Unable to obtain a specified output sequence in RS232 communication

[donSalvatore]

Hi to everyone.
I wrote a program in C# that implements a RS232 communication but I decided to use not the Framework SerialPort class.
The reason of this choiche is the need to replicate a specified output sequence obtained by a serial port monitor (I use this free serial monitor (http://www.serial-port-monitor.com/Download/free-serial-port-monitor.exe))

Output to replicate:


0,IRP_MJ_CREATE,DOWN,TRUE,0x0,...,
1,IRP_MJ_CREATE,UP,FALSE,0x0,,,
2,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW: Set handshake information),DOWN,TRUE,0x0,00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ,................,
3,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW: Set handshake information),UP,FALSE,0x0,,,
4,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_QUEUE_SIZE: Set queue size),DOWN,TRUE,0x0,00 00 00 00 00 00 00 00 ,........,
5,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_QUEUE_SIZE: Set queue size),UP,FALSE,0x0,,,
6,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_TIMEOUTS: Set timeouts),DOWN,TRUE,0x0,FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ,ÿÿÿÿ................,
7,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_TIMEOUTS: Set timeouts),UP,FALSE,0x0,,,
8,IRP_MJ_DEVICE_CONTROL,DOWN,TRUE,0x0,00 00 00 00 ,....,
9,IRP_MJ_DEVICE_CONTROL,UP,FALSE,0x0,,,
10,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_CLR_RTS: Clear RTS),DOWN,FALSE,0x0,,,
11,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_CLR_RTS: Clear RTS),UP,FALSE,0x0,,,
12,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_DTR: Set DTR),DOWN,FALSE,0x0,,,
13,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_DTR: Set DTR),UP,FALSE,0x0,,,
14,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),DOWN,TRUE,0x0,80 25 00 00 ,€%..,
15,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),UP,FALSE,0x0,,,
16,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),DOWN,TRUE,0x0,00 00 08 ,...,
17,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),UP,FALSE,0x0,,,
18,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_WAIT_MASK: Set current event mask),DOWN,TRUE,0x0,0D 00 00 00 ,....,
19,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_WAIT_MASK: Set current event mask),UP,FALSE,0x0,,,
20,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),DOWN,FALSE,0x0,,,
21, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),DOWN,TRUE,0x0,80 25 00 00 ,€%..,
22, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),UP,FALSE,0x0,,,
23, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),DOWN,TRUE,0x0,00 00 08 ,...,
24, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),UP,FALSE,0x0,,,
25, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_RTS: Set RTS),DOWN,FALSE,0x0,,,
26, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_RTS: Set RTS),UP,FALSE,0x0,,,
27,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),UP,TRUE,0x0,08 00 00 00 ,....,
28,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_GET_MODEMSTATUS: Retrieve modem status),DOWN,FALSE,0x0,,,
29,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_GET_MODEMSTATUS: Retrieve modem status),UP,TRUE,0x0,10 00 00 00 ,....,
30,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),DOWN,TRUE,0x0,FF ,ÿ,
31, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),DOWN,FALSE,0x0,,,
32, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),UP,FALSE,0x0,,,
33,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),UP,TRUE,0x0,01 00 00 00 ,....,
34,IRP_MJ_CLOSE,DOWN,FALSE,0x0,,,
35,IRP_MJ_CLOSE,UP,FALSE,0x0,,,



Output obtained:


0,IRP_MJ_CREATE,DOWN,TRUE,0x0,54 00 65 00 73 00 74 00 41 00 70 00 70 00 43 00 6F 00 6E 00 73 00 6F 00 6C 00 65 00 2E 00 76 00 73 00 68 00 6F 00 73 00 74 00 2E 00 65 00 78 00 65 00 00 00 ,T.e.s.t.A.p.p.C.o.n.s.o.l.e...v.s.h.o.s.t...e.x.e...,
1,IRP_MJ_CREATE,UP,FALSE,0x0,,,
2,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW: Set handshake information),DOWN,TRUE,0x0,00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ,................,
3,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW: Set handshake information),UP,FALSE,0x0,,,
4,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_QUEUE_SIZE: Set queue size),DOWN,TRUE,0x0,00 00 00 00 00 00 00 00 ,........,
5,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_QUEUE_SIZE: Set queue size),UP,FALSE,0x0,,,
6,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_TIMEOUTS: Set timeouts),DOWN,TRUE,0x0,FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ,ÿÿÿÿ................,
7,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_TIMEOUTS: Set timeouts),UP,FALSE,0x0,,,
8,IRP_MJ_DEVICE_CONTROL,DOWN,TRUE,0x0,00 00 00 00 ,....,
9,IRP_MJ_DEVICE_CONTROL,UP,FALSE,0x0,,,
10,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_CLR_RTS: Clear RTS),DOWN,FALSE,0x0,,,
11,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_CLR_RTS: Clear RTS),UP,FALSE,0x0,,,
12,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_DTR: Set DTR),DOWN,FALSE,0x0,,,
13,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_DTR: Set DTR),UP,FALSE,0x0,,,
14,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),DOWN,TRUE,0x0,80 25 00 00 ,€%..,
15,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),UP,FALSE,0x0,,,
16,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),DOWN,TRUE,0x0,00 00 08 ,...,
17,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),UP,FALSE,0x0,,,
18,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_WAIT_MASK: Set current event mask),DOWN,TRUE,0x0,0D 00 00 00 ,....,
19,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_WAIT_MASK: Set current event mask),UP,FALSE,0x0,,,
20,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),DOWN,FALSE,0x0,,,
21, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),DOWN,TRUE,0x0,80 25 00 00 ,€%..,
22, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate),UP,FALSE,0x0,,,
23, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),DOWN,TRUE,0x0,00 00 08 ,...,
24, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_LINE_CONTROL: Set line control),UP,FALSE,0x0,,,
25, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_RTS: Set RTS),DOWN,FALSE,0x0,,,
26, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_RTS: Set RTS),UP,FALSE,0x0,,,
27,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),UP,TRUE,0x0,08 00 00 00 ,....,
28,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_GET_MODEMSTATUS: Retrieve modem status),DOWN,FALSE,0x0,,,
29,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_GET_MODEMSTATUS: Retrieve modem status),UP,TRUE,0x0,10 00 00 00 ,....,
30,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),DOWN,TRUE,0x0,FF ,ÿ,
31,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),UP,FALSE,0x0,,,
32,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),DOWN,TRUE,0x0,FF ,ÿ,
33, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),DOWN,FALSE,0x0,,,
34, IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK: Wait for event),UP,TRUE,0x0,05 00 00 00 ,....,
35,IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_IMMEDIATE_CHAR: Transmit immediate character),UP,FALSE,0x0,,,
36,IRP_MJ_CLOSE,DOWN,FALSE,0x0,,,
37,IRP_MJ_CLOSE,UP,FALSE,0x0,,,



As you can notice, the differences are from the line 30 until the end of the logs.

Here's the first half of the code (the second one is added as reply to this post due to the text limit):

Main.cs


#region Using

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

#endregion

namespace TestAppConsole
{
class Program
{
static void Main()
{
SerialPort serialPort = new SerialPort();
serialPort.Connect();
OverlappedFunction[] functionToOverlap =
{
OverlappedFunction.SetBaudRate,
OverlappedFunction.SetLineControl,
OverlappedFunction.SetRts
};
uint setCommMask = 0x000D;
byte byteToSend = 0xFF;
serialPort.OverlapCommMask(functionToOverlap, setCommMask);
Thread.Sleep(14);
serialPort.GetModemStatus();
serialPort.TransmitCharOverlap(byteToSend);
serialPort.Disconnect();
}
}
}



Win32Methods.cs


#region Using

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using System.Threading;

#endregion

namespace TestAppConsole
{
[System.Security.SuppressUnmanagedCodeSecurityAttribute()]
internal class Win32Methods
{
#region Constant definition

public const int
INVALID_HANDLE_VALUE = (-1),
NULL = 0,
ERROR_SUCCESS = 0,
FILE_READ_DATA = (0x0001),
FILE_SHARE_READ = 0x00000001,
OPEN_EXISTING = 3,
GENERIC_READ = unchecked((int)0x80000000),
GENERIC_WRITE = unchecked((int)0x40000000),
METHOD_BUFFERED = 0,
METHOD_NEITHER = 3,
FILE_ANY_ACCESS = 0,
FILE_DEVICE_UNKNOWN = 0x00000022,
FILE_DEVICE_VIRTUAL_DISK = 0x00000024,
FILE_DEVICE_SERIAL_PORT = 0x0000001B,

ERROR_IO_PENDING = 997,
WAIT_ABANDONED = 0x00000080,
WAIT_OBJECT_0 = 0x00000000,
WAIT_TIMEOUT = 0x00000102,
FILE_FLAG_OVERLAPPED = 0x40000000,

/* IOCTL_SERIAL_(GET_WAIT_MASK, SET_WAIT_MASK, WAIT_ON_MASK) flags */
SERIAL_EV_RXCHAR = 0x0001,
SERIAL_EV_RXFLAG = 0x0002,
SERIAL_EV_TXEMPTY = 0x0004,
SERIAL_EV_CTS = 0x0008,
SERIAL_EV_DSR = 0x0010,
SERIAL_EV_RLSD = 0x0020,
SERIAL_EV_BREAK = 0x0040,
SERIAL_EV_ERR = 0x0080,
SERIAL_EV_RING = 0x0100,
SERIAL_EV_PERR = 0x0200,
SERIAL_EV_RX80FULL = 0x0400,
SERIAL_EV_EVENT1 = 0x0800,
SERIAL_EV_EVENT2 = 0x1000,

/* IOCTL_SERIAL_SET_FIFO_CONTROL constants */
SERIAL_IOC_FCR_FIFO_ENABLE = 0x00000001,
SERIAL_IOC_FCR_RCVR_RESET = 0x00000002,
SERIAL_IOC_FCR_XMIT_RESET = 0x00000004,
SERIAL_IOC_FCR_DMA_MODE = 0x00000008,
SERIAL_IOC_FCR_RES1 = 0x00000010,
SERIAL_IOC_FCR_RES2 = 0x00000020,
SERIAL_IOC_FCR_RCVR_TRIGGER_LSB = 0x00000040,
SERIAL_IOC_FCR_RCVR_TRIGGER_MSB = 0x00000080;

#endregion

#region Structs definition

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SECURITY_ATTRIBUTES
{
public int nLength; // DWORD
public IntPtr lpSecurityDescriptor; // LPVOID
public int bInheritHandle; // BOOL
}

#endregion

#region Methods

[DllImport("kernel32.dll")]
public static unsafe extern bool CloseHandle(int hHandle);

// CreateFile is is Overloaded for having SecurityAttributes or not

[DllImport("kernel32.dll")]
public static unsafe extern int CreateFile(String lpFileName, int dwDesiredAccess,
int dwShareMode, IntPtr lpSecurityAttributes, int dwCreationDisposition,
int dwFlagsAndAttributes, int hTemplateFile);

[DllImport("kernel32.dll")]
public static unsafe extern int CreateFile(String lpFileName, int dwDesiredAccess,
int dwShareMode, SECURITY_ATTRIBUTES lpSecurityAttributes,
int dwCreationDisposition, int dwFlagsAndAttributes, int hTemplateFile);

[DllImport("kernel32.dll")]
public static unsafe extern bool TransmitCommChar(IntPtr hFile, Byte cChar);

[DllImport("kernel32.dll")]
public static unsafe extern bool DeviceIoControl(int hDevice, int dwIoControlCode,
byte[] InBuffer, int nInBufferSize, byte[] OutBuffer, int nOutBufferSize,
ref int pBytesReturned, int pOverlapped);

[DllImport("kernel32.dll")]
public static unsafe extern bool DeviceIoControl(int hDevice, int dwIoControlCode,
byte[] InBuffer, int nInBufferSize, byte[] OutBuffer, int nOutBufferSize,
ref int pBytesReturned, ref NativeOverlapped pOverlapped);

[DllImport("kernel32.dll")]
public static unsafe extern bool DeviceIoControl(int hDevice, int dwIoControlCode,
int[] InBuffer, int nInBufferSize, int[] OutBuffer, int nOutBufferSize,
ref int pBytesReturned, int pOverlapped);

[DllImport("kernel32.dll")]
public static extern bool SetCommMask(int hFile, uint lpEvtMask);

[DllImport("kernel32.dll")]
public static extern IntPtr CreateEvent(IntPtr lpEventAttributes,
bool bManualReset, bool bInitialState, string lpName);

[DllImport("kernel32", SetLastError = true)]
public static extern UInt32 WaitForSingleObject(IntPtr handle,
Int32 milliseconds);

[DllImport("kernel32.dll", SetLastError = true)]
public static extern int WaitCommEvent(int hFile, ref int lpEvtMask,
ref NativeOverlapped lpOverlapped);

[DllImport("kernel32.dll", SetLastError = true)]
public static extern bool ReadFile(IntPtr hFile, [Out] byte[] lpBuffer,
uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead,
ref NativeOverlapped lpOverlapped);

[DllImport("kernel32.dll", SetLastError = true)]
public static extern bool WriteFile(IntPtr hFile, byte[] lpBuffer,
uint nNumberOfBytesToWrite, out uint lpNumberOfBytesWritten,
ref NativeOverlapped lpOverlapped);

// These replace Macros in winioctl.h

public static unsafe int CTL_CODE(int DeviceType, int Function, int Method,
int Access)
{
return (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2)
| (Method));
}

public int DEVICE_TYPE_FROM_CTL_CODE(int ctrlCode)
{
return (int)((ctrlCode & 0xffff0000) >> 16);
}

#endregion
}
}



Can anyone help me to obtain the output to replicate?
Thanks in advance.

[donSalvatore]

Second half of the code:

SerialPort.cs


#region Using

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Runtime.InteropServices;

#endregion

namespace TestAppConsole
{
sealed internal class SerialPort
{
#region Class definition

public SerialPort()
{
}

#endregion

#region Methods

public void Connect()
{
fileHandle = Win32Methods.CreateFile(PortName,
Win32Methods.GENERIC_READ | Win32Methods.GENERIC_WRITE,
0, (IntPtr)0, Win32Methods.OPEN_EXISTING, Win32Methods.FILE_FLAG_OVERLAPPED,
Win32Methods.NULL);
if (fileHandle == Win32Methods.INVALID_HANDLE_VALUE)
{
throw new Exception("Connection not estabilished!");
}
SetHandFlow();
SetQueueSize();
SetTimeOut();
SetFifoControl();
ClearRts();
SetDtr();
SetBaudRate(BaudRate);
SetLineControl();
}

public void Disconnect()
{
Win32Methods.CloseHandle(fileHandle);
}

public void OverlapCommMask(OverlappedFunction[] overlappedFunctions, uint setCommMask)
{
bool fWaitingOnStat = false;
bool cycleActive = true;
NativeOverlapped osStatus = new NativeOverlapped();
osStatus.EventHandle = Win32Methods.CreateEvent((IntPtr)null, true, false, null);

if (osStatus.EventHandle == (IntPtr)null)
{
// error creating event; abort
cycleActive = false;
}


for (; cycleActive; )
{
// Issue a status event check if one hasn't been issued already.
if (!fWaitingOnStat)
{
int lpEvtMask = 0;
SetCommMask(setCommMask);
if (WaitCommEvent(ref lpEvtMask, ref osStatus) == 0)
{
if (Marshal.GetLastWin32Error() == Win32Methods.ERROR_IO_PENDING)
{
fWaitingOnStat = true;
}
else
{
// error in WaitCommEvent; abort
break;
}
}
}

// Check on overlapped operation.
if (fWaitingOnStat)
{
// Wait a little while for an event to occur.
UInt32 waitForSingleObjectResponse =
Win32Methods.WaitForSingleObject(osStatus.EventHandle, 14);
if (waitForSingleObjectResponse == Win32Methods.WAIT_OBJECT_0)
{
fWaitingOnStat = false;
}
else if (waitForSingleObjectResponse == Win32Methods.WAIT_TIMEOUT)
{
foreach (OverlappedFunction overlappedFunction in overlappedFunctions)
{
executeOverlappedFunction(overlappedFunction);
}
break;
}
}
}
Win32Methods.CloseHandle((int)osStatus.EventHandle);
}

public void TransmitCharOverlap(byte charToSend)
{
bool fWaitingOnStat = false;
bool cycleActive = true;
NativeOverlapped osStatus = new NativeOverlapped();
NativeOverlapped osStatus_2 = new NativeOverlapped();
osStatus.EventHandle = Win32Methods.CreateEvent((IntPtr)null, true, false, null);

if (osStatus.EventHandle == (IntPtr)null)
{
// error creating event; abort
cycleActive = false;
}

for ( ; cycleActive; )
{
// Issue a status event check if one hasn't been issued already.
if (!fWaitingOnStat)
{
if (TransmitCommCharDeviceIO(charToSend, ref osStatus))
{
// end of the operation
break;
}
else
{
if (Marshal.GetLastWin32Error() == Win32Methods.ERROR_IO_PENDING)
{
fWaitingOnStat = true;
}
else
{
// error in TransmitCommCharDeviceIO; abort
break;
}
}
}

// Check on overlapped operation.
if (fWaitingOnStat)
{
// Wait a little while for an event to occur.
UInt32 waitForSingleObjectResponse = Win32Methods.WaitForSingleObject(osStatus.EventHandle, 0);
if (waitForSingleObjectResponse == Win32Methods.WAIT_OBJECT_0)
{
fWaitingOnStat = false;
}
else if (waitForSingleObjectResponse == Win32Methods.WAIT_TIMEOUT)
{
osStatus_2.EventHandle = Win32Methods.CreateEvent((IntPtr)null, true, false, null);
int lpEvtMask = 0;
WaitCommEvent(ref lpEvtMask, ref osStatus_2);
Win32Methods.CloseHandle((int)osStatus_2.EventHandle);
break;
}
}
}
Win32Methods.CloseHandle((int)osStatus.EventHandle);
Win32Methods.CloseHandle((int)osStatus_2.EventHandle);
}

public bool TransmitCommCharDeviceIO(byte charToSend, ref NativeOverlapped osStatus)
{
byte[] buffer = new byte[1];
buffer[0] = charToSend;
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 6, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return WriteChar(buffer, controlCode, 0, ref osStatus);
}

public bool WriteChar(byte[] buffer, int controlCode, int outputBufferLength,
ref NativeOverlapped osStatus)
{
byte[] outputBuffer = new byte[outputBufferLength];
int bytesReturned = new int();
return Win32Methods.DeviceIoControl(fileHandle, controlCode, buffer, buffer.Length,
outputBuffer, outputBufferLength, ref bytesReturned, ref osStatus);
}

public bool SetCommMask(uint eventToMask)
{
return Win32Methods.SetCommMask(fileHandle, eventToMask);
}

public int WaitCommEvent(ref int lpEvtMask, ref NativeOverlapped osStatus)
{
return Win32Methods.WaitCommEvent(fileHandle, ref lpEvtMask, ref osStatus);
}

public bool SetHandFlow()
{
byte[] buffer = new byte[16];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 25, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetQueueSize()
{
byte[] buffer = new byte[8];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 2, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetTimeOut()
{
byte[] buffer = new byte[20];
for (int i = 0; i < 4; i++)
{
buffer[i] = 0xFF;
}

int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 7, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetFifoControl()
{
byte[] buffer = new byte[4];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 39, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool ClearRts()
{
byte[] buffer = new byte[0];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 13, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetDtr()
{
byte[] buffer = new byte[0];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 9, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetBaudRate(int baudRate)
{
byte[] buffer = new byte[4];
buffer[0] = (byte)(baudRate % 256);
buffer[1] = (byte)((baudRate / 256) % 256);
buffer[2] = (byte)((baudRate / 65536) % 256);

int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 1, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetLineControl()
{
byte[] buffer = new byte[3];
buffer[0] = 0x00;
buffer[1] = 0x00;
buffer[2] = 0x08;

int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 3, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool SetRts()
{
byte[] buffer = new byte[0];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 12, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 0);
}

public bool GetModemStatus()
{
byte[] buffer = new byte[0];
int controlCode = Win32Methods.CTL_CODE(
Win32Methods.FILE_DEVICE_SERIAL_PORT, 26, Win32Methods.METHOD_BUFFERED,
Win32Methods.FILE_ANY_ACCESS);
return Write(buffer, controlCode, 4);
}

public bool Write(byte[] buffer, int controlCode, int outputBufferLength)
{
byte[] outputBuffer = new byte[outputBufferLength];
int bytesReturned = new int();
return Win32Methods.DeviceIoControl(fileHandle, controlCode, buffer, buffer.Length,
outputBuffer, outputBufferLength, ref bytesReturned, 0);
}

private object executeOverlappedFunction(OverlappedFunction overlappedFunction)
{
object result;
switch (overlappedFunction)
{
case OverlappedFunction.SetHandFlow:
result = SetHandFlow();
break;
case OverlappedFunction.SetQueueSize:
result = SetQueueSize();
break;
case OverlappedFunction.SetTimeOut:
result = SetTimeOut();
break;
case OverlappedFunction.SetFifoControl:
result = SetFifoControl();
break;
case OverlappedFunction.ClearRts:
result = ClearRts();
break;
case OverlappedFunction.SetDtr:
result = SetDtr();
break;
case OverlappedFunction.SetBaudRate:
result = SetBaudRate(BaudRate);
break;
case OverlappedFunction.SetLineControl:
result = SetLineControl();
break;
case OverlappedFunction.SetRts:
result = SetRts();
break;
case OverlappedFunction.GetModemStatus:
default:
result = GetModemStatus();
break;
}
return result;
}

#endregion

#region Properties

private int fileHandle = Win32Methods.INVALID_HANDLE_VALUE;

private string _PortName = "COM1";
public string PortName
{
get
{
return _PortName;
}
set
{
_PortName = value;
}
}

private int _BaudRate = 9600;
public int BaudRate
{
get
{
return _BaudRate;
}
set
{
_BaudRate = value;
}
}

#endregion
}
}



OverlappedFunctio.cs


#region Using

using System;
using System.Collections.Generic;
using System.Text;

#endregion

namespace TestAppConsole
{
public enum OverlappedFunction
{
SetHandFlow = 1,
SetQueueSize = 2,
SetTimeOut = 3,
SetFifoControl = 4,
ClearRts = 5,
SetDtr = 6,
SetBaudRate = 7,
SetLineControl = 8,
SetRts = 9,
GetModemStatus = 10,
}
}

[donSalvatore]

No one can help me?

[JonnyPoet]

Hi !
I think one problem of your post is that you are inviting to download an exe file as a 'free serial monitor' so I think nobody of us is willing to download unknown material which is not known to be free of viruses or maybe some spy software. If you want to get help always give material as source code so we can compile it ourselfs.

And who can tell you if this 'free stuff' isn't your problem. Maybe it contains the troubles you have. If we jhave no source we cannot debug it.