如何通过串口RS-232或USB转换器将称重秤的重量显示到文本框中？

我被指派使用C＃将称重秤（CAS CI-201A）的重量显示到文本框中。 重量将通过串口RS-232或USB转换器发送。 规模与我同在，但我不知道从哪里开始。 我怎样才能实现目标？

Answer 1

你有没有尝试过任何东西？

如果您想使用串行端口，首先让用户选择使用哪个端口是有意义的。 通过使用所有可用端口填充combobox，可以轻松完成此操作。

private void Form1_Load(object sender, EventArgs e) { string[] portNames = SerialPort.GetPortNames(); foreach (var portName in portNames) { comboBox1.Items.Add(portName); } comboBox1.SelectedIndex = 0; } 

此代码使用带有comboBox的表单，称为“comboBox1”（默认）。 您需要添加：

 using System.IO.Ports; 

使用指令。

然后在表单中添加一个按钮（button1）和一个多行文本框（textbox1）并添加以下代码：

  private void button1_Click(object sender, EventArgs e) { _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One); _serialPort.DataReceived += SerialPortOnDataReceived; _serialPort.Open(); textBox1.Text = "Listening on " + comboBox1.Text + "..."; } private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs) { while(_serialPort.BytesToRead >0) { textBox1.Text += string.Format("{0:X2} ", _serialPort.ReadByte()); } } 

这还需要您添加：

  private SerialPort _serialPort; private const int BaudRate = 9600; 

正好在开头的括号下面

 public partial class Form1 : Form 

单击按钮后，所选comPort中的所有接收数据将在TextBox中显示为hex值。

免责声明：上述代码包含无error handling，如果多次单击button1将导致错误，因为前一个“SerialPort”实例未正确关闭。 使用此示例时请记住这一点。

关心尼科

完整代码：

 using System; using System.IO.Ports; //<-- necessary to use "SerialPort" using System.Windows.Forms; namespace ComPortTests { public partial class Form1 : Form { private SerialPort _serialPort; //<-- declares a SerialPort Variable to be used throughout the form private const int BaudRate = 9600; //<-- BaudRate Constant. 9600 seems to be the scale-units default value public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { string[] portNames = SerialPort.GetPortNames(); //<-- Reads all available comPorts foreach (var portName in portNames) { comboBox1.Items.Add(portName); //<-- Adds Ports to combobox } comboBox1.SelectedIndex = 0; //<-- Selects first entry (convenience purposes) } private void button1_Click(object sender, EventArgs e) { //<-- This block ensures that no exceptions happen if(_serialPort != null && _serialPort.IsOpen) _serialPort.Close(); if (_serialPort != null) _serialPort.Dispose(); //<-- End of Block _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One); //<-- Creates new SerialPort using the name selected in the combobox _serialPort.DataReceived += SerialPortOnDataReceived; //<-- this event happens everytime when new data is received by the ComPort _serialPort.Open(); //<-- make the comport listen textBox1.Text = "Listening on " + _serialPort.PortName + "...\r\n"; } private delegate void Closure(); private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs) { if (InvokeRequired) //<-- Makes sure the function is invoked to work properly in the UI-Thread BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); })); //<-- Function invokes itself else { while (_serialPort.BytesToRead > 0) //<-- repeats until the In-Buffer is empty { textBox1.Text += string.Format("{0:X2} ", _serialPort.ReadByte()); //<-- bytewise adds inbuffer to textbox } } } } } 

Answer 2

首先，在你开始编码任何东西之前，我会检查你是否使用了正确的电缆。 尝试打开您选择的串行终端（HyperTerm，putty）并检查是否有任何数据。

确保在体重秤和终端程序上配置相同的波特率，停止位和奇偶校验。

如果你收到数据（终端程序至少应该显示一些垃圾），那么你可以继续编码。 如果没有，请检查您是否使用了正确的电缆（nullmodem又称为交叉）。

当你到目前为止，那么你可以使用C＃的SerialPort类http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx

Answer 3

基于此：

聆听COM1 … 30 30 33 33 20 49 44 5F 30 30 3A 20 20 20 31 30 2E 36 20 6B 67 20 0D 0A 0D 0A

作为这个的ASCII：

0033 ID_00：10.6千克

您可以通过修剪收到的字符串来获得结果。 假设你的监听器将字节放入数组byte[] serialReceived ：

 string reading = System.Text.Encoding.UTF8.GetString(serialReceived); textBox1.Text = reading.Substring(13); 

Answer 4

我使用的是Anto sujesh的代码，但是我遇到的问题是我从规模中得到的一些值已经损坏了。 我通过缓存缓存文件中的值来解决它。

  private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs) { if (InvokeRequired) //<-- Makes sure the function is invoked to work properly in the UI-Thread BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); })); //<-- Function invokes itself else { int dataLength = _serialPort.BytesToRead; byte[] data = new byte[dataLength]; int nbrDataRead = _serialPort.Read(data, 0, dataLength); if (nbrDataRead == 0) return; string str = Encoding.UTF8.GetString(data); //Buffers values in a file File.AppendAllText("buffer1", str); //Read from buffer and write into "strnew" String string strnew = File.ReadLines("buffer1").Last(); //Shows actual true value coming from scale textBox5.Text = strnew; 

Answer 5

基于adam建议我将输出转换为人类可读格式（从ASCII到UTF8）我将字节放入数组byte []

 private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs) { if (InvokeRequired) //<-- Makes sure the function is invoked to work properly in the UI-Thread BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); })); //<-- Function invokes itself else { int dataLength = _serialPort.BytesToRead; byte[] data = new byte[dataLength]; int nbrDataRead = _serialPort.Read(data, 0, dataLength); if (nbrDataRead == 0) return; string str = System.Text.Encoding.UTF8.GetString(data); textBox1.Text = str.ToString(); } } 

这是完整的工作代码

 using System; using System.IO.Ports; //<-- necessary to use "SerialPort" using System.Windows.Forms; namespace ComPortTests { public partial class Form1 : Form { private SerialPort _serialPort; //<-- declares a SerialPort Variable to be used throughout the form private const int BaudRate = 9600; //<-- BaudRate Constant. 9600 seems to be the scale-units default value public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { string[] portNames = SerialPort.GetPortNames(); //<-- Reads all available comPorts foreach (var portName in portNames) { comboBox1.Items.Add(portName); //<-- Adds Ports to combobox } comboBox1.SelectedIndex = 0; //<-- Selects first entry (convenience purposes) } private void button1_Click(object sender, EventArgs e) { //<-- This block ensures that no exceptions happen if(_serialPort != null && _serialPort.IsOpen) _serialPort.Close(); if (_serialPort != null) _serialPort.Dispose(); //<-- End of Block _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One); //<-- Creates new SerialPort using the name selected in the combobox _serialPort.DataReceived += SerialPortOnDataReceived; //<-- this event happens everytime when new data is received by the ComPort _serialPort.Open(); //<-- make the comport listen textBox1.Text = "Listening on " + _serialPort.PortName + "...\r\n"; } private delegate void Closure(); private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs) { if (InvokeRequired) //<-- Makes sure the function is invoked to work properly in the UI-Thread BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); })); //<-- Function invokes itself else { int dataLength = _serialPort.BytesToRead; byte[] data = new byte[dataLength]; int nbrDataRead = _serialPort.Read(data, 0, dataLength); if (nbrDataRead == 0) return; string str = System.Text.Encoding.UTF8.GetString(data); textBox1.Text = str.ToString(); } } } 

如果您使用的是A＆D EK V校准型号：AND EK-610V。 你使用BaudRate = 2400; 和DataBits = 7

注意：如果你得到这样的输出

您必须检查BaudRate，DataBits（参考您的称重机器手册）或检查您的电缆

Answer 6

 using System; using System.IO; using System.IO.Ports; namespace comport { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private SerialPort _serialPort = null; private void Form1_Load(object sender, EventArgs e) { AppConfiguration.sConfigType = "default"; _serialPort = new SerialPort("COM1", 9600, Parity.None, 8); _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived); _serialPort.Open(); } void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { string data = _serialPort.ReadExisting(); textBox2.Text = data; } } } 

Answer 7

  using System; using System.IO.Ports; using System.Windows.Forms; namespace ComPortTests { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private SerialPort _serialPort = null; private void Form1_Load(object sender, EventArgs e) { _serialPort = new SerialPort("COM1", 9600, Parity.None, 8); _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived); _serialPort.Open(); } void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { string data = _serialPort.ReadExisting(); textBox2.Text = data; } } }