/// <summary>
/// Test a modbus RTU slave
/// </summary>
static void Test_ModbusRTUSlave()
{
byte unit_id = 1;
// Created datastore for unit ID 1
Datastore ds = new Datastore(unit_id);
// Crete instance of modbus serial RTU (replace COMx with a free serial port - ex. COM5)
ModbusSlaveSerial ms = new ModbusSlaveSerial(new Datastore[] { ds }, ModbusSerialType.RTU, "COM7", 19200, 8, Parity.Even, StopBits.One, Handshake.None);
// Start listen
ms.StartListen();
// Print and write some registers...
Random rnd = new Random();
while (true)
{
Console.Write(
"---------------------- READING ----------------------" + Environment.NewLine +
"Input register n.1 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).InputRegisters[30001].ToString("D5") + Environment.NewLine +
"Input register n.1 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).InputRegisters[30002].ToString("D5") + Environment.NewLine +
"Input register n.2 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).InputRegisters[30003].ToString("D5") + Environment.NewLine);
//"Coil register n.32 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).Coils[31].ToString() + Environment.NewLine +
//"---------------------- WRITING ----------------------" + Environment.NewLine);
//ms.ModbusDB.Single(x => x.UnitID == unit_id).HoldingRegisters[1] = (ushort)rnd.Next(ushort.MinValue, ushort.MaxValue);
//Console.WriteLine(
// "Holding register n.2 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).HoldingRegisters[1].ToString("D5"));
//ms.ModbusDB.Single(x => x.UnitID == unit_id).Coils[15] = Convert.ToBoolean(rnd.Next(0, 1));
//Console.WriteLine(
// "Coil register n.16 : " + ms.ModbusDB.Single(x => x.UnitID == unit_id).Coils[15].ToString());
// Exec the cicle each 2 seconds
Thread.Sleep(2000);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="modbus_db">Modbus databases array</param>
/// <param name="local_address">Local listening IP addresses</param>
/// <param name="port">Listening TCP port</param>
public ModbusSlaveUDP(Datastore[] modbus_db, IPAddress local_address, int port)
: base(modbus_db)
{
// Set device states
connection_type = ConnectionType.UDP_IP;
// Create UDP listener
udpl = new UdpClient(new IPEndPoint(local_address, port));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="ds">Database Modbus</param>
public ModbusSlave(Datastore[] ds)
{
// Device status
device_type = DeviceType.SLAVE;
// Assign modbus database
modbus_db = ds;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="modbus_db">Modbus database array</param>
/// <param name="local_address">Local listening IP addresses</param>
/// <param name="port">Listening TCP port</param>
public ModbusSlaveTCP(Datastore[] modbus_db, IPAddress local_address, int port)
: base(modbus_db)
{
// Set device states
connection_type = ConnectionType.TCP_IP;
// Crete TCP listener
tcpl = new TcpListener(local_address, port);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="modbus_db">Modbus database</param>
/// <param name="type">Type of serial modbus protocol (RTU or ASCII)</param>
/// <param name="port">Serial port name</param>
/// <param name="baudrate">Baudrate</param>
/// <param name="databits">Data bits</param>
/// <param name="parity">Parity</param>
/// <param name="stopbits">Stop bits</param>
/// <param name="handshake">Control flux</param>
public ModbusSlaveSerial(Datastore[] modbus_db, ModbusSerialType type, string port, int baudrate, int databits, Parity parity, StopBits stopbits, Handshake handshake)
: base(modbus_db)
{
// Set modbus serial protocol type
switch (type)
{
case ModbusSerialType.ASCII:
connection_type = ConnectionType.SERIAL_ASCII;
break;
case ModbusSerialType.RTU:
connection_type = ConnectionType.SERIAL_RTU;
break;
}
// Set serial port instance
sp = new SerialPort(port, baudrate, parity, databits, stopbits);
sp.Handshake = handshake;
// Calc interframe delay
interframe_delay = GetInterframeDelay(sp);
// Calc interchar delay
interchar_delay = GetIntercharDelay(sp);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="ds">Database Modbus</param>
public ModbusSlave(Datastore[] ds)
{
// Device status
device_type = DeviceType.SLAVE;
// Assign modbus database
modbus_db = ds;
// Initialize timer
sw_ch = new Stopwatch();
}
