while i input "at" to serialport in my program,but return "at" not as excepted "ok"?
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in my C# program,i input "at" in a textBox,then the program send "at" to serialport,but when i click receive button,the message I receive from serial port is the same as I input,namely "at",not "ok",why?who can answer my question?How I solve this problem and get the right response "ok" from serial port? next is my code: public partial class Form1 : Form { private SerialPort sp = null; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { try { sp = new SerialPort("COM1"); sp.ReadTimeout = 5000; sp.Open(); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void button2_Click(object sender, EventArgs e) { try { sp.Write(textBox1.Text); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void button3_Click(object sender, EventArgs e) { try { /*string text=null; char[] buffer = new char[10]; sp.Read(buffer,0,6); for (int i = 0; i < buffer.Length; i++) { text += buffer[i]; } textBox2.Text = text;*/ /*string text = null; char t = (char)sp.ReadChar(); text+=t.ToString(); while (true) { t = (char)sp.ReadChar(); if (t == '\0') break; else text += t.ToString(); } textBox2.Text = text;*/ string text = null; byte[] t = new byte[20]; char[] c = new char[20]; sp.Read(t, 0, t.Length); sp.Read(t, 0, t.Length); c = Encoding.ASCII.GetChars(t); int i; for (i = 0; i < c.Length; i++) { if (c[i] == 'O' || c[i] == 'K') text += c[i].ToString(); } textBox2.Text = text; } catch (Exception ex) { MessageBox.Show(ex.Message);