private ModbusRequest SendWrite(ModbusPackage package, ModbusFunctions functionCode, bool isInternal)
{
ModbusRequest request = null;
if (package.CountVariables > 0)
{
request = new ModbusRequest();
request.IsInternal = isInternal;
request.MBAPHeader.TransactionId = GetTransactionId();
request.MBAPHeader.Length = 0;
request.MBAPHeader.UnitId = UnitId;
request.PDU.FunctionCode = functionCode;
List <byte> pdu = new List <byte>();
pdu.AddRange(BitConverter.GetBytes(Convert.ToUInt16(package.StartRegister)).Reverse());
pdu.AddRange(BitConverter.GetBytes(Convert.ToUInt16(package.CountRegisters)).Reverse());
switch (functionCode)
{
case ModbusFunctions.ForceSingleCoil:
case ModbusFunctions.PresetSingleRegister:
request.MBAPHeader.Length = 6;
break;
case ModbusFunctions.ForceMultipleCoils:
case ModbusFunctions.PresetMultipleRegisters:
pdu.Add(Convert.ToByte(package.SizeInBytes));
pdu.AddRange(package.GetData());
request.MBAPHeader.Length = (ushort)(pdu.Count + 2);
break;
}
request.PDU.Data = pdu.ToArray();
}
return(request);
}
private ModbusRequest SendRead(ModbusPackage package, ModbusFunctions functionCode, bool isInternal)
{
ModbusRequest request = null;
if (package.CountVariables > 0)
{
request = new ModbusRequest();
request.IsInternal = isInternal;
request.MBAPHeader.TransactionId = GetTransactionId();
request.MBAPHeader.Length = 6;
request.MBAPHeader.UnitId = UnitId;
request.PDU.FunctionCode = functionCode;
request.PDU.Data = new byte[4];
ConvertingToBytes(package.StartRegister, request.PDU.Data, 0);
ConvertingToBytes(package.CountRegisters, request.PDU.Data, 2);
}
return(request);
}