void MakeSureClientIsConnected()
{
if (_client != null && !_client.Connected)
{
_client.Dispose();
_client = null;
_adapter.Dispose();
_adapter = null;
_master.Dispose();
_master = null;
}
if (_client == null)
{
_client = new TcpClient(_configuration.Ip, _configuration.Port);
_adapter = new TcpClientAdapter(_client);
var factory = new ModbusFactory();
if (_configuration.UseASCII)
{
_master = factory.CreateAsciiMaster(_adapter);
}
else if (_configuration.Protocol == Protocol.Tcp)
{
_master = factory.CreateMaster(_client);
}
else
{
_master = factory.CreateRtuMaster(_adapter);
}
}
}
private IModbusMaster CreateTcpMaster(ModbusFactory factory)
{
_tcpClient = new TcpClient(_configurationSettings.IpAddress, _configurationSettings.IpPort);
IModbusMaster master = null;
if (_configurationSettings.ConnectionType.CurrentType == ConnectionType.TcpIp)
{
master = factory.CreateMaster(_tcpClient);
}
if (_configurationSettings.ConnectionType.CurrentType == ConnectionType.RtuAsciiOverTcpIp)
{
var adapter = new TcpClientAdapter(_tcpClient);
if (_configurationSettings.UseRtu)
{
master = factory.CreateRtuMaster(adapter);
}
if (_configurationSettings.UseAscii)
{
master = factory.CreateAsciiMaster(adapter);
}
}
master.Transport.ReadTimeout = _configurationSettings.Timeout;
return(master);
}
/// <summary>
/// Simple Modbus serial ASCII master read holding registers example.
/// </summary>
public static void ModbusSerialAsciiMasterReadRegisters()
{
using (SerialPort port = new SerialPort(PrimarySerialPortName))
{
// configure serial port
port.BaudRate = 9600;
port.DataBits = 8;
port.Parity = Parity.None;
port.StopBits = StopBits.One;
port.Open();
var factory = new ModbusFactory();
IModbusSerialMaster master = factory.CreateAsciiMaster(port);
byte slaveId = 1;
ushort startAddress = 1;
ushort numRegisters = 5;
// read five registers
ushort[] registers = master.ReadHoldingRegisters(slaveId, startAddress, numRegisters);
for (int i = 0; i < numRegisters; i++)
{
Console.WriteLine($"Register {startAddress + i}={registers[i]}");
}
}
// output:
// Register 1=0
// Register 2=0
// Register 3=0
// Register 4=0
// Register 5=0
}
private IModbusMaster CreateSerialPortMaster(ModbusFactory factory)
{
IModbusMaster master = null;
_serialPort = new SerialPort
{
PortName = _configurationSettings.SerialPort,
BaudRate = _configurationSettings.BaudRate.Current,
DataBits = _configurationSettings.DataBits,
Parity = _configurationSettings.Parity,
StopBits = _configurationSettings.StopBits
};
_serialPort.Open();
if (_configurationSettings.UseRtu)
{
master = factory.CreateRtuMaster(new SerialPortAdapter(_serialPort));
}
if (_configurationSettings.UseAscii)
{
master = factory.CreateAsciiMaster(new SerialPortAdapter(_serialPort));
}
master.Transport.ReadTimeout = _configurationSettings.Timeout;
return(master);
}