public ushort[] ReadData(int DglbId, uint size)
{
BPModbusDecoder decoder = new BPModbusDecoder(null, DglbId, (int)DevMgmtS_dcte.mgmt_cmd.DGLB_RD_FIRST);
try
{
return modbus.ReadHoldingRegisters((byte)slaveAddress, (ushort)decoder.address, (ushort)(size / 2));
}
catch (TimeoutException e)
{
throw new CommunicationException("Timeout has occured", e);
}
catch (InvalidOperationException e)
{
throw new CommunicationException("Serial port is not opened", e);
}
catch (SlaveException e)
{
//This encodes exceptions to modbus unspeciffic format
switch (e.SlaveExceptionCode)
{
case 0x01:
throw new CommunicationException("Read not supported", new InvalidOperationException());
case 0x02:
throw new CommunicationException("Illegal data address, are we really talking to end device?", new AmbigousDeviceException());
case 0x04:
//We assume that if slave device has a failure, it is unavalible.
throw new CommunicationException("Slave device failure", new DeviceUnavalibleException());
}
}
catch (Exception e)
{
throw new CommunicationException("Unknown communication exception", e);
}
return null;
}
public void ReadRecord(int DglbId, DataRow data)
{
DataRowSerializer serializer = new DataRowSerializer(data.Table);
uint readCount;
//Code for reading record
try
{
readCount = serializer.GetSerializedDataLength();
}
catch (SerializerException e)
{
throw new CommunicationException("Problems with getting length of serialized data", e);
}
//Here we read record
UInt16[] receivedData = new UInt16[readCount / 2];
BPModbusDecoder decoder = new BPModbusDecoder(receivedData, DglbId, (int)DevMgmtS_dcte.mgmt_cmd.DGLB_RD_FIRST);
decoder._data = ReadData(DglbId, readCount);
//Here we deserialize record
try
{
serializer.DeserializeData(decoder.data, data);
}
catch (SerializerException e)
{
throw new CommunicationException("Problems with deserialization", e);
}
}
public object ReadRecord(int DglbId, Type type)
{
BinarySerializer serializer = new BinarySerializer(new Type[] { type });
uint readCount;
//Code for reading record
try
{
readCount = serializer.GetSerializedDataLength();
}
catch (SerializerException e)
{
throw new CommunicationException("Problems with getting length of serialized data", e);
}
//Here we read record
UInt16[] receivedData = new UInt16[readCount / 2];
BPModbusDecoder decoder = new BPModbusDecoder(receivedData, DglbId, (int)DevMgmtS_dcte.mgmt_cmd.DGLB_RD_FIRST);
decoder._data = ReadData(DglbId, readCount);
//Here we deserialize record
try
{
return serializer.DeserializeData(decoder.data)[0];
}
catch (SerializerException e)
{
throw new CommunicationException("Problems with deserialization", e);
}
}
