C#串口 上位機怎麽向下位機發送命令和接收下位機上傳的數據

用串口類SerialPort

1、打開串口

public bool ComOpen(int OutTime, string ComNum, int BaudRate)

{

try

{

com.PortName = ComNum;

com.BaudRate = 9600;

com.DataBits = 8;

//com.Parity = Parity.Even;

com.WriteTimeout = OutTime;

com.ReadTimeout = OutTime;

com.Open();

}

catch

{

return false;

//MessageBox.Show("打開串口失敗！", "系統提示");

}

return true;

}

2、先把妳的協議轉換為byte數據，具體的妳自己拼寫，下面的是把妳的字符串轉換為為ascII碼，妳的十六進制的其實是ascII碼形式

ASCIIEncoding MyInfo = new ASCIIEncoding();

byte[] MySend = MyInfo.GetBytes(AlarmCode);

在數組中，起始位壹般是0x02還是0x03啊，忘了，妳自己看著拼壹下

3、串口發送或者接受命令，把妳的數組發送出去或者取出來，都壹樣

public byte[] ComSend(byte[] sendbyte,int SleepTime)

{

//byte[] refbyte = new byte[500];

int reallength;

//try

//{

com.Write(sendbyte, 0, sendbyte.Length);

//return sendbyte;

//}

//catch

//{

// //MessageBox.Show("發送數據失敗！");

// return null;

//}

try

{

reallength = com.BytesToRead;

byte[] refbyte = new byte[reallength];

reallength = com.Read(refbyte, 0, com.BytesToRead);

return refbyte;

}

catch

{

return null;

// MessageBox.Show("接收數據失敗！");

}

}