5 replies to this topic

[Bryan T]

I have an RS232 shield form Cutedigi. When I try to open my serial port, I get the following message: "a first chance exception of type 'System.ArgumentException' occurred in Microsoft.SPOT.Hardware.Serialport.dll" I can give more details if needed. Is this a common error caused by a simple mistake?

[Chris Walker]

Hi Bryan,

I have an RS232 shield form Cutedigi. When I try to open my serial port, I get the following message:

"a first chance exception of type 'System.ArgumentException' occurred in Microsoft.SPOT.Hardware.Serialport.dll"

I can give more details if needed. Is this a common error caused by a simple mistake?

Can you share your code really quick (the few lines that create the SerialPort object and open the SerialPort)?

Chris

[Bryan T]

Chris, thanks for the reply. I actually got it working, but I'm still not sure what was wrong in the first place. I don't have time today, but tomorrow I'll try to recreate the original error and share the code, just so I understand what was happening. Thanks.

[H07R0D]

I just ran into this today, working on talking with this pH Stamp.
Here's the code I'm using:

try
{
    sp = new SerialPort(Serial.COM1, 38400, Parity.None, 0, StopBits.One);
    sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
    sp.Open();

    byte[] message = Encoding.UTF8.GetBytes("R\r");
    Debug.Print(message.ToString());
    sp.Write(message, 0, message.Length);
}
catch (Exception e)
{
    Debug.Print(e.StackTrace);
}

StackTrace is telling me I'm getting an ArgumentException in System.IO.Ports.SerialPort::InternalOpen

[H07R0D]

Well, nevermind.
I just realized I had 0 for data bits, I doubt that will work very well now will it...........

[segu239]

Hi, people Im Luis from argentina,

First I apologize for me english, in my country speek spanish.

 

I have the same problem that bryant. Can you help me ?. thanks

 

using

 

 

System;

 

using

 

 

System.Net;

 

using

 

 

System.Net.Sockets;

 

using

 

 

System.Threading;

 

using

 

 

Microsoft.SPOT;

 

using

 

 

Microsoft.SPOT.Hardware;

 

using

 

 

SecretLabs.NETMF.Hardware;

 

using

 

 

SecretLabs.NETMF.Hardware.NetduinoPlus;

 

//using Microsoft.SPOT.IO;

 

using

 

 

System.IO.Ports;// el libro esta mal antes usaba SPOT ahora usa este, pero igual hay que agregar el ...SPOT.HARDWARE.SerialPort.

 

?

 

?

 

namespace

 

 

puerto_serie_netduino

 

{

 

 

 

public class Program

 

{

 

 

 

public static OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);

 

 

 

static SerialPort serial1;

 

 

 

 

 

 

 

public static void Main()

 

{

 

 

 

try

 

{

 

 

 

SerialPort serial1 = new SerialPort("com2", 9600, Parity.None, 8, StopBits.One);

 

serial1.Open();

 

serial1.DataReceived +=

 

new SerialDataReceivedEventHandler(serial1_DataReceived);

 

}

 

 

 

catch (Exception ex)

 

{

 

 

 

string msg = ex.Message;

 

}

 

 

 

 

 

 

 

 

 

Thread.Sleep(Timeout.Infinite);

 

}

 

 

 

static void serial1_DataReceived(object sender, SerialDataReceivedEventArgs e)

 

{

 

 

 

byte[] buffer = new byte[3];

 

 

 

if (serial1.BytesToRead > 0)

 

{

 

led.Write(

 

true);

 

}

 

}

 

 

 

 

 

}

 

}