public static bool IsPackageCorrect(byte[] package)
{
const int numberBytePosition = 2;
if (package[numberBytePosition] < 20)
{
//ushort calculatedCrc16Value;
//ushort receivedCrc16Value;
byte[] tmpPackage = new byte[package[numberBytePosition]];
for (byte i = 0; i < package[numberBytePosition]; ++i)
{
tmpPackage[i] = package[i + 1];
}
if (CRC16Calculation.ComputeCrc(tmpPackage) ==
GetCRC16FromPackage(package))
{
return(true);
}
//else
// return false;
}
//else
//{
return(false);
//}
}
public static byte[] MakePackage(byte deviceAddress, byte modbusCommand)
{
const byte numberOfBytes = 2;
const byte packageLenght = 5;
byte[] tmpPackage = new byte[numberOfBytes];
byte[] tmpSendPackage = new byte[packageLenght];
tmpPackage[0] = modbusCommand;
tmpPackage[1] = numberOfBytes;
ushort crc16Value = CRC16Calculation.ComputeCrc(tmpPackage);
tmpSendPackage[0] = deviceAddress;
tmpSendPackage[1] = modbusCommand;
tmpSendPackage[2] = numberOfBytes;
tmpSendPackage[3] = Convert.ToByte(crc16Value >> 8);
tmpSendPackage[4] = Convert.ToByte(crc16Value & 0xFF);
return(tmpSendPackage);//
}
public static byte[] MakePackage(byte deviceAddress, byte modbusCommand, byte channel, UInt32 data)
{
const byte numberOfBytes = 8;
const byte packageLenght = 11;
const byte crcLenght = 2;
const UInt32 maxPeriod = 255;
UInt32 overflow;
overflow = data / maxPeriod;
byte[] tmpPackage = new byte[numberOfBytes];
byte[] tmpSendPackage = new byte[packageLenght];
tmpPackage[0] = modbusCommand;
tmpPackage[1] = numberOfBytes;
tmpPackage[2] = channel;
tmpPackage[3] = Convert.ToByte(overflow >> 24);
tmpPackage[4] = Convert.ToByte((overflow >> 16) & 0xFF);
tmpPackage[5] = Convert.ToByte((overflow >> 8) & 0xFF);
tmpPackage[6] = Convert.ToByte(overflow & 0xFF);
tmpPackage[7] = Convert.ToByte(data - overflow * maxPeriod);
ushort crc16Value = CRC16Calculation.ComputeCrc(tmpPackage);
tmpSendPackage[0] = deviceAddress;
for (int i = 1; i < (packageLenght - crcLenght); ++i)
{
tmpSendPackage[i] = tmpPackage[i - 1];
}
tmpSendPackage[9] = Convert.ToByte(crc16Value >> 8);
tmpSendPackage[10] = Convert.ToByte(crc16Value & 0xFF);
return(tmpSendPackage);//
}