design the entire GUI will take alot of time for me. If i am able to use same GUI then it would really nice.
I have attched simple code how they are looking for USB. any suggestions how can i use same code?
// in the main form.....
private void USB_USBConnected(object sender, ConnectedEventArgs e)
{
if (USB.Connected)
{
Serial.SerialConnected += new EventHandler<ConnectedEventArgs>(Tpvt_SerialConnected);
Tpvt = new Serial(USB.ComPort, USB.MaxBaudRate);
if (Tpvt.Connected)
{
ThreadSafeToolStripSetText(ConnectToolStripStatusLabel, Tpvt.ConnectionStatus);
}
}
else
{
Tpvt.Disconnect();
}
}
in usb class.....
namespace SMart_2
{
public static class USB
{
#region PROPPERTIES
//Connected to SMART
private static bool _connected = false;
public static bool Connected { get { return _connected; } }
//Com port name
private static string _comPort;
public static string ComPort { get { return _comPort; } }
//Should be SMART
private static string _name;
public static string Name { get { return _name; } }
//SMART id number ranging from 1001
private static int _id;
public static int Id { get { return _id; } }
//SMART max baud rate number ranging from 1001
private static int _maxBaudRate;
public static int MaxBaudRate { get { return _maxBaudRate; } }
private static ManagementEventWatcher _w;
public static event EventHandler<ConnectedEventArgs> USBConnected;
public static event EventHandler<MessageEventArgs> USBException;
#endregion
#region PRIVATE METHODS
//Send event to MainForm that SMART is connected
private static void NotifyUSBConnected()
{
if (USBConnected != null)
{
object obj = new object();
ConnectedEventArgs e = new ConnectedEventArgs(_connected);
USBConnected(obj, e);
}
}
//Send event to MainForm about exception
private static void NotifyUSBException(string text)
{
if (USBException != null)
{
object obj = new object();
MessageEventArgs e = new MessageEventArgs(text);
USBException(obj, e);
}
}
//Analyse USB string, find Vendor ID, Product ID and TurboPVT ID
private static void AnalyseUSBString(string usbString, out string vid, out string pid, out string id)
{
int vidStart;
int pidStart;
int idStart;
int idLength;
usbString = usbString.Replace("\"","");
vidStart = usbString.IndexOf("VID_") + 4;
vid = usbString.Substring(vidStart, 4);
pidStart = usbString.IndexOf("PID_") + 4;
pid = usbString.Substring(pidStart, 4);
idStart = usbString.IndexOf("ID:") + 3;
idLength = usbString.Length - idStart;
id = usbString.Substring(idStart, idLength);
}
#endregion
#region PUBLIC METHODS
// Use Wmi to search for SMART
public static void Search()
{
string usbString;
string comPort;
string name;
string maxBaudRate;
string vid;
string pid;
string id;
ManagementObjectSearcher searcher = null;
try
{
searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_SerialPort");
foreach (ManagementObject queryObj in searcher.Get())
{
if (!_connected)
{
usbString = queryObj["PNPDeviceID"].ToString();
AnalyseUSBString(usbString, out vid, out pid, out id);
if (vid == "03EB" && pid == "2018")
{
comPort = queryObj["DeviceID"].ToString().ToUpper();
name = queryObj["Description"].ToString();
maxBaudRate = queryObj["MaxBaudRate"].ToString();
if (name == "Smart")
{
_comPort = comPort;
_name = name;
_id = int.Parse(id);
_maxBaudRate = int.Parse(maxBaudRate);
_connected = true;
NotifyUSBConnected();
}
}
}
}
}
catch (Exception ex)
{
NotifyUSBException(string.Format("Error while querying for WMI data: {0}", ex.Message));
return;
}
finally
{
if (searcher != null)
{
searcher.Dispose();
}
}
}
#endregion
#region ADD EVENT HANDLERS
//Adds eventhandler for insertion of new USB device
public static void AddInsertUSBHandler()
{
WqlEventQuery q;
//ManagementEventWatcher w;
ManagementScope scope = new ManagementScope("root\\CIMV2");
scope.Options.EnablePrivileges = true;
try
{
q = new WqlEventQuery();
q.EventClassName = "__InstanceCreationEvent";
q.WithinInterval = new TimeSpan(0, 0, 3);
q.Condition = "TargetInstance ISA 'Win32_USBControllerdevice'";
_w = new ManagementEventWatcher(scope, q);
_w.EventArrived += OnUSBInserted;
_w.Start();
}
catch (Exception ex)
{
NotifyUSBException(string.Format("Error while adding insert USB event handler: {0}", ex.Message));
if (_w != null)
{
_w.Stop();
}
}
}
//Adds eventhandler for removal of USB device
public static void AddRemoveUSBHandler()
{
WqlEventQuery q;
ManagementScope scope = new ManagementScope("root\\CIMV2");
scope.Options.EnablePrivileges = true;
try
{
q = new WqlEventQuery();
q.EventClassName = "__InstanceDeletionEvent";
q.WithinInterval = new TimeSpan(0, 0, 3);
q.Condition = "TargetInstance ISA 'Win32_USBControllerdevice'";
_w = new ManagementEventWatcher(scope, q);
_w.EventArrived += OnUSBRemoved;
_w.Start();
}
catch (Exception ex)
{
NotifyUSBException(string.Format("Exception in adding remove USB handler: {0}", ex.Message));
if (_w != null)
{
_w.Stop();
}
}
}
#endregion
#region EVENTS
//Event for USB inserted
private static void OnUSBInserted(object sender, EventArrivedEventArgs e)
{
try
{
Search();
}
catch (Exception ex)
{
NotifyUSBException(string.Format("Exception in USBInserted event: {0}", ex.Message));
}
}
//Event for USB removal
private static void OnUSBRemoved(object sender, EventArrivedEventArgs e)
{
string usbString;
string vid;
string pid;
string id;
try
{
ManagementBaseObject mbo = (ManagementBaseObject)e.NewEvent["TargetInstance"];
using (ManagementObject o = new ManagementObject(mbo["Dependent"].ToString()))
{
usbString = o.ToString();
AnalyseUSBString(usbString, out vid, out pid, out id);
if (vid == "03EB" && pid == "2018" && int.Parse(id) == _id)
{
_connected = false;
_name = "";
_comPort = "";
_id = 0;
_maxBaudRate = 0;
NotifyUSBConnected();
}
}
}
catch (Exception ex)
{
string test = ex.Message;
if (!ex.Message.Equals("The specified port does not exist."))
NotifyUSBException(string.Format("Exception in USBRemoved event: {0}", ex.Message));
}
}
#endregion
}
}
推荐答案
为了您的目的，我会丢弃您在网上某处找到的代码并查看本文。
C＃中的串口通信初学者 [ ^ ]
因为你有一个USB转RS232转换器，它将枚举为一个或多个虚拟COM端口（VCP）。
在大多数情况下这与连接物理串口相同。
开始与设备通信的方法是通过类SerialPort [ ^ ]。您也可以在那里找到一些入门示例。
For your purpose I would discard the code you found "somewhere on the net" and take a look at this article.
Serial Comms in C# for Beginners[^]
As you have a USB to RS232 converter it will enumerate as one or more Virtual COM Ports (VCP).
In most ways this is the same as connecting to a physical serial port.
The way to start communicating with your device is via the class SerialPort[^]. You can find some starter examples there too.
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