C# 串口通訊

命名空間：

using System.IO.Ports;

實例化：

//public SerialPort(string portName, int baudRate, Parity parity, int dataBits, StopBits stopBits);
//portName:
        //     要使用的端口（例如 COM1）。
        //
        //   baudRate:
        //     波特率。
        //
        //   parity:
        //     System.IO.Ports.SerialPort.Parity 值之一。
        //
        //   dataBits:
        //     數據位值。
        //
        //   stopBits:
        //     System.IO.Ports.SerialPort.StopBits 值之一。
SerialPort serialPortBestCode1 = new SerialPort("COM1", 115200, Parity.None, 8, StopBits.One);

返回函數：

//表示將處理 System.IO.Ports.SerialPort 對象的數據接收事件的方法。
serialPortBestCode1.DataReceived += new SerialDataReceivedEventHandler(Comm_BestCode1DataReceived);

//...
void Comm_BestCode1DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (sender.GetType() != typeof(System.IO.Ports.SerialPort))
            {
                return;
            }
            string strReceive = string.Empty;
            string strCollect = string.Empty;
            System.IO.Ports.SerialPort comPort = (System.IO.Ports.SerialPort)sender;

            try
            {
                comPort.ReceivedBytesThreshold = comPort.ReadBufferSize;
                while (true)
                {
                    strReceive = comPort.ReadExisting();
                    if (string.Equals(strReceive, string.Empty))
                    {
                        break;
                    }
                    else
                    {
                        strCollect += strReceive;
                        Application.DoEvents();
                        Thread.Sleep(100);
                    }
                }
                strCollect = strCollect.Replace("\0", string.Empty);
                strCollect = strCollect.Replace("\r\n", string.Empty);
                strCollect = strCollect.Replace("\r", string.Empty);
                strCollect = strCollect.Replace("\n", string.Empty);
            }
            catch (Exception ex)
            {
                MessageBox.Show("主動異常捕捉：Comm_BestCode1DataReceived函數報錯："+ex.Message);
                //MessageBox.Show(this, ex.ToString(), Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                comPort.ReceivedBytesThreshold = 1;
                if (strCollect.IndexOf("1-1") > -1)
                {
                    Log("成功開啓噴碼機1校驗功能");
                }
                if (strCollect.IndexOf("R") > -1)
                {
                    aTimer.Stop();
                    Log("噴碼機1#校驗成功,收到返回內容：" + strCollect);
                    Thread.Sleep(5000);
                    TestPenma();
                }
            }
        }

數據發送：

public void ModifyBCP1Messages(string[] fields, string[] values)
        {

            try
            {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < fields.Length; ++i)
                {
                    sb.Append(string.Format("^{0} {1}", fields[i], values[i]));
                }
                string cmd = string.Format("^MD{0}\r", sb.ToString());
                if (serialPortBestCode1.IsOpen)
                    serialPortBestCode1.WriteLine(cmd);
            }
            catch (Exception ex)
            {
                MessageBox.Show("主動異常捕捉：ModifyBCP1Messages函數報錯：" + ex.Message);
            }

        }