public void ReadExample()
{
Console.WriteLine("FYI: ReadExample");
// Create the connection
IPAddress iPAddress = new IPAddress(SETTING_MODBUS_SERVER_TCP_IP);
this.tcpClient = new Socket(iPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
// Attempt to connect to the Modbus slave.
this.tcpClient.Connect(new IPEndPoint(iPAddress, SETTING_MODBUS_SERVER_TCP_PORT));
// We are connected.
Console.WriteLine("FYI: Connected to IP address=[{0}]", this.tcpClient.RemoteEndPoint.ToString());
System.UInt16[] data = new System.UInt16[SETTING_MODBUS_CLIENT_LENGTH];
System.Byte exceptionCode;
unsafe
{
// Set some unmanaged memory up.
IntPtr unmanagedPointer = Marshal.AllocHGlobal(SETTING_MODBUS_CLIENT_LENGTH);
// Send the message
Console.WriteLine("FYI: Sending ReadRegisters message");
uint resultReadRegisters = CASModbusAdapter.ReadRegisters(1, SETTING_MODBUS_CLIENT_DEVICE_ID, CASModbusAdapter.FUNCTION_03_READ_HOLDING_REGISTERS, SETTING_MODBUS_CLIENT_ADDRESS, SETTING_MODBUS_CLIENT_LENGTH, unmanagedPointer, (ushort)(data.Length * sizeof(System.UInt16)), &exceptionCode);
// 1 success
if (resultReadRegisters == CASModbusAdapter.STATUS_SUCCESS)
{
// Extract the data from the unmannged memory into a managed buffer.
CopyBytesIntoPointer(unmanagedPointer, data, 0, SETTING_MODBUS_CLIENT_LENGTH);
Marshal.FreeHGlobal(unmanagedPointer);
this.tcpClient.Close();
// Print the data to the screen.
Console.Write("FYI: Data: ");
foreach (System.UInt16 value in data)
{
Console.Write(value);
Console.Write(", ");
}
Console.WriteLine("");
}
else if (resultReadRegisters == CASModbusAdapter.STATUS_ERROR_MODBUS_EXCEPTION)
{
Console.WriteLine("Modbus.Exception={0}", exceptionCode);
}
else
{
Console.WriteLine("ModbusStack.Error={0}", resultReadRegisters);
}
}
}
public void ReadExample()
{
Console.WriteLine("FYI: ReadExample");
System.UInt16[] data = new System.UInt16[SETTING_MODBUS_CLIENT_LENGTH];
System.Byte exceptionCode;
unsafe
{
// Set some unmanaged memory up.
IntPtr unmanagedPointer = Marshal.AllocHGlobal(SETTING_MODBUS_CLIENT_LENGTH);
// Send the message
Console.WriteLine("FYI: Sending ReadRegisters message");
uint resultReadRegisters = CASModbusAdapter.ReadRegisters(1, SETTING_MODBUS_CLIENT_DEVICE_ID, CASModbusAdapter.FUNCTION_03_READ_HOLDING_REGISTERS, SETTING_MODBUS_CLIENT_ADDRESS, SETTING_MODBUS_CLIENT_LENGTH, unmanagedPointer, (ushort)(data.Length * sizeof(System.UInt16)), &exceptionCode);
// 1 success
if (resultReadRegisters == CASModbusAdapter.STATUS_SUCCESS)
{
// Extract the data from the unmannged memory into a managed buffer.
CopyBytesIntoPointer(unmanagedPointer, data, 0, SETTING_MODBUS_CLIENT_LENGTH);
Marshal.FreeHGlobal(unmanagedPointer);
// Print the data to the screen.
Console.Write("FYI: Data: ");
foreach (System.UInt16 value in data)
{
Console.Write(value);
Console.Write(", ");
}
Console.WriteLine("");
}
else if (resultReadRegisters == CASModbusAdapter.STATUS_ERROR_MODBUS_EXCEPTION)
{
Console.WriteLine("Modbus.Exception={0}", exceptionCode);
}
else
{
Console.WriteLine("ModbusStack.Error={0}", resultReadRegisters);
}
}
}