private void AddToReadPending(ModBusReadRequest req)
{
_seqNum++;
if (_seqNum == 0)
{
_seqNum++;
}
req.SeqNum = _seqNum;
PendingReadRequestList.Add(req);
if (PendingReadRequestList.Count > _maxSendCapacity)
{
PendingReadRequestList.RemoveAt(0);
}
}
public Result ReadInputRegisters(ModBusReadRequest req)
{
if (HardwareInterface.PacketsInSendingList > _maxSendCapacity)
{
return(Result.FullBuffer);
}
if (Mode == ModBusMode.RTU)
{
AddToReadPending(req);
byte[] message = RtuMakeFunction4(req, ModbusFunctions.ReadInputRegisters);
return(HardwareInterface.SendOverSerialPort(Port, _seqNum, message));
}
return(Result.NotImplemented);
}
private byte[] RtuMakeFunction4(ModBusReadRequest req, ModbusFunctions function)
{
var message = new byte[8];
message[0] = (byte)req.SlaveAddress;
message[1] = (byte)function;
message[2] = (byte)(req.StartAddress >> 8);
message[3] = (byte)req.StartAddress;
message[4] = (byte)(req.NumberOfPoints >> 8);
message[5] = (byte)req.NumberOfPoints;
var crc16 = ModbusUtility.ComputeCRC16(message, 0, message.Length - 2);
message[message.Length - 2] = crc16[0];
message[message.Length - 1] = crc16[1];
return(message);
}
private bool HardwareInterface_OnReceiceNewPacket(object sender, Packet packet)
{
if (packet.Data == null || packet.Data.Length < 7)
{
return(false);
}
if (packet.Data[0] == ':' && packet.Data[packet.Data.Length - 2] == 0x0D && packet.Data[packet.Data.Length - 1] == 0x0A)
{
//res.Mode = ModBusMode.ASCII;
}
else
{
ModbusFunctions function = (ModbusFunctions)packet.Data[1];
ModBusReadRequest req = null;
if (function == ModbusFunctions.ReadCoils || function == ModbusFunctions.ReadHoldingRegisters ||
function == ModbusFunctions.ReadInputRegisters || function == ModbusFunctions.ReadInputs)
{
for (int i = 0; i < PendingReadRequestList.Count; i++)
{
ModBusReadRequest pr = PendingReadRequestList.GetAt(i);
if (packet.SeqNum == pr.SeqNum)
{
req = pr;
PendingReadRequestList.RemoveAt(i);
break;
}
}
if (req == null)
{
return(false);
}
}
if (function == ModbusFunctions.ReadCoils)
{
var res = new ModBusReadCoilResponse()
{
Mode = ModBusMode.RTU,
SlaveAddress = packet.Data[0],
Function = function,
ByteCount = packet.Data[2],
StartAddress = req.StartAddress,
};
res.Data = new byte[res.ByteCount];
for (int i = 0; i < res.ByteCount; i++)
{
res.Data[i] = packet.Data[i + 3];
}
var crc16 = ModbusUtility.ComputeCRC16(packet.Data, 0, packet.Data.Length - 2);
if (crc16[0] == packet.Data[packet.Data.Length - 2] && crc16[1] == packet.Data[packet.Data.Length - 1])
{
OnReceiveNewResponse?.Invoke(this, function, res);
}
}
else if (function == ModbusFunctions.ReadInputs)
{
var res = new ModBusReadInputResponse()
{
Mode = ModBusMode.RTU,
SlaveAddress = packet.Data[0],
Function = function,
ByteCount = packet.Data[2],
StartAddress = req.StartAddress,
};
res.Data = new byte[res.ByteCount];
for (int i = 0; i < res.ByteCount; i++)
{
res.Data[i] = packet.Data[i + 3];
}
var crc16 = ModbusUtility.ComputeCRC16(packet.Data, 0, packet.Data.Length - 2);
if (crc16[0] == packet.Data[packet.Data.Length - 2] && crc16[1] == packet.Data[packet.Data.Length - 1])
{
OnReceiveNewResponse?.Invoke(this, function, res);
}
}
else if (function == ModbusFunctions.ReadHoldingRegisters)
{
var res = new ModBusReadHoldingRegisterResponse()
{
Mode = ModBusMode.RTU,
SlaveAddress = packet.Data[0],
Function = function,
ByteCount = packet.Data[2],
StartAddress = req.StartAddress,
};
res.Data = new ushort[res.ByteCount / 2];
int n = 0;
for (int i = 0; i < res.ByteCount; i += 2)
{
res.Data[n++] = (ushort)((packet.Data[i + 3] << 8) | (packet.Data[i + 4]));
}
var crc16 = ModbusUtility.ComputeCRC16(packet.Data, 0, packet.Data.Length - 2);
if (crc16[0] == packet.Data[packet.Data.Length - 2] && crc16[1] == packet.Data[packet.Data.Length - 1])
{
OnReceiveNewResponse?.Invoke(this, function, res);
}
}
else if (function == ModbusFunctions.ReadInputs)
{
var res = new ModBusReadInputRegisterResponse()
{
Mode = ModBusMode.RTU,
SlaveAddress = packet.Data[0],
Function = function,
ByteCount = packet.Data[2],
StartAddress = req.StartAddress,
};
res.Data = new ushort[res.ByteCount / 2];
int n = 0;
for (int i = 0; i < res.ByteCount; i += 2)
{
res.Data[n++] = (ushort)((packet.Data[i + 3] << 8) | (packet.Data[i + 4]));
}
var crc16 = ModbusUtility.ComputeCRC16(packet.Data, 0, packet.Data.Length - 2);
if (crc16[0] == packet.Data[packet.Data.Length - 2] && crc16[1] == packet.Data[packet.Data.Length - 1])
{
OnReceiveNewResponse?.Invoke(this, function, res);
}
}
else if (function == ModbusFunctions.WriteSingleCoil || function == ModbusFunctions.WriteSingleRegister)
{
var res = new ModBusWriteSingleResponse()
{
Mode = ModBusMode.RTU,
SlaveAddress = packet.Data[0],
Function = function,
};
res.Address = (ushort)((packet.Data[2] << 8) | (packet.Data[3]));
res.Value = (ushort)((packet.Data[4] << 8) | (packet.Data[4]));
var crc16 = ModbusUtility.ComputeCRC16(packet.Data, 0, packet.Data.Length - 2);
if (crc16[0] == packet.Data[packet.Data.Length - 2] && crc16[1] == packet.Data[packet.Data.Length - 1])
{
OnReceiveNewResponse?.Invoke(this, function, res);
}
}
}
return(true);
}