/// <summary>
/// Reads process data from the selected location and device resources.
/// </summary>
/// <param name="pBlock"><see cref="IBlockDescription"/> selecting the resource containing the data block to be read.</param>
/// <param name="pStation">Address of the remote station connected to the common field bus. –1 if not applicable.</param>
/// <param name="pData">The buffer <see cref="IReadValue"/> containing the requested data.</param>
/// <param name="pRetries">Number of retries to get data.</param>
/// <returns>Result of the operation</returns>
public AL_ReadData_Result ReadData(IBlockDescription pBlock, int pStation, out IReadValue pData, byte pRetries)
{
pData = null;
try
{
return(mDataProvider.ReadData(pBlock, pStation, out pData, pRetries));
}
catch (Exception ex)
{
if ((pData != null) && !pData.InPool)
{
pData.ReturnEmptyEnvelope();
}
pData = null;
TraceException(ex, 46);
return(AL_ReadData_Result.ALRes_DatTransferErrr);
}
}
/// <summary>
/// Read Data
/// </summary>
/// <param name="block">Block description to be read</param>
/// <param name="station">Address of the remote station connected to the common field bus. –1 if not applicable.
/// </param>
/// <param name="data">The buffer with the requested data.</param>
/// <param name="retries">Number of retries to get data.</param>
/// <returns>Result of the operation</returns>
AL_ReadData_Result IApplicationLayerMaster.ReadData(IBlockDescription block, int station, out IReadValue data, byte retries)
{
lock (this)
{
InterFrameStopwatch.Reset();
InterFrameStopwatch.Start();
m_rPackNum++;
data = null;
bool TransmissionIsOK = true;
data = (IReadValue)pool.GetEmptyISesDBuffer();
//informacja ze dziala transmitter:
((Message)data).TransmitterON(station);
//Timer.Wait( Timer.TInOneSecond );
((Message)data).SetBlockDescription(station, block);
((Message)data).ReadFromDB();
myStatistic.IncStTxFrameCounter();
myStatistic.IncStRxFrameCounter();
myStatistic.TimeCharGapAdd(1);
myStatistic.TimeMaxResponseDelayAdd(InterFrameStopwatch.ElapsedMilliseconds);
((Message)data).TransmitterOFF(station);
if (m_errorfrequency > 0 && (m_rPackNum % (100 / (ulong)m_errorfrequency)) == 0)
{
TransmissionIsOK = false;
}
if (TransmissionIsOK && ((Message)data).TestCommunication(station))
{
myStatistic.RxDataBlock(true);
return(AL_ReadData_Result.ALRes_Success);
}
else
{
myStatistic.RxDataBlock(false);
data.ReturnEmptyEnvelope();
data = null;
return(AL_ReadData_Result.ALRes_DatTransferErrr);
}
}
}