private ReadHoldingError ErrorfromBytes(byte[] arr, int size)
{
ReadHoldingError str = new ReadHoldingError();
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(arr, 0, ptr, size);
str = (ReadHoldingError)Marshal.PtrToStructure(ptr, str.GetType());
Marshal.FreeHGlobal(ptr);
return(str);
}
public int ReadHoldingRegister(ReadHoldingRequest requestData)
{
int result = 0;
ReadHoldingResponse responseData = new ReadHoldingResponse();
int responseDataSize = System.Runtime.InteropServices.Marshal.SizeOf(responseData);
byte[] responseByte = new byte[responseDataSize];
byte[] sendByte = new byte[12]; //getBytes(requestData);
int nIndex = 0;
sendByte[nIndex++] = (byte)((requestData.TransactionID & 0xFF00) >> 8);
sendByte[nIndex++] = (byte)(requestData.TransactionID & 0x00FF);
sendByte[nIndex++] = (byte)((requestData.ProtocolID & 0xFF00) >> 8);
sendByte[nIndex++] = (byte)(requestData.ProtocolID & 0x00FF);
sendByte[nIndex++] = (byte)((requestData.Length & 0xFF00) >> 8);
sendByte[nIndex++] = (byte)(requestData.Length & 0x00FF);
sendByte[nIndex++] = requestData.UnitID;
sendByte[nIndex++] = requestData.FunctionCode;
sendByte[nIndex++] = (byte)((requestData.StartAddr & 0xFF00) >> 8);
sendByte[nIndex++] = (byte)(requestData.StartAddr & 0x00FF);
sendByte[nIndex++] = (byte)((requestData.QuantityReg & 0xFF00) >> 8);
sendByte[nIndex++] = (byte)(requestData.QuantityReg & 0x00FF);
_AccuraSocket.Send(sendByte);
SetTransactionID();
int recvCount = _AccuraSocket.Available;
result = _AccuraSocket.Receive(responseByte, responseDataSize, SocketFlags.None);
if (result > 0)
{
responseData = (ReadHoldingResponse)fromBytes(responseByte, Marshal.SizeOf(responseData));
ReadHoldingError errorData = new ReadHoldingError();
errorData = (ReadHoldingError)ErrorfromBytes(responseByte, Marshal.SizeOf(errorData));
if (responseData.TransactionID == _TransactionID - 1 &&
responseData.ProtocolID == 0 &&
responseData.UnitID == 1 &&
responseData.FunctionCode == 3)
{
InitRecvData();
result = _AccuraSocket.Receive(_RecvData, responseData.ByteCount, SocketFlags.None);
}
}
return(result);
}