/// <summary>
/// Sends a Diagnostics (0x08) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="subFunction">Sub function code.</param>
/// <param name="data">Data</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <returns>Returns a unsigned short array with diagnostic data.</returns>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual ushort[] Diagnostics(byte deviceAddress, ushort subFunction, ushort[] data, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.Diagnostics, (short)(2 + 2 * data.Length),
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, subFunction);
for (int n = 0; n < data.Length; ++n)
{
ModbusUtils.InsertUShort(_Buffer, dataPos + 2 + 2 * n, data[n]);
}
var dataLength = SendReceive(deviceAddress, ModbusFunctionCode.Diagnostics, timeout, telegramLength, (short)(2 + 2 * data.Length), telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
data = new ushort[(dataLength - 2) / 2];
for (int n = 0; n < data.Length; ++n)
{
data[n] = ModbusUtils.ExtractUShort(_Buffer, dataPos + 2 + 2 * n);
}
return(data);
}
/// <summary>
/// Sends a Read Write Multiple Coils (0x17) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="writeStartAddress">Address of the 1st write register: 0x0000 .. 0xFFFF</param>
/// <param name="writeRegisters">Register values to write</param>
/// <param name="readStartAddress">Address of the 1st read register: 0x0000 .. 0xFFFF</param>
/// <param name="readCount">Number of registers to read</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <returns>Returns a unsigned short array with the register values.</returns>
/// <remarks>
/// The write operation is performed before the read operation.
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual ushort[] ReadWriteMultipleRegisters(byte deviceAddress, ushort writeStartAddress, ushort[] writeRegisters, ushort readStartAddress, ushort readCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.ReadWriteMultipleRegisters, (short)(9 + 2 * writeRegisters.Length),
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, readStartAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, readCount);
ModbusUtils.InsertUShort(_Buffer, dataPos + 4, writeStartAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 6, (ushort)writeRegisters.Length);
_Buffer[dataPos + 8] = (byte)(2 * writeRegisters.Length);
for (int i = 0; i < writeRegisters.Length; i++)
{
ModbusUtils.InsertUShort(_Buffer, dataPos + 9 + 2 * i, writeRegisters[i]);
}
SendReceive(deviceAddress, ModbusFunctionCode.ReadWriteMultipleRegisters, timeout, telegramLength, (short)(1 + 2 * readCount), telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
var readRegisters = new ushort[readCount];
for (int n = 0; n < readRegisters.Length; ++n)
{
readRegisters[n] = ModbusUtils.ExtractUShort(_Buffer, dataPos + 1 + 2 * n);
}
return(readRegisters);
}
/// <summary>
/// Sends a Read Input Registers (0x04) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Start address: 0x0000 .. 0xFFFF</param>
/// <param name="registerCount">Number of the registers to read.</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <returns>Returns an array of 16 bit register values.</returns>
/// <remarks>
/// A register is a 16 bit unsigned value.
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual ushort[] ReadInputRegisters(byte deviceAddress, ushort startAddress, ushort registerCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.ReadInputRegisters, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, registerCount);
short desiredDataLength = (short)(1 + 2 * registerCount);
var dataLength = SendReceive(deviceAddress, ModbusFunctionCode.ReadInputRegisters, timeout, telegramLength, desiredDataLength, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
var registers = new ushort[(dataLength - 1) / 2];
for (int n = 0; n < registers.Length; ++n)
{
registers[n] = ModbusUtils.ExtractUShort(_Buffer, dataPos + 1 + 2 * n);
}
return(registers);
}
private void ReadInputRegisters(IModbusInterface intf, bool isBroadcast, object telegramContext, ModbusFunctionCode fc, short dataPos, short dataLength)
{
if (dataLength < 4)
{
SendErrorResult(intf, isBroadcast, _deviceAddress, telegramContext, fc, ModbusErrorCode.IllegalDataValue);
}
else
{
ushort startAddress = ModbusUtils.ExtractUShort(_buffer, dataPos);
ushort registerCount = ModbusUtils.ExtractUShort(_buffer, dataPos + 2);
ushort[] registers = new ushort[registerCount];
var err = OnReadInputRegisters(isBroadcast, startAddress, registers);
if (isBroadcast)
{
return;
}
if (err != ModbusErrorCode.NoError)
{
SendErrorResult(intf, false, _deviceAddress, telegramContext, fc, err);
}
else
{
short telegramLength;
intf.CreateTelegram(_deviceAddress, (byte)fc, (short)(1 + 2 * registers.Length), _buffer, out telegramLength, out dataPos, true, ref telegramContext);
_buffer[dataPos] = (byte)(2 * registers.Length);
for (int i = 0; i < registerCount; i++)
{
ModbusUtils.InsertUShort(_buffer, dataPos + 1 + 2 * i, registers[i]);
}
intf.SendTelegram(_buffer, telegramLength);
}
}
}
private void WriteSingleRegister(IModbusInterface intf, bool isBroadcast, object telegramContext, ModbusFunctionCode fc, short dataPos, short dataLength)
{
if (dataLength < 4)
{
SendErrorResult(intf, isBroadcast, _deviceAddress, telegramContext, fc, ModbusErrorCode.IllegalDataValue);
}
else
{
ushort address = ModbusUtils.ExtractUShort(_buffer, dataPos);
ushort value = ModbusUtils.ExtractUShort(_buffer, dataPos + 2);
var err = OnWriteSingleRegister(isBroadcast, address, value);
if (isBroadcast)
{
return;
}
if (err != ModbusErrorCode.NoError)
{
SendErrorResult(intf, false, _deviceAddress, telegramContext, fc, err);
}
else
{
short telegramLength;
intf.CreateTelegram(_deviceAddress, (byte)fc, 4, _buffer, out telegramLength, out dataPos, true, ref telegramContext);
ModbusUtils.InsertUShort(_buffer, dataPos, address);
ModbusUtils.InsertUShort(_buffer, dataPos + 2, value);
intf.SendTelegram(_buffer, telegramLength);
}
}
}
/// <summary>
/// Sends a Read Discrete Inputs (0x02) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Start address: 0x0000 .. 0xFFFF</param>
/// <param name="inputCount">>Number of coils to read: 1 .. 2000</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <returns>Returns a byte array which contains the inputs. The inputs are written as single bits into the array starting with coil 1 at the lsb.</returns>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual byte[] ReadDiscreteInputs(byte deviceAddress, ushort startAddress, ushort inputCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.ReadDiscreteInputs, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, inputCount);
short desiredDataLength = (short)(1 + inputCount / 8);
if (inputCount % 8 != 0)
{
++desiredDataLength;
}
var dataLength = SendReceive(deviceAddress, ModbusFunctionCode.ReadDiscreteInputs, timeout, telegramLength, desiredDataLength, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
var coils = new byte[dataLength - 1];
Array.Copy(_Buffer, dataPos + 1, coils, 0, dataLength - 1);
return(coils);
}
private void WriteMultipleCoils(IModbusInterface intf, bool isBroadcast, object telegramContext, ModbusFunctionCode fc, short dataPos, short dataLength)
{
if (dataLength < 5)
{
SendErrorResult(intf, isBroadcast, _deviceAddress, telegramContext, fc, ModbusErrorCode.IllegalDataValue);
}
else
{
ushort startAddress = ModbusUtils.ExtractUShort(_buffer, dataPos);
ushort outputCount = ModbusUtils.ExtractUShort(_buffer, dataPos + 2);
byte byteCount = _buffer[dataPos + 4];
byte[] values = new byte[byteCount];
Array.Copy(_buffer, dataPos + 5, values, 0, values.Length);
var err = OnWriteMultipleCoils(isBroadcast, startAddress, outputCount, values);
if (isBroadcast)
{
return;
}
if (err != ModbusErrorCode.NoError)
{
SendErrorResult(intf, false, _deviceAddress, telegramContext, fc, err);
}
else
{
short telegramLength;
intf.CreateTelegram(_deviceAddress, (byte)fc, 4, _buffer, out telegramLength, out dataPos, true, ref telegramContext);
ModbusUtils.InsertUShort(_buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_buffer, dataPos + 2, outputCount);
intf.SendTelegram(_buffer, telegramLength);
}
}
}
/// <summary>
/// Sends a Write Multiple Coils (0x10) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Address of the 1st register: 0x0000 .. 0xFFFF</param>
/// <param name="registers">Register values to write</param>
/// <param name="offset">Offset in register of the 1st register to write</param>
/// <param name="count">Number of registers to write</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void WriteMultipleRegisters(byte deviceAddress, ushort startAddress, ushort[] registers, int offset, int count, int timeout = 2000)
{
if (offset < 0 || offset >= registers.Length)
{
throw new ArgumentException("offset");
}
if (offset + count > registers.Length)
{
throw new ArgumentException("count");
}
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.WriteMultipleRegisters, (short)(5 + 2 * count),
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, (ushort)count);
_Buffer[dataPos + 4] = (byte)(2 * count);
for (int i = 0; i < count; i++)
{
ModbusUtils.InsertUShort(_Buffer, dataPos + 5 + 2 * i, registers[offset + i]);
}
SendReceive(deviceAddress, ModbusFunctionCode.WriteMultipleRegisters, timeout, telegramLength, 4, telegramContext, ref dataPos);
}
/// <summary>
/// Sends a Get Comm Event Log (0x0C) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="status">Receives the status word of the device.</param>
/// <param name="eventCount">Receives the event counter of the device.</param>
/// <param name="messageCount">Receives the event message count.</param>
/// <param name="events">Receives 0 - 64 bytes, with each byte corresponding to the status of one MODBUS send or receive operation for the remote device.
/// Byte 0 is the most recent.</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void GetCommEventLog(byte deviceAddress, out ushort status, out ushort eventCount, out ushort messageCount, out byte[] events, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.GetCommEventLog, 0,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
SendReceive(deviceAddress, ModbusFunctionCode.GetCommEventLog, timeout, telegramLength, -1, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
status = 0;
eventCount = 0;
messageCount = 0;
events = null;
return;
}
var byteCnt = _Buffer[dataPos];
status = ModbusUtils.ExtractUShort(_Buffer, dataPos + 1);
eventCount = ModbusUtils.ExtractUShort(_Buffer, dataPos + 3);
messageCount = ModbusUtils.ExtractUShort(_Buffer, dataPos + 5);
events = new byte[byteCnt - 6];
Array.Copy(_Buffer, dataPos + 7, events, 0, events.Length);
}
/// <summary>
/// Sends a Write Single Register (0x06) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="address">Address of the register: 0x0000 .. 0xFFFF</param>
/// <param name="value">Register value to write</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void WriteSingleRegister(byte deviceAddress, ushort address, ushort value, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.WriteSingleRegister, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, address);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, value);
SendReceive(deviceAddress, ModbusFunctionCode.WriteSingleRegister, timeout, telegramLength, 4, telegramContext, ref dataPos);
}
/// <summary>
/// Sends a Get Comm Event Counter (0x0B) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="status">Receives the status word of the device.</param>
/// <param name="eventCount">Receives the event counter of the device.</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void GetCommEventCounter(byte deviceAddress, out ushort status, out ushort eventCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.GetCommEventCounter, 0,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
SendReceive(deviceAddress, ModbusFunctionCode.GetCommEventCounter, timeout, telegramLength, 4, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
status = 0;
eventCount = 0;
return;
}
status = ModbusUtils.ExtractUShort(_Buffer, dataPos);
eventCount = ModbusUtils.ExtractUShort(_Buffer, dataPos + 2);
}
/// <summary>
/// Sends a Read Coils (0x01) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Start address: 0x0000 .. 0xFFFF</param>
/// <param name="coilCount">>Number of coils to read: 1 .. 2000</param>
/// <param name="timeout">Timeout for response in Milli seconds.</param>
/// <returns>Returns a byte array which contains the coils. The coils are written as single bits into the array starting with coil 1 at the lsb.</returns>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual byte[] ReadCoils(byte deviceAddress, ushort startAddress, ushort coilCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.ReadCoils, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, coilCount);
short desiredDataLength = (short)(1 + coilCount / 8);
if (coilCount % 8 != 0)
{
++desiredDataLength;
}
var dataLength = SendReceive(deviceAddress, ModbusFunctionCode.ReadCoils, timeout, telegramLength, desiredDataLength, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
var coils = new byte[dataLength - 1];
Array.Copy(_Buffer, dataPos + 1, coils, 0, dataLength - 1);
// Send data to whom ever interested
string displayString = "<-- " + HexEncoding.ToString(_Buffer, 0, dataLength + 4) + "\r\n";
if (NewSerialDataRecieved != null)
{
NewSerialDataRecieved(this, new ReceivedDataEventArgs(displayString));
}
//*********************************
return(coils);
}
/// <summary>
/// Sends a Write Single Coils (0x05) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="address">Address of the coil: 0x0000 .. 0xFFFF</param>
/// <param name="value">0xFF00 for true or 0x0000 for false</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void WriteSingleCoil(byte deviceAddress, ushort address, ushort value, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.WriteSingleCoil, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, address);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, value);
SendReceive(deviceAddress, ModbusFunctionCode.WriteSingleCoil, timeout, telegramLength, 4, telegramContext, ref dataPos);
// Send data to whom ever interested
string displayString = "<-- " + HexEncoding.ToString(_Buffer, 0, telegramLength) + "\r\n";
if (NewSerialDataRecieved != null)
{
NewSerialDataRecieved(this, new ReceivedDataEventArgs(displayString));
}
//*********************************
}
private void ReadDiscreteInputs(IModbusInterface intf, bool isBroadcast, object telegramContext, ModbusFunctionCode fc, short dataPos, short dataLength)
{
if (dataLength < 4)
{
SendErrorResult(intf, isBroadcast, _deviceAddress, telegramContext, fc, ModbusErrorCode.IllegalDataValue);
}
else
{
ushort startAddress = ModbusUtils.ExtractUShort(_buffer, dataPos);
ushort inputCount = ModbusUtils.ExtractUShort(_buffer, dataPos + 2);
byte[] inputs;
if (inputCount % 8 == 0)
{
inputs = new byte[inputCount / 8];
}
else
{
inputs = new byte[inputCount / 8 + 1];
inputs[inputs.Length - 1] = 0;
}
var err = OnReadDiscreteInputs(isBroadcast, startAddress, inputCount, inputs);
if (isBroadcast)
{
return;
}
if (err != ModbusErrorCode.NoError)
{
SendErrorResult(intf, false, _deviceAddress, telegramContext, fc, err);
}
else
{
short telegramLength;
intf.CreateTelegram(_deviceAddress, (byte)fc, (short)(1 + inputs.Length), _buffer, out telegramLength, out dataPos, true, ref telegramContext);
_buffer[dataPos] = (byte)(inputs.Length);
Array.Copy(inputs, 0, _buffer, dataPos + 1, inputs.Length);
intf.SendTelegram(_buffer, telegramLength);
}
}
}
/// <summary>
/// Sends a Write Multiple Coils (0x0F) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Address of the 1st coil: 0x0000 .. 0xFFFF</param>
/// <param name="coilCount">Number of coils to write.</param>
/// <param name="coils">Byte array with bit coded coil values.</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void WriteMultipleCoils(byte deviceAddress, ushort startAddress, ushort coilCount, byte[] coils, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
byte byteCnt = (byte)(coilCount / 8);
if ((coilCount % 8) > 0)
{
byteCnt++;
}
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.WriteMultipleCoils, (short)(5 + byteCnt),
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, coilCount);
_Buffer[dataPos + 4] = byteCnt;
Array.Copy(coils, 0, _Buffer, dataPos + 5, byteCnt);
SendReceive(deviceAddress, ModbusFunctionCode.WriteMultipleCoils, timeout, telegramLength, 4, telegramContext, ref dataPos);
}
/// <summary>
/// Sends a Read Holding Registers (0x03) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Start address: 0x0000 .. 0xFFFF</param>
/// <param name="registerCount">Number of the registers to read.</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <returns>Returns an array of 16 bit register values.</returns>
/// <remarks>
/// A register is a 16 bit unsigned value.
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual ushort[] ReadHoldingRegisters(byte deviceAddress, ushort startAddress, ushort registerCount, int timeout = 2000)
{
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.ReadHoldingRegisters, 4,
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, registerCount);
short desiredDataLength = (short)(1 + 2 * registerCount);
var dataLength = SendReceive(deviceAddress, ModbusFunctionCode.ReadHoldingRegisters, timeout, telegramLength, desiredDataLength, telegramContext, ref dataPos);
if (deviceAddress == ModbusConst.BroadcastAddress)
{
return(null);
}
var registers = new ushort[(dataLength - 1) / 2];
for (int n = 0; n < registers.Length; ++n)
{
registers[n] = ModbusUtils.ExtractUShort(_Buffer, dataPos + 1 + 2 * n);
}
// Send data to whom ever interested
string displayString = "<-- " + HexEncoding.ToString(_Buffer, 0, dataLength + 4) + "\r\n";
if (NewSerialDataRecieved != null)
{
NewSerialDataRecieved(this, new ReceivedDataEventArgs(displayString));
}
//*
return(registers);
}
private void WriteMultipleRegisters(IModbusInterface intf, bool isBroadcast, object telegramContext, ModbusFunctionCode fc, short dataPos, short dataLength)
{
if (dataLength < 5)
{
SendErrorResult(intf, isBroadcast, _deviceAddress, telegramContext, fc, ModbusErrorCode.IllegalDataValue);
}
else
{
ushort startAddress = ModbusUtils.ExtractUShort(_buffer, dataPos);
ushort registerCount = ModbusUtils.ExtractUShort(_buffer, dataPos + 2);
//byte byteCount = _Buffer[dataPos + 4];
ushort[] registers = new ushort[registerCount];
for (int i = 0; i < registerCount; i++)
{
registers[i] = ModbusUtils.ExtractUShort(_buffer, dataPos + 5 + 2 * i);
}
var err = OnWriteMultipleRegisters(isBroadcast, startAddress, registers);
if (isBroadcast)
{
return;
}
if (err != ModbusErrorCode.NoError)
{
SendErrorResult(intf, false, _deviceAddress, telegramContext, fc, err);
}
else
{
short telegramLength;
intf.CreateTelegram(_deviceAddress, (byte)fc, 4, _buffer, out telegramLength, out dataPos, true, ref telegramContext);
ModbusUtils.InsertUShort(_buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_buffer, dataPos + 2, registerCount);
intf.SendTelegram(_buffer, telegramLength);
}
}
}
/// <summary>
/// Sends a Write Multiple Coils (0x10) telegram to a device and waits for the response
/// </summary>
/// <param name="deviceAddress">Address of the modbus device.</param>
/// <param name="startAddress">Address of the 1st register: 0x0000 .. 0xFFFF</param>
/// <param name="registers">Register values to write</param>
/// <param name="offset">Offset in register of the 1st register to write</param>
/// <param name="count">Number of registers to write</param>
/// <param name="timeout">Timeout for response in milli seconds.</param>
/// <remarks>
/// Look at http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf for more details.
/// </remarks>
public virtual void WriteMultipleRegisters(byte deviceAddress, ushort startAddress, ushort[] registers, int offset, int count, int timeout = 2000)
{
if (offset < 0 || offset >= registers.Length)
{
throw new ArgumentException("offset");
}
if (offset + count > registers.Length)
{
throw new ArgumentException("count");
}
short telegramLength;
short dataPos;
object telegramContext = null;
_Interface.CreateTelegram(deviceAddress, (byte)ModbusFunctionCode.WriteMultipleRegisters, (short)(5 + 2 * count),
_Buffer, out telegramLength, out dataPos, false, ref telegramContext);
ModbusUtils.InsertUShort(_Buffer, dataPos, startAddress);
ModbusUtils.InsertUShort(_Buffer, dataPos + 2, (ushort)count);
_Buffer[dataPos + 4] = (byte)(2 * count);
for (int i = 0; i < count; i++)
{
ModbusUtils.InsertUShort(_Buffer, dataPos + 5 + 2 * i, registers[offset + i]);
}
SendReceive(deviceAddress, ModbusFunctionCode.WriteMultipleRegisters, timeout, telegramLength, 4, telegramContext, ref dataPos);
// Send data to whom ever interested
string displayString = "<-- " + HexEncoding.ToString(_Buffer, 0, 8) + "\r\n";
if (NewSerialDataRecieved != null)
{
NewSerialDataRecieved(this, new ReceivedDataEventArgs(displayString));
}
//******
}
