/// <summary>
/// Constructor
/// </summary>
/// <param name="config">Configuration structure</param>
public ModbusLinkRtu(ModbusConfiguration config)
{
// Init serial port driver
PHY = new ModbusSerialPort(config);
// Init link layer thread
LinkThread = new Thread(ModbusRtuLinkTask);
// Configure frame timing and set handler
ConfigureTiming(config.BaudRate);
FramingTimer.OnTimeout += FramingTimeoutHandler;
}
private void bttnConnection_Click(object sender, EventArgs e)
{
if (ProtocolHandler == null || !ProtocolHandler.Connected)
{
// ProtocolHandler not initalized or disconnected
ModbusConfiguration config = new ModbusConfiguration()
{
PortName = cmbPorts.SelectedItem.ToString(),
BaudRate = baudrates[cmbBaud.SelectedItem.ToString()],
ClientAddress = 0x1,
IsServer = true,
ProtocolType = ModbusProtocolType.ASCII,
};
// Init new instance of application layer
ProtocolHandler = new Modbus(config);
ProtocolHandler.Coils.OnValueUpdated += Coils_OnValueUpdated;
ProtocolHandler.HoldingRegisters.OnValueUpdated += HoldingRegisters_OnValueUpdated;
ProtocolHandler.Coils.Write(0x0000, false, true);
ProtocolHandler.HoldingRegisters.Write(0x0000, 0x0000, true);
// Try to connect to bus
if (!ProtocolHandler.Connect())
{
MessageBox.Show("Error during connection, try again.");
return;
}
if (ProtocolHandler.IsServer)
{
UpdateTimer.Interval = 200;
UpdateTimer.Tick += UpdateTimer_Tick;
UpdateTimer.Start();
}
// Update controls
bttnConnection.Text = "Disconnect";
cmbPorts.Enabled = false;
cmbBaud.Enabled = false;
grpData.Enabled = true;
}
else
{
UpdateTimer.Stop();
// Disconnect from bus
ProtocolHandler.Disconnect();
// Update controls
bttnConnection.Text = "Connect";
cmbPorts.Enabled = true;
cmbBaud.Enabled = true;
grpData.Enabled = false;
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="config">Configuration structure</param>
public ModbusSerialPort(ModbusConfiguration config)
{
Port = new SerialPort()
{
PortName = config.PortName,
BaudRate = config.BaudRate,
DataBits = 8,
Parity = Parity.None,
StopBits = StopBits.Two,
WriteTimeout = 100,
ReadTimeout = 100
};
Port.DataReceived += Port_DataReceivedHandler;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="config">Configuration structure</param>
public ModbusLinkAscii(ModbusConfiguration config)
{
// Init serial port driver
PHY = new ModbusSerialPort(config);
// Init link layer thread
LinkThread = new Thread(ModbusAsciiLinkTask)
{
Name = "Modbus Link Layer Thread",
Priority = ThreadPriority.Normal
};
// Configure timeout timer
TimeoutCounter.Interval = 1000;
TimeoutCounter.AutoReset = false;
TimeoutCounter.Elapsed += TimeoutHandler;
}
public Modbus(ModbusConfiguration config)
{
switch (config.ProtocolType)
{
case ModbusProtocolType.ASCII:
link = new ModbusLinkAscii(config);
break;
case ModbusProtocolType.RTU:
link = new ModbusLinkRtu(config);
break;
default:
throw new ArgumentException("INVALID_CONFIG: ProtocolType");
}
IsServer = config.IsServer;
ClientAddress = config.ClientAddress;
link.OnMessageReceived += ModbusLink_MessageReceivedHandler;
link.OnTimeoutOccured += ModbusLink_TimeoutHandler;
}