communication with RS232

[Sonia Borgi]

Hello

I would like to activate a communication with RS232 port via c sharp, the code is :

 SerialPort sp = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One); 
 try
                    {
                        sp.Open();
                        if (serialPort1.IsOpen)
                        {
                            sp.Write("0");
 
                        }
                        sp.Close();
 
                    }
                    catch (System.Exception)
                    {
                        MessageBox.Show("error");
                    }
 
 
                }

I want to test by hyper terminal, but it don't display nothing.
there is something else to do (a file to download, a manipulation..)

thank you

[Plater]

What is your issue here ?

[alexis4]

I want to test by hyper terminal, but it don't display nothing.
there is something else to do (a file to download, a manipulation..)

To test your code to hyperterminal, you must first make sure about a few things:

1) Your serial card drivers are installed.

2) Your serial cable is OK. Open hyperterminal, then choose port (let's say port3). This port3 will communicate with your application's port1. One edge of the cable goes to port3, the other edge goes to your hand. The pins of the connector are numbered. Short pins 2&3 (so you short Rx&Tx pins), I do this with a simple flat screwdriver. If you type a character in hyperterminal and you see it printed on the screen, then the cable communicates OK. Then do the same thing for port1, just to be sure that you are accessing the right ports. Apart from that, you need the cable to be a cross cable, meaning that you unplug the cable from the pc and you check that pin2 from one side of connector is shorted with pin3 on the other side. You can check this with a ohmmeter. When you are sure of all those, plug one edge on port1, the other on port3. Now you have port1 and 3, ready to communicate with each other.

3) All hyperterminal settings must match your application settings (same baudrate, stopbits, etc).

Hope that helped

[sanathkw]

What is your system (XP , Win7 , vista .....)?