C#四路继电器usb转com口编程

用到C#在名字空间System.IO.Ports下的SerialPort类来实现功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Timers;
using System.IO.Ports;

namespace ComLibrary
{
    public class EleRelay
    {
        #region 四路继电器属性区域
        private SerialPort mycom = new SerialPort();    //com接口
        private string portName;    //com号
        private bool flag = false;
        private int numFlashing;
        //设置几号灯闪烁
        public int NumFlashing
        {
            set { this.numFlashing = value; }
            get { return this.numFlashing; }
        }
        public Timer tickTimer;
        public string PortName
        {
            set { this.portName = value; }
            get { return this.portName; }
        }
        //控制开关量的指令
        string[] str = {
                           "5501010200000059",
                           "5501010100000058",
                           "5501010002000059",
                           "5501010001000058",
                           "5501010000020059",
                           "5501010000010058",
                           "5501010000000259",
                           "5501010000000158",
                           "550101020202025F",
                           "550101010101015B",
                           "5501010000000057"    //查询当前四个继电器的运行状态
                       };
        #endregion

        #region 四路继电器方法区
        public EleRelay(string PortName)
        {
            mycom.PortName = PortName;  //四路继电器com口名字
            mycom.Parity = Parity.None; //校验位0位
            mycom.StopBits = StopBits.One;  //停止位1位
            mycom.BaudRate = 9600;
            mycom.DataBits = 8;
            tickTimer = new Timer(20);
            tickTimer.Elapsed +=new ElapsedEventHandler(tickTimer_Elapsed);
            //tickTimer.Enabled = true;
            numFlashing = 4; //默认一号灯完成闪烁功能
        }

        //委托在本线程上完成的闪烁功能
        private void tickTimer_Elapsed(object sender, ElapsedEventArgs e)
        {
            if (!flag)
            {
                byte[] data = sendByte(str[(numFlashing - 1) * 2]);
                try
                {

                    mycom.Write(data, 0, data.Length);
                    flag = true;
                }
                catch
                {
                    throw new Exception("四路继电器写命令出错");
                }
            }
            else
            {
                byte[] data = sendByte(str[(numFlashing - 1) * 2 + 1]);
                try
                {
                    mycom.Write(data, 0, data.Length);
                    flag = false;
                    tickTimer.Stop();
                }
                catch
                {
                    throw new Exception("四路继电器写命令出错");
                }
            }
        }

        //获得向串口发送的16进制数据
        private byte[] sendByte(string temps)
        {
            byte[] tempb = new byte[50];
            int j = 0;
            for (int i = 0; i < temps.Length; i = i + 2, j++)
                tempb[j] = Convert.ToByte(temps.Substring(i, 2), 16);
            byte[] send = new byte[j];
            Array.Copy(tempb, send, j);
            return send;
        }

        //打开或者关闭某开关
        private void Switch(int num, bool flag)
        {
            int numInstruct = 0;
            if (flag)
            {
                numInstruct = (num - 1) * 2;
            }
            else
            {
                numInstruct = (num - 1) * 2 + 1;
            }
            byte[] data = sendByte(str[numInstruct]);
            try
            {
                mycom.Write(data, 0, data.Length);
            }
            catch
            {
                throw new Exception("四路继电器写命令出错");
            }
        }

        //打开串口
        public void Open()
        {
            if (mycom.IsOpen)
            {
                mycom.DiscardInBuffer();
                mycom.DiscardOutBuffer();
            }
            else
            {
                try
                {
                    mycom.Open();
                    mycom.DiscardOutBuffer();
                    mycom.DiscardInBuffer();
                }
                catch
                {
                    throw new Exception("继电器串口打开失败");
                }
            }
        }

        //关闭串口
        public void Close()
        {
            if (mycom.IsOpen)
            {
                try
                {
                    mycom.Close();
                }
                catch
                {
                    //不用做进一步的处理
                }
            }
        }
        #endregion
    }
}

转自： http://blog.csdn.net/duksom/article/details/17583081