C# 一台电脑对接多个串口通讯实例（电子天平称）

比如：我们在对接串口硬件时。实时获取硬件发送过来的数据、比如获取电子称发送过来的结果。我们程序需要获取。还有一种情况 是一台电脑对接多个串口设备情况下如何开发。

1.封装一个OpenSerialPort实体类

using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestGetUnitek
{
    public class OpenSerialPort
    {
        private SerialPort Sp = new SerialPort();

        public class SerialPortModel
        {
            /// <summary>
            /// 端口号
            /// </summary>
            public string PortName { get; set; }

            /// <summary>
            /// 波特率
            /// </summary>
            public int BaudRate { get; set; }

            /// <summary>
            /// 奇偶验证
            /// </summary>
            public Parity Parity { get; set; }

            /// <summary>
            /// 停止位
            /// </summary>
            public StopBits StopBits { get; set; }

            /// <summary>
            /// 数据位
            /// </summary>
            public int DataBits { get; set; }

        }

        public OpenSerialPort(SerialPortModel entity)
        {
            //绑定对象信息
            Sp.PortName = entity.PortName;
            Sp.BaudRate = entity.BaudRate;
            Sp.Parity = entity.Parity;
            Sp.StopBits = entity.StopBits;
            Sp.DataReceived += new SerialDataReceivedEventHandler(Sp_DataReceived);
            Sp.ReceivedBytesThreshold = 1;
            Sp.DataBits = entity.DataBits;
        }

        /// <summary>
        /// 打开端口
        /// </summary>
        /// <returns></returns>
        public string Open()
        {
            try
            {
                Sp.Open();
                return "1";
            }
            catch (Exception a)
            {
                return a.Message;
            }
        }

        //实时获取数据
        public void Sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            System.Threading.Thread.Sleep(100);//延迟100接收
            Byte[] reData = new byte[Sp.BytesToRead];
            //获取
            Sp.Read(reData, 0, reData.Length);
            string msg = Encoding.ASCII.GetString(reData);
            string ComName = Sp.PortName;
            //释放
            Sp.DiscardInBuffer();
            
        }

        //关闭端口
        public string Close()
        {
            try
            {
                Sp.Close();
                return "1";
            }
            catch (Exception a)
            {
                return a.Message;
            }
        }
    }
}

2.然后在执行的地方。通过对象列表去获取多台设备信息以及启动

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using static TestGetUnitek.OpenSerialPort;

namespace TestGetUnitek
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        private DBSql db = new DBSql(ConfigurationManager.AppSettings["conn"], DbProviderType.SqlServer);
        private void button1_Click(object sender, EventArgs e)
        {
            DataTable dt = db.ExecuteDataTable("SELECT COM,baudRate,DataBits,Parity,StopBits FROM T_GPM_SerialPortConfig", null);
            List<OpenSerialPort> list = new List<OpenSerialPort>();
            foreach (DataRow dr in dt.Rows)
            {

                SerialPortModel model = new SerialPortModel();
                var COM = dr["COM"].ToString();
                var BaudRate = dr["BaudRate"].ToString();
                var _Parity = dr["Parity"].ToString();
                var _StopBits = dr["StopBits"].ToString();
                var DataBits = dr["DataBits"].ToString();

                model.PortName = COM;
                model.BaudRate = Convert.ToInt32(BaudRate);
                if (_Parity == "0")
                {
                    model.Parity = Parity.None;
                }
                else if (_Parity == "1")
                {
                    model.Parity = Parity.Odd;
                }
                else if (_Parity == "2")
                {
                    model.Parity = Parity.Even;
                }
                model.StopBits = StopBits.One;
                model.DataBits = Convert.ToInt32(DataBits);

                OpenSerialPort s = new OpenSerialPort(model);
                list.Add(s);
            }
            foreach(var item in list)
            {
                //Thread thread = new Thread(new ThreadStart());//创建线程
                //thread.Start();                                                           //启动线程
                item.Open();
            }

            button1.Enabled = false;
        }

        public void UpdateTextBox(string text)
        {
            this.textBox1.Text = text;
        }


    }
}

可以实现1-多台设备运行。获取回来的结果业务在写OpenSerialPort类的Sp_DataReceived方法里面