public bool ExecFC(byte FC, ModbusDataStruct DataToSend, ref ModbusDataStruct DataReceived)
{
bool ResponseOK = false;
Modbus.ModbusDataStruct Response = new ModbusDataStruct();
byte[] Message = BuildModbusHeader(0, FC, DataToSend.GetAsBytes());
SendBytes(Message);
OnRequestSend(IP, DataToSend);
int ResponseLength = GetResponse(Response);
ResponseOK = CheckModbusHeader(0, FC, Response.GetAsBytes(), ResponseLength);
if (ResponseOK & DataReceived != null)
{
OnRequestReceived(m_RemoteIpEndPoint.Address.ToString(), Response);
RemoveModbusHeader(Response);
switch (FC)
{
case 1:
case 2:
case 3:
case 4:
case 23:
DataReceived.SetAsBytes(Response.GetAsBytes(1,
Response.GetByteCount() - 1), Response.GetByteCount() - 1);//cut off byte length and return only values
break;
default:
DataReceived.SetAsBytes(Response.GetAsBytes(), Response.GetByteCount());
break;
}
}
;
return(ResponseOK);
}
protected int GetRequest(ModbusDataStruct Response)
{
int RecLength = 0;
m_Input.Initialize();
try
{
if (IsConnected())
{
m_Input = m_Client.Receive(ref m_RemoteIpEndPoint); //would block on disconnect!
RecLength = m_Input.Length;
/*IAsyncResult ar = m_Client.BeginReceive(null, null);
* System.Threading.WaitHandle wh = ar.AsyncWaitHandle;
* //because its not possible to set TO, we work async and terminate after some seconds
* if (!ar.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(5000), false))
* {
* m_Input = m_Client.EndReceive(ar, ref m_RemoteIpEndPoint);
* //m_Client.Close();
* //throw new TimeoutException();
* ;
* }
* else
* {
* m_Input = m_Client.EndReceive(ar, ref m_RemoteIpEndPoint);
* RecLength = m_Input.Length;
* }*/
Response.SetAsBytes(m_Input, RecLength);
}
;
}
catch (TimeoutException exception)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NoNetworkConnection);
}
catch (SocketException exception)
{
if (exception.ErrorCode == 10061 | exception.ErrorCode == 10060)
{//10061 "No connection could be made because the target machine actively refused it"
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NoNetworkConnection);
}
else
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NetworkError);
Console.WriteLine(exception.ToString() + " " + exception.ErrorCode.ToString()); //??
}
}
return(RecLength);
}
/// <summary>
/// FC16 Write multiple register
/// FC16-Lengthfields will be added
/// </summary>
/// <param name="Register">= StartRegisterOffset</param>
/// <param name="Data">2*n byte RegisterData</param>
/// <returns></returns>
public bool ExecFC16(UInt16 Register, ModbusDataStruct Data)
{
bool IsOK = false;
Modbus.ModbusDataStruct Request = new ModbusDataStruct();
Request.SetAsBytes(Data.GetAsBytes(), Data.GetByteCount());
byte[] FCLengthFields = new byte[5];
FCLengthFields[0] = (byte)((Register >> 8) & 0xFF);
FCLengthFields[1] = (byte)((Register >> 8));
FCLengthFields[2] = (byte)((Request.GetWordCount() >> 8) & 0xFF);
FCLengthFields[3] = (byte)((Request.GetWordCount()) & 0xFF);
FCLengthFields[4] = (byte)Request.GetByteCount();
//insert Byte and Word count between RegisterAddr and Data
Request.InsertByte(0, FCLengthFields, FCLengthFields.Length);
ModbusDataStruct Answer = new ModbusDataStruct();
IsOK = ExecFC(16, Request, ref Answer);
return(IsOK);
}
protected int GetResponse(ModbusDataStruct Response)
{
int RecLength = 0;
int Timer = 0;
bool RecSomeData = false;
bool NoMoreData = false;
m_Input.Initialize();
try
{
if (IsConnected())
{
//m_Input = m_Client.Receive(ref m_RemoteIpEndPoint); //would block on disconnect!
IAsyncResult ar = m_Client.BeginReceive(null, null);
System.Threading.WaitHandle wh = ar.AsyncWaitHandle;
//because its not possible to set TO, we work async and terminate after some seconds
/*while (!ar.IsCompleted)
* {
* Thread.Sleep(10);
* Timer += 10;
* if (Timer > RequestTO)
* {
* m_Client.Close();
* throw new TimeoutException();
* }
* }*/
if (!ar.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(RequestTO), false))
{
m_Client.Close();
throw new TimeoutException();
}
m_Input = m_Client.EndReceive(ar, ref m_RemoteIpEndPoint);
RecLength = m_Input.Length;
Response.SetAsBytes(m_Input, RecLength);
/*while (Timer < RequestTO && !NoMoreData)
* {
* System.Threading.Thread.Sleep(10);
* Timer = Timer + (10);
* if (m_Stream.DataAvailable)
* {
* RecLength = RecLength + m_Stream.Read(m_Input, RecLength, m_Input.Length);
* RecSomeData = true;
* }
* else
* {
* NoMoreData = RecSomeData; //quit Timeout if some Data was received and no more is following
* }
* };*/
}
;
}
catch (TimeoutException exception)
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NoNetworkConnection);
}
catch (SocketException exception)
{
if (exception.ErrorCode == 10061 | exception.ErrorCode == 10060)
{//10061 "No connection could be made because the target machine actively refused it"
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NoNetworkConnection);
}
else
{
OnMBusException(ModBusException.ModBusExceptionCodeEnum.NetworkError);
Console.WriteLine(exception.ToString() + " " + exception.ErrorCode.ToString()); //??
}
}
finally
{
// wh.Close();
}
return(RecLength);
}