西夏普的部落格

1.前言
以程式遠端讀取電子天平秤重數值，可將資料存檔紀錄歷史數據。

2.說明
本範例是針對Precisa Balances進行RS232遠端連線控制儀器，首先要做一條RJ45轉RS232的連接線(儀器端為RJ45接口，電腦端為RS232接口)，RJ45端口接線配置與遠端控制的命令可參考原廠的操作說明書，這裡舉PRINT控制命令做說明。
PRT: Start printing(Press "Print" key)

加入命名空間

using System.IO.Ports;

加入serialPort，設定屬性

BaudRate:9600
DataBits:8
Parity:None
StopBits:One

Form_Load加入資料接收處理事件

private void Form1_Load(object sender, EventArgs e)
{
	serialPort1.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
}

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
	System.Threading.Thread.Sleep(100);
	string message = serialPort1.ReadExisting();
	SaveData(message);
}

儲存資料

private void SaveData(string message)
{
	string _sign = "";
	double _weight = 0;
	string _unit = "";
	string _datetime = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
	_sign = message.Substring(3, 1);
	if (_sign == "-") _weight = -double.Parse(message.Substring(4, 9));
	if (_sign == "+") _weight = double.Parse(message.Substring(4, 9));
	_unit = message.Substring(15, 3);
	Console.WriteLine(_weight.ToString());
}

傳送命令

private void SendCommand(string command)
{
	serialPort1.Write(command);
}

遠端下控制命令

string cmd = "PRT\r\n";
SendCommand(cmd);