C#串口通讯02

public class BDSerialPortParam
    {
        /// 

        /// 串口号
        /// 
        public string portName { get; set; }
        /// 

        /// 波特率
        /// 
        public int baudRate { get; set; }
        /// 

        /// 数据位
        /// 
        public int dataBits { get; set; }
        /// 

        /// 校验位
        /// 
        public Parity parity { get; set; }
        /// 

        /// 停止位
        /// 
        public StopBits stopBits { get; set; }
    }

此串口使用的是modbus通讯 buffer[]数组是需要发送的指令，其中0x01是设备站号，0x03是功能码，0x44和0x0C是CRC校验码，可通过文档给的方法计算出来，具体可以查看相应的说明书会有详细的说明。

public class BD4320SerialPort
    {

        public static SerialPort Serial;
        /// 

        /// 用于存储5个通道得温度
        /// 
        double[] TemperatureList = new double[5];
        /// 

        /// 发送给bd的字节数组
        /// 
        byte[] buffer = new byte[8];
        /// 

        /// 判断BD4320E是否连接
        /// 
        public bool IsConnection = true;
        /// 

        /// 初始化串口
        /// 
        /// 执行结果
        private bool InitialSerialPort( BDSerialPortParam mySerial)
        {
            if (Serial == null)
            {
                Serial = new SerialPort();
                Serial.PortName = mySerial.portName;
                Serial.BaudRate = mySerial.baudRate;
                Serial.DataBits = mySerial.dataBits;
                Serial.Parity = mySerial.parity;
                Serial.StopBits = mySerial.stopBits;

                buffer[0] = 0x01;
                buffer[1] = 0x03;
                buffer[2] = 0x00;
                buffer[3] = 0x00;
                buffer[4] = 0x00;
                buffer[5] = 0x08;
                buffer[6] = 0x44;
                buffer[7] = 0x0C;
            }
            else
            {
                Serial.Open();
                return true;
            }
            try
            {
                Serial.ReadTimeout = 1000;
                Serial.WriteTimeout = 500;
                Serial.Open();
                Serial.DtrEnable = true;
                Serial.RtsEnable = false;
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }
        /// 

        /// 写入并读取
        /// 
        public double[] WriteAndRead(ref string msg)
        {
            try
            {
                msg = "";
                for (int i = 0; i < TemperatureList.Length; i++)
                {
                    TemperatureList[i] = 999.9;
                }
                Serial.Write(buffer, 0, buffer.Length);
                Thread.Sleep(60);
                int n = Serial.BytesToRead;
                byte[] receivebBuffer = new byte[n];
                Serial.Read(receivebBuffer, 0, n);
                //返回前3个字节是头报文  ((receivebBuffer[i] << 8) | receivebBuffer[i + 1])
                
                for (int i = 3, j = 0; i + 2 < receivebBuffer.Length && j < 5; i = i + 2, j++)
                {
                    TemperatureList[j] = ((receivebBuffer[i] << 8) | receivebBuffer[i + 1]) / 10.0;
                }
                IsConnection = true;
                return TemperatureList;
            }
            catch (Exception ex)
                {
                    IsConnection = false;
                    msg = ex.Message;
                    return TemperatureList;
                }
        }
        /// 

        /// 关闭串口资源
        /// 
        /// 消息
        /// 
        public bool ClosePort(ref string strMessage)
        {
            try
            {
                if (Serial == null)
                {
                    strMessage = "串口未实例化！";
                    return true;
                }
                if (Serial.IsOpen)
                {
                    Serial.Close();
                    if (Serial.IsOpen == false)
                    {
                        strMessage = "串口成功关闭！";
                        return true;
                    }
                    else
                    {
                        strMessage = "串口关闭失败！";
                        return false;
                    }
                }
                else
                {
                    strMessage = "串口未打开！";
                    return true;
                }
            }
            catch (Exception ex)
            {
                strMessage = ex.Message;
                Serial.Dispose();
                return false;
            }
        }

        /// 

        /// 构造函数
        /// 
        /// 
        public BD4320SerialPort(BDSerialPortParam mySerial)
        {
            InitialSerialPort(mySerial);
        }
    }