protected override void EncodeWrite(byte[] request, WriteOperation writeOperation)
{
//uid
request[0] = Convert.ToByte(writeOperation.UnitId);
//Body
//function code
request[m_dataBodyOffset] = writeOperation.FunctionCode;
//address
byte[] address_byte = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)(writeOperation.Address)));
request[this.m_dataBodyOffset + 1] = address_byte[0];
request[this.m_dataBodyOffset + 2] = address_byte[1];
//value
UInt16 value_int = writeOperation.IntValueToWrite;
if (writeOperation.Address == '0' && value_int == 1)
{
request[this.m_dataBodyOffset + 3] = 0xFF;
request[this.m_dataBodyOffset + 4] = 0x00;
}
else
{
byte[] val_byte = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)value_int));
request[this.m_dataBodyOffset + 3] = val_byte[0];
request[this.m_dataBodyOffset + 4] = val_byte[1];
}
if (this.GetCRC(request, 6, out UInt16 crc))
{
byte[] crc_byte = BitConverter.GetBytes(crc);
request[this.m_dataBodyOffset + 5] = crc_byte[0];
request[this.m_dataBodyOffset + 6] = crc_byte[1];
}
}
private async Task WriteCBAsync(WriteOperation operation)
{
byte[] writeRequest = new byte[this.RequestSize];
this.EncodeWrite(writeRequest, operation);
await this.SendRequestAsync(writeRequest).ConfigureAwait(false);
}
public async Task WriteCB(WriteOperation operation)
{
byte[] writeRequest = new byte[m_bufSize];
byte[] writeResponse = null;
int reqLen = this.m_reqSize;
this.EncodeWrite(writeRequest, operation);
writeResponse = await this.SendRequest(writeRequest, reqLen);
}
protected override void EncodeWrite(byte[] request, WriteOperation writeOperation)
{
//MBAP
//transaction id 2 bytes
request[0] = 0;
request[1] = 0;
//protocol id 2 bytes
request[2] = 0;
request[3] = 0;
//length
const int requestLength = 6;
byte[] requestLengthBytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)requestLength));
request[4] = requestLengthBytes[0];
request[5] = requestLengthBytes[1];
//uid
request[6] = Convert.ToByte(writeOperation.UnitId);
//Body
//function code
request[this.FunctionCodeOffset] = (byte)writeOperation.FunctionCode;
//address
byte[] addressBytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)(writeOperation.Address)));
request[this.FunctionCodeOffset + 1] = addressBytes[0];
request[this.FunctionCodeOffset + 2] = addressBytes[1];
//value
UInt16 valueToWrite = writeOperation.IntValueToWrite;
if (writeOperation.Entity == '0' && valueToWrite == 1)
{
request[this.FunctionCodeOffset + 3] = 0xFF;
request[this.FunctionCodeOffset + 4] = 0x00;
}
else
{
byte[] valueBytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)valueToWrite));
request[this.FunctionCodeOffset + 3] = valueBytes[0];
request[this.FunctionCodeOffset + 4] = valueBytes[1];
}
}
protected override void EncodeWrite(byte[] request, WriteOperation writeOperation)
{
//MBAP
//transaction id 2 bytes
request[0] = 0;
request[1] = 0;
//protocol id 2 bytes
request[2] = 0;
request[3] = 0;
//length
byte[] len_byte = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)6));
request[4] = len_byte[0];
request[5] = len_byte[1];
//uid
request[6] = Convert.ToByte(writeOperation.UnitId);
//Body
//function code
request[m_dataBodyOffset] = writeOperation.FunctionCode;
//address
byte[] address_byte = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)(writeOperation.Address)));
request[this.m_dataBodyOffset + 1] = address_byte[0];
request[this.m_dataBodyOffset + 2] = address_byte[1];
//value
UInt16 value_int = writeOperation.IntValueToWrite;
if (writeOperation.Entity == '0' && value_int == 1)
{
request[this.m_dataBodyOffset + 3] = 0xFF;
request[this.m_dataBodyOffset + 4] = 0x00;
}
else
{
byte[] val_byte = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((Int16)value_int));
request[this.m_dataBodyOffset + 3] = val_byte[0];
request[this.m_dataBodyOffset + 4] = val_byte[1];
}
}
public async Task WriteMessage(WriteOperation operation)
{
if (operation.ValueType != ModbusValueType.Basic)
{
//Handling complex value
//Obtain value split into several int values
var valuesToBeWritten = ModbusComplexValuesHandler.SplitComplexValue(operation.Value, operation.ValueType);
//We need to write each part of complex value to separate registry
foreach (var v in valuesToBeWritten)
{
operation.IntValueToWrite = Convert.ToUInt16(operation.Value);
await WriteCB(operation);
operation.StartAddress = (Convert.ToInt32(operation.StartAddress) + 1).ToString();
}
}
else
{
operation.IntValueToWrite = Convert.ToUInt16(operation.Value);
await WriteCB(operation);
}
}
protected abstract void EncodeWrite(byte[] writeRequest, WriteOperation readOperation);
