


How Can I Use WinForms and Visual Studio to Read Data from a USB Serial Port Device?
This code should work with a USB to serial port device, and it may also work with your scale. Some of the port settings were found by downloading/installing WinCT (RsCom, RsKey & RsWeight). Then, in the Windows Start menu under A&D WinCT, select either RsCom or RsKey. Using RsCom or RsKey is an easy way to check that your USB cable/connection is working. I used both "RsKey" and "RsCom" with my USB serial device, and it seemed to work.
Create a WinForms project
VS 2017:
Open Visual Studio
Expand Installed
Expand Visual C#
Click Windows Desktop
Select Windows Forms App (.NET Framework)
Specify project name (name: ReadSerialPort)
Click OK
VS 2019:
Open Visual Studio
Click Continue without code
Click File
Select New
Select Project
C# Windows Desktop
Click Windows Forms App (.NET Framework)
Click Next
Specify project name (name: ReadSerialPort)
Click Create
Note: From this point forward, the process is the same for both VS 2017 and VS 2019.
Add class: SerialPortDataReceivedEventArgs
Note: This class will be used with an event that sends the data received from the serial port device to a subscriber.
On VS menu, select Project
Select Add Class (name: SerialPortDataReceivedEventArgs.cs)
SerialPortDataReceivedEventArgs.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ReadSerialPort { public delegate void SerialPortDataReceivedEventHandler(object sender, SerialPortDataReceivedEventArgs e); public class SerialPortDataReceivedEventArgs : System.EventArgs { public string Data { get; private set; } = string.Empty; public SerialPortDataReceivedEventArgs(string data) { this.Data = data; } } }
Add Reference to System.Management
On VS menu, select Project
Select Add Reference
Expand Assemblies
Check System.Management
Click OK
Add class: ComPorts
On VS menu, select Project
Select Add Class (name: ComPorts.cs)
ComPorts.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ReadSerialPort { public class ComPorts { public List<comportinfo> Ports { get; set; } = new List<comportinfo>(); } public class ComPortInfo { public string Name { get; set; } public string PortName { get; set; } public ComPortInfo() { } public ComPortInfo(string name, string portName) { this.Name = name; this.PortName = portName; } } }</comportinfo></comportinfo>
Add class: HelperSerialPort
On VS menu, select Project
Select Add Class (name: HelperSerialPort.cs)
HelperSerialPort.cs
//if using .NET 5, install NuGet Package: System.IO.Ports
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO.Ports;
using System.Diagnostics;
using System.Management;
namespace ReadSerialPort
{
public enum PortBaudRate : int { Baud1200 = 1200, Baud2400 = 2400, Baud4800 = 4800, Baud9600 = 9600, Baud14400 = 14400, Baud19200 = 19200, Baud28800 = 28800, Baud38400 = 38400 }; public class HelperSerialPort : IDisposable { public delegate void SerialPortErrorReceivedEventHandler(object sender, SerialErrorReceivedEventArgs e); public event SerialPortDataReceivedEventHandler DataReceived; public event SerialPortErrorReceivedEventHandler ErrorReceived; private string _dataReceived = string.Empty; public System.IO.Ports.SerialPort Port { get; private set; } public HelperSerialPort() { //create new instance Port = new SerialPort(); } public string Connect(string comPort, PortBaudRate baudRate = PortBaudRate.Baud9600) { string portName = string.Empty; string result = string.Empty; if (String.IsNullOrEmpty(comPort)) { System.Windows.Forms.MessageBox.Show("COM port not selected.", "Error - COM Port", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error); return "Error: COM port not selected."; } try { if (Port == null) { //create new instance Port = new SerialPort(); } if (!Port.IsOpen) { Debug.WriteLine("opening port"); //create new instance Port = new SerialPort(comPort); //set properties
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