private void Deserialize(byte[] bytes)
{
var buffer = new DataBuffer(bytes);
DeviceId = buffer.GetByte(0);
Function = (FunctionCode)buffer.GetByte(1);
byte[] crcBuff = buffer.GetBytes(buffer.Length - 3, 2);
byte[] crcCalc = Checksum.CRC16(bytes, 0, bytes.Length - 2);
if (crcBuff[0] != crcCalc[0] || crcBuff[1] != crcCalc[1])
{
throw new InvalidOperationException("Data not valid (CRC check failed).");
}
switch (Function)
{
case FunctionCode.ReadCoils:
case FunctionCode.ReadDiscreteInputs:
case FunctionCode.ReadHoldingRegisters:
case FunctionCode.ReadInputRegisters:
Address = buffer.GetUInt16(2);
Count = buffer.GetUInt16(4);
break;
case FunctionCode.WriteMultipleCoils:
case FunctionCode.WriteMultipleRegisters:
Address = buffer.GetUInt16(2);
Count = buffer.GetUInt16(4);
Data = new DataBuffer(buffer.GetBytes(6, buffer.Length - 8));
break;
case FunctionCode.WriteSingleCoil:
case FunctionCode.WriteSingleRegister:
Address = buffer.GetUInt16(2);
Data = new DataBuffer(buffer.GetBytes(4, buffer.Length - 6));
break;
case FunctionCode.EncapsulatedInterface:
MEIType = (MEIType)buffer.GetByte(8);
switch (MEIType)
{
case MEIType.CANOpenGeneralReference:
Data = new DataBuffer(buffer.Buffer.Skip(9).ToArray());
break;
case MEIType.ReadDeviceInformation:
MEICategory = (DeviceIDCategory)buffer.GetByte(9);
MEIObject = (DeviceIDObject)buffer.GetByte(10);
break;
default:
throw new NotImplementedException($"Unknown MEI type: {MEIType}");
}
break;
default:
throw new NotImplementedException($"Unknown function code: {Function}");
}
}
internal bool TestCommunicationCircuit()
{
if (!Port.IsOpen)
{
return(false);
}
lock (synLocker)
{
byte[] data = new byte[8];
data[0] = addr;
data[1] = 0x08;
data[2] = 0x00;
data[3] = 0x00;
data[4] = 0x17;
data[5] = 0x70;
byte[] crc = Checksum.CRC16(data, 6);
data[6] = crc[0];
data[7] = crc[1];
if (InitTransArgs(8))
{
Port.Write(data, 0, 8);
if (WaitForResponse(1000))
{
byte[] recvData = new byte[8];
Port.Read(recvData, 0, 8);
return(recvData[1] == 0x08);
}
}
return(false);
}
}
internal bool WriteOneRegisterValue(ushort address, ushort value)
{
if (!Port.IsOpen)
{
return(false);
}
lock (synLocker)
{
byte[] data = new byte[8];
data[0] = addr;
data[1] = 0x06;
data[2] = (byte)(address >> 8 & 0xFF);
data[3] = (byte)(address & 0xFF);
data[4] = (byte)(value >> 8 & 0xFF);
data[5] = (byte)(value & 0xFF);
byte[] crc = Checksum.CRC16(data, 6);
data[6] = crc[0];
data[7] = crc[1];
if (InitTransArgs(8))
{
Port.Write(data, 0, 8);
if (WaitForResponse(2000))
{
byte[] recvData = new byte[8];
Port.Read(recvData, 0, 8);
return(BitConverter.ToUInt64(recvData, 0) == BitConverter.ToUInt64(data, 0));
}
}
return(false);
}
}
internal bool ReadRegisterValues(ushort address, out ushort[] value, int num = 1)
{
if (num > 20)
{
num = 20;
}
value = new ushort[num];
if (!Port.IsOpen)
{
return(false);
}
lock (synLocker)
{
byte[] data = new byte[8];
data[0] = addr;
data[1] = 0x03;
data[2] = (byte)(address >> 8 & 0xFF);
data[3] = (byte)(address & 0xFF);
data[4] = (byte)(num >> 8 & 0xFF);
data[5] = (byte)(num & 0xFF);
byte[] crc = Checksum.CRC16(data, 6);
data[6] = crc[0];
data[7] = crc[1];
waitFlag = true;
if (InitTransArgs(5 + num * 2))
{
Port.Write(data, 0, 8);
if (WaitForResponse(500 * num))
{
byte[] recvData = new byte[readBufferNum];
Port.Read(recvData, 0, readBufferNum);
if (recvData[2] == 2 * num)
{
for (int i = 0; i < num; i++)
{
value[i] = recvData[3 + i * 2];
value[i] <<= 8;
value[i] += recvData[4 + i * 2];
}
return(true);
}
}
}
return(false);
}
}
internal bool WriteMultipleRegisterValues(ushort address, ushort[] value, int num)
{
if (!Port.IsOpen)
{
return(false);
}
if (value.Length < num)
{
num = value.Length;
}
lock (synLocker)
{
byte[] data = new byte[9 + num * 2];
data[0] = addr;
data[1] = 0x10;
data[2] = (byte)(address >> 8 & 0xFF);
data[3] = (byte)(address & 0xFF);
data[4] = 0x00;
data[5] = (byte)(num);
data[6] = (byte)(data[5] * 2);
for (int i = 0; i < data[6]; i += 2)
{
data[7 + i] = (byte)(value[i / 2] >> 8 & 0xFF);
data[8 + i] = (byte)(value[i / 2] & 0xFF);
}
byte[] crc = Checksum.CRC16(data, 7 + num * 2);
data[7 + num * 2] = crc[0];
data[8 + num * 2] = crc[1];
if (InitTransArgs(8))
{
Port.Write(data, 0, data.Length);
if (WaitForResponse(2000))
{
byte[] recvData = new byte[8];
Port.Read(recvData, 0, 8);
return(BitConverter.ToUInt32(data, 2) == BitConverter.ToUInt32(recvData, 2));
}
}
return(false);
}
}
/// <summary>
/// Serializes the request ready to send via serial.
/// </summary>
/// <returns></returns>
public byte[] Serialize()
{
var buffer = new DataBuffer(2);
buffer.SetByte(0, DeviceId);
buffer.SetByte(1, (byte)Function);
switch (Function)
{
case FunctionCode.ReadCoils:
case FunctionCode.ReadDiscreteInputs:
case FunctionCode.ReadHoldingRegisters:
case FunctionCode.ReadInputRegisters:
buffer.AddUInt16(Address);
buffer.AddUInt16(Count);
break;
case FunctionCode.WriteMultipleCoils:
case FunctionCode.WriteMultipleRegisters:
buffer.AddUInt16(Address);
buffer.AddUInt16(Count);
if (Data?.Length > 0)
{
buffer.AddBytes(Data.Buffer);
}
break;
case FunctionCode.WriteSingleCoil:
case FunctionCode.WriteSingleRegister:
buffer.AddUInt16(Address);
if (Data?.Length > 0)
{
buffer.AddBytes(Data.Buffer);
}
break;
case FunctionCode.EncapsulatedInterface:
buffer.AddByte((byte)MEIType);
switch (MEIType)
{
case MEIType.CANOpenGeneralReference:
if (Data?.Length > 0)
{
buffer.AddBytes(Data.Buffer);
}
break;
case MEIType.ReadDeviceInformation:
buffer.AddByte((byte)MEICategory);
buffer.AddByte((byte)MEIObject);
break;
default:
throw new NotImplementedException();
}
break;
default:
throw new NotImplementedException();
}
byte[] crc = Checksum.CRC16(buffer.Buffer);
buffer.AddBytes(crc);
return(buffer.Buffer);
}
private void Deserialize(byte[] bytes)
{
// Response timed out => device not available
if (bytes.All(b => b == 0))
{
IsTimeout = true;
return;
}
var buffer = new DataBuffer(bytes);
var crcBuff = buffer.GetBytes(buffer.Length - 2, 2);
var crcCalc = Checksum.CRC16(bytes, 0, bytes.Length - 2);
if (crcBuff[0] != crcCalc[0] || crcBuff[1] != crcCalc[1])
{
throw new InvalidOperationException("Data not valid (CRC check failed).");
}
DeviceId = buffer.GetByte(0);
var fn = buffer.GetByte(1);
if ((fn & Consts.ErrorMask) > 0)
{
Function = (FunctionCode)(fn ^ Consts.ErrorMask);
ErrorCode = (ErrorCode)buffer.GetByte(2);
}
else
{
Function = (FunctionCode)fn;
switch (Function)
{
case FunctionCode.ReadCoils:
case FunctionCode.ReadDiscreteInputs:
case FunctionCode.ReadHoldingRegisters:
case FunctionCode.ReadInputRegisters:
var len = buffer.GetByte(2);
if (buffer.Length != len + 3 + 2) // following bytes + 3 byte head + 2 byte CRC
{
throw new ArgumentException("Response incomplete");
}
Data = new DataBuffer(buffer.GetBytes(3, buffer.Length - 5));
break;
case FunctionCode.WriteMultipleCoils:
case FunctionCode.WriteMultipleRegisters:
Address = buffer.GetUInt16(2);
Count = buffer.GetUInt16(4);
break;
case FunctionCode.WriteSingleCoil:
case FunctionCode.WriteSingleRegister:
Address = buffer.GetUInt16(2);
Data = new DataBuffer(buffer.GetBytes(4, buffer.Length - 6));
break;
case FunctionCode.EncapsulatedInterface:
MEIType = (MEIType)buffer.GetByte(2);
switch (MEIType)
{
case MEIType.CANOpenGeneralReference:
Data = new DataBuffer(buffer.Buffer.Skip(3).ToArray());
break;
case MEIType.ReadDeviceInformation:
MEICategory = (DeviceIDCategory)buffer.GetByte(3);
ConformityLevel = buffer.GetByte(4);
MoreRequestsNeeded = buffer.GetByte(5) > 0;
NextObjectId = buffer.GetByte(6);
ObjectCount = buffer.GetByte(7);
Data = new DataBuffer(buffer.Buffer.Skip(8).ToArray());
break;
default:
throw new NotImplementedException();
}
break;
default:
throw new NotImplementedException();
}
}
}
internal byte[] Serialize()
{
var buffer = new DataBuffer(2);
buffer.SetByte(0, DeviceId);
var fn = (byte)Function;
if (IsError)
{
fn = (byte)(fn & Consts.ErrorMask);
buffer.AddByte((byte)ErrorCode);
}
else
{
switch (Function)
{
case FunctionCode.ReadCoils:
case FunctionCode.ReadDiscreteInputs:
case FunctionCode.ReadHoldingRegisters:
case FunctionCode.ReadInputRegisters:
buffer.AddByte((byte)Data.Length);
buffer.AddBytes(Data.Buffer);
break;
case FunctionCode.WriteMultipleCoils:
case FunctionCode.WriteMultipleRegisters:
buffer.AddUInt16(Address);
buffer.AddUInt16(Count);
break;
case FunctionCode.WriteSingleCoil:
case FunctionCode.WriteSingleRegister:
buffer.AddUInt16(Address);
buffer.AddBytes(Data.Buffer);
break;
case FunctionCode.EncapsulatedInterface:
buffer.AddByte((byte)MEIType);
switch (MEIType)
{
case MEIType.CANOpenGeneralReference:
if (Data?.Length > 0)
{
buffer.AddBytes(Data.Buffer);
}
break;
case MEIType.ReadDeviceInformation:
buffer.AddByte((byte)MEICategory);
buffer.AddByte(ConformityLevel);
buffer.AddByte((byte)(MoreRequestsNeeded ? 0xFF : 0x00));
buffer.AddByte(NextObjectId);
buffer.AddByte(ObjectCount);
buffer.AddBytes(Data.Buffer);
break;
default:
throw new NotImplementedException();
}
break;
default:
throw new NotImplementedException();
}
}
buffer.SetByte(1, fn);
var crc = Checksum.CRC16(buffer.Buffer);
buffer.AddBytes(crc);
return(buffer.Buffer);
}