/// <summary>
/// This Task handles all the types of Modbus Functions
/// </summary>
/// <returns>The operation.</returns>
/// <param name="functionType">Function type.</param>
/// <param name="slaveAddress">Slave address.</param>
/// <param name="nrRegisters">Nr registers.</param>
/// <param name="selectedRegisterAddress">Selected register address.</param>
/// <param name="dataToWrite">Data to write.</param>
public async Task <ReceivedData> ModbusOperation(ModbusFunctionType functionType, byte slaveAddress, byte[] nrRegisters, byte[] selectedRegisterAddress, byte[] dataToWrite)
{
frameToSend = new ModbusFrame();
if (functionType == ModbusFunctionType.WriteCoil || functionType == ModbusFunctionType.WriteHoldingRegister)
{
frameToSend = new ModbusFrame(slaveAddress, functionType, selectedRegisterAddress, null, dataToWrite);
}
else
{
frameToSend = new ModbusFrame(slaveAddress, functionType, selectedRegisterAddress, nrRegisters, null);
}
//We send the message to the Slave Device
TransmissionState b = await SendMessage(frameToSend.BytePacketToSend);
sizeOfMessage = CalculateExpectedSize();
ReceivedData responseData = new ReceivedData();
//If the message was transmitted right, then proceed with the listening
//of the response
if (b == TransmissionState.OK)
{
System.Diagnostics.Debug.WriteLine("MessageSended: " + b.ToString());
//TO-DO Implement the retry mechanism
//int retries = 3;
//responseData = await ListenMessages();
responseData = await ListenMessages();
}
else
{
responseData.state = TransmissionState.ErrorSendMessage;
}
if (responseData.state == TransmissionState.OK)
{
frameReceived = new ModbusFrame(responseData.data);
}
else
{
frameReceived = new ModbusFrame();
}
return(responseData);
}
/// <summary>
/// Initializes a new instance of the ModbusFrame class
/// based on the informations given in input by the user.
/// It can be used to the Request to Read or Write
/// </summary>
/// <param name="slaveAddress">Slave address.</param>
/// <param name="ft">Ft.</param>
/// <param name="registerAddr">Register address.</param>
/// <param name="nrRegisters">Nr registers.</param>
/// <param name="dataToWrite">Data to write.</param>
/// <param name="request">If set to <c>true</c> request.</param>
public ModbusFrame(byte slaveAddress, ModbusFunctionType ft, byte[] registerAddr, byte[] nrRegisters, byte[] dataToWrite, bool request = true)
{
this.SlaveAddress = slaveAddress;
this.FunctionType = ft;
this.FunctionCode = functionCodesRequests[ft];
this.RegisterAddress = registerAddr;
this.NumberOfRegisters = nrRegisters;
this.DataToWrite = dataToWrite;
this.IsRequestFrame = request;
this.PacketInBytes = BuildBytesFrame();
this.CRC = ModRTU_CRC();
this.BuildPacketToSend();
this.SetFrameType();
this.State = ModbusFrameState.Correct;
}