ML3001T_Read_Demo.zip

https://stackoverflow.com/questions/6569882/reading-data-from-mettler-toledo-scale-device-using-c-sharp private SerialPort port = new SerialPort("COM1", 4800, Parity.None, 8, StopBits.One); public Inwardsfrm() { InitializeComponent(); port.DtrEnable = true; port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived); } private void Inwardsfrm_Load(object sender, EventArgs e) { if (port.IsOpen == false) try { port.Open(); } catch (Exception oex) { MessageBox.Show(oex.ToString()); } } private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) { this.Invoke(new EventHandler(DoUpdate)); } private void DoUpdate(object s, EventArgs e) { Thread.Sleep(30); string data = port.ReadExisting() + port.ReadExisting(); try { richTextBox1.Text = data.Trim().Remove(0, 3); } catch (Exception f) { MessageBox.Show(f.Message.ToString()); } } private void DoUpdate(object s, EventArgs e) { Thread.Sleep(30); string data = port.ReadExisting() + port.ReadExisting(); if(data.Trim().Count() < 3) MessageBox.Show("data = " + data); else try { richTextBox1.Text = data.Trim().Remove(0, 3); } catch (Exception f) { MessageBox.Show(f.Message.ToString()); } } ======================================================================================== https://control.com/forums/threads/read-weight-from-mettler-toledo-scale-via-rs232.32068/ I understand that you want to capture Mettler Toledo RS232 port weight data in a VB.NET application. And you are after source code for VB.NET. To query the scale, you need to send an ASCII command: S<CR><LF> To process the returned weight: <?><LF>S S 0.000 lb <?><LF>S S 0.000 g It would be best to extract the value and the units and then implemenmt a switch statement on the units toi convert to a standard weight. I would suggest reading the captured string into a string seperator using space " " as the delimiter such that str[0] = "<?><LF>S" str[1] = "S" str[2] = "0.000" str[3] = "lb|g|kg|..." then process the result Which version of VB are you using? - I might be able to supply VB.NET 2008 code. ========================================================================================= https://stackoverflow.com/questions/9671294/read-weight-from-a-serial-mettler-toledo-digital-scale private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) { this.Invoke(new EventHandler(DoUpdate)); } I faced a problem like this and I solved it changing a COM configuration (Configuration > Comunication > Conections) to SICS in the device. I don't know your scale model but maybe my code can help. https://stackoverflow.com/questions/35483240/reading-data-from-mettler-toledo-ind560-scale-device-using-c-sharp =========================================================================================================== https://stackoverflow.com/questions/10130837/connecting-to-digital-scalemetler-toledo-ps90-as-hid-runs-onreport-only-when-c I am using Mike O Brien's HID Library to connect to digital scale, Device opens successfully then displays device attached & removed messages perfectly. But only runs OnReport for about 20 times initially ================================================= https://docs.microsoft.com/en-us/dotnet/api/system.io.ports.serialport.datareceived?view=netframework-4.8 using System; using System.IO.Ports; class PortDataReceived { public static void Main() { SerialPort mySerialPort = new SerialPort("COM1"); mySerialPort.BaudRate = 9600; mySerialPort.Parity = Parity.None; mySerialPort.StopBits = StopBits.One; mySerialPort.DataBits = 8; mySerialPort.Handshake = Handshake.None; mySerialPort.RtsEnable = true; mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler); mySerialPort.Open(); Console.WriteLine("Press any key to continue..."); Console.WriteLine(); Console.ReadKey(); mySerialPort.Close(); } private static void DataReceivedHandler( object sender, SerialDataReceivedEventArgs e) { SerialPort sp = (SerialPort)sender; string indata = sp.ReadExisting(); Console.WriteLine("Data Received:"); Console.Write(indata); } } ================================================================== https://blog.csdn.net/newbie_xymt/article/details/78178820 一定要在com实例化的时候设置ReceivedBytesThreshold 属性就可以 https://blog.csdn.net/inr12345/article/details/7679538 _serialBluetooth.ReceivedBytesThreshold = 1024; //1KB时触发一次事件， 此设置非常关键。之前设置为1，造成了程序运行起来，将近死程序。 https://blog.csdn.net/HorseRoll/article/details/80493408 ser.Dispose(); ====================================================================== https://blog.csdn.net/u010307521/article/details/50238997 对于读操作，由于串口有dataReceived事件可以监听，这里选择不用线程，而是监听事件。建立一个timer用来扫描第二个comboBox，当第二个comboBox中有选中的时候，事件会被监听到。 private void timer1_Tick(object sender, EventArgs e) { this.AddEventHandlerForResponse(); } private void AddEventHandlerForResponse() { for (int i = 0; i < this.portNames.Length; i++) { try { if (this.portNames.ElementAt(i) == this.portNumberComboBox2.Text.ToString()) { if ((this.serialPorts.ElementAt(i).IsOpen)&&(this.serialPorts.ElementAt(i).BytesToRead > 0)) { this.serialPorts.ElementAt(i).Read(this.portBuffer, 0, this.serialPorts.ElementAt(i).BytesToRead); this.serialPorts.ElementAt(i).DataReceived += new SerialDataReceivedEventHandler(this.DataReceiveEventHandler); } } } catch (IOException eio) { MessageBox.Show("串口异常：" + eio); } } } 上面的代码中出现了处理DataReceived事件的函数this.DataReceiveEventHandler 这里由于串口的读操作相对特殊，串口读取缓冲区数据通过辅助线程进行，进行读操作的时候不能直接修改UI中的内容，所以文本框中的接收内容要通过invoke来实现。 private void DataReceiveEventHandler(object sender, SerialDataReceivedEventArgs e) { SerialPort sp = (SerialPort)sender; this.receiveTextBox.Invoke( new MethodInvoker( delegate { this.receiveTextBox.AppendText(sp.ReadExisting()); this.receiveTextBox.Text += " "; } ) ); } ================================================================================ https://blog.csdn.net/qq_30725967/article/details/89149551 C# SerialPort串口通信发送接收,处理接收数据完整 ================================================================================ https://www.cnblogs.com/rorysix/p/8038338.html [填坑]SerialPort的“端口被关闭” 一年前用winform给公司做了一个软件，用到了电子秤，因此使用了SerialPort来读串口数据。 做完后，DataReceived事件里偶尔出现“端口被关闭”错误，都是在关闭串口后出现。 （出错位置要么是读数据ReadLine，要么时清除缓存DiscardInBuffer） 当时研究了半天没解决，想着影�