1.准备工作：安装对应驱动程序，安装自带软件（方便测试验证），将万用表连接到电脑，注意要长按万用表上RS232键。
2.将以下代码拷贝，可以直接使用（这里只验证了电流读取的数值准确性，其他单位需要根据实际情况验证下小数点位置）。其中，OnUpdateProgressEvent为日志记录事件。
3.如有需要找到对应通信协议，确认波特率及数据解析方式
需要特别注意：确认波特率是第一步，因为同一型号不同批次的万用表，波特率可能会不同，通信协议中的波特率可能与你硬件也不一致，不同波特率读取出的数据无法正确解析。
public class Victor86E
{
public delegate void UpdateProgresEventsHandler(string uiInfo, string logInfo, MessageType.MsgType msgType);
public static event UpdateProgresEventsHandler OnUpdateProgressEvent;
private SerialPort SerialPortInstance;
private string PortName;
private string LogMsg;
public bool isConnect;
public Victor86E(string name)
{
PortName = name;
Initilize();
}
private void Initilize()
{
SerialPortInstance = new SerialPort();
//if (SerialPortInstance.IsOpen)
//{
// ReleasePort();
// //// Wait a while, for that the port may not be closed immediately.
// //Thread.CurrentThread.Join(Interval);
//}
ReleasePort();
#region Initialize the port
SerialPortInstance.Encoding = Encoding.ASCII;
SerialPortInstance.NewLine = "\n";
SerialPortInstance.RtsEnable = true;
SerialPortInstance.DtrEnable = true;
// Set the port name with the specified name.
SerialPortInstance.PortName = PortName;
SerialPortInstance.ReadTimeout = 1000;
// Set the baud rate with the specified name.
SerialPortInstance.BaudRate = 9600;
// Set the parity with the specified value.
SerialPortInstance.Parity = Parity.None;
// Set the data bits with the specified value.
SerialPortInstance.DataBits = 8;
// Set the stop bits with the specified value
SerialPortInstance.StopBits = StopBits.One;
SerialPortInstance.ReceivedBytesThreshold = 14;
#endregion
try
{
// Open the port for use.
SerialPortInstance.Open();
SerialPortInstance.DiscardInBuffer();
SerialPortInstance.DiscardOutBuffer();
LogMsg = string.Format("SerialDevice Opened {0}", PortName);
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Info);
isConnect= true;
}
catch (Exception ex)
{
LogMsg = string.Format("SerialDevice_Failed_Open:{0}", PortName) + "SerialDevice_More_Details_Colon:" + ex.Message;
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Warning);
isConnect= false;
}
}
public void ReleasePort()
{
if (ReferenceEquals(null, SerialPortInstance))
{
return;
}
try
{
// If the state is OPEN, then close it.
if (SerialPortInstance.IsOpen)
{
SerialPortInstance.Close();
LogMsg = PortName + "SerialDevice_Is_Closed";
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Info);
}
}
catch (Exception ex)
{
LogMsg = string.Format("SerialDevice_Failed_Close_Port_Para:{0}", PortName) + "SerialDevice_More_Details_Colon" + ex.Message;
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Warning);
}
}
public double Read()
{
string format = "";
double v = 0.0;
var str = "";
try
{
if (!SerialPortInstance.IsOpen)
{
Initilize();
Thread.Sleep(100);
}
if (!isConnect)
{
LogMsg = PortName + "未连接。";
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Error);
return 0.0;
}
int n = SerialPortInstance.BytesToRead;
var buf = new byte[n];
SerialPortInstance.Read(buf, 0, n);
var idx = buf.ToList().FindLastIndex(m => m == 0x0A);
if (idx<14)
{
//var hex1 = ByteArrayToHexString(buf).Split(' ');
//for (int i = 0; i < hex1.Count(); i++)
//{
// str += hex1[i];
//}
LogMsg = PortName + "未读到电流";
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Warning);
return 0.0;
}
var data = buf.ToList().GetRange(idx - 13, 14).ToArray();
var hexStr = ByteArrayToHexString(data);
string[] hex;
//去除空格
hexStr = hexStr.Replace(" ", "");
//hex = hexStr.Split(' ');
//var positiveStr = hex[0].Substring(1, 1);
//var formatStr = hex[6].Substring(1, 1);
//value = hex[1].Substring(1, 1) + hex[2].Substring(1, 1) + hex[3].Substring(1, 1) + hex[4].Substring(1, 1) + hex[5].Substring(1, 1);
var positiveStr = hexStr.Substring(1, 1);
var formatStr = hexStr.Substring(13, 1);
var value = hexStr.Substring(3, 1) + hexStr.Substring(5, 1) + hexStr.Substring(7, 1) + hexStr.Substring(9, 1) + hexStr.Substring(11, 1);
var v1 = int.Parse(value);
LogMsg = PortName + "电流读数：" + ByteArrayToHexString(data) + "数值：" + value;
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Info);
switch (int.Parse(formatStr))
{
case 0:
v = v1 * 1.0 / 10;
break;
case 1:
v = v1 * 1.0 / 100;
break;
case 2:
v = v1 * 1.0 / 1000;
break;
case 3:
v = v1 * 1.0 / 10000;
break;
case 4:
v = v1 * 1.0 / 100000;
break;
case 5:
v = v1 * 10.0;
break;
case 6:
v = v1 * 100.0;
break;
case 7:
v = v1 * 1000.0;
break;
}
if (positiveStr.Contains("D"))
{
v = -v;
}
}
catch (Exception ex)
{
LogMsg = PortName + "读取数据错误："+ex.Message;
OnUpdateProgressEvent(LogMsg, LogMsg, MessageType.MsgType.Error);
}
return v;
}
private string ByteArrayToHexString(byte[] decode)
{
var strBuilder = new StringBuilder(decode.Length * 3);
foreach (byte b in decode)
{
strBuilder.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, ' '));
}
return strBuilder.ToString().ToUpper();
}
}
标签：Victor86E,读取,SerialPortInstance,C#,LogMsg,OnUpdateProgressEvent,PortName,public, From： https://www.cnblogs.com/BlueSky2023/p/17027608.html