/// <summary>
/// Test modbus RTU master function on a slave RTU id = 5
/// </summary>
private static void Test_ModbusRTUMaster()
{
byte unit_id = 5;
// Create instance of modbus serial RTU (replace COMx with a free serial port - ex. COM5).
ModbusMasterSerial mm = new ModbusMasterSerial(ModbusSerialType.RTU, "COM20", 9600, 8, Parity.Even, StopBits.One, Handshake.None);
// Initialize the MODBUS connection.
mm.Connect();
// Read and write some registers on RTU n. 5.
Random rnd = new Random();
while (true)
{
// Print some nice formatting to the console.
Console.WriteLine("---------------------- READING ----------------------");
// Read from a register.
ushort inputReg1 = mm.ReadHoldingRegisters(unit_id, 0, 1).First();
// Print the result to the console.
Console.WriteLine("Holding register n.1 : " + inputReg1.ToString("D5"));
// Read from another register.
ushort inputReg41 = mm.ReadInputRegisters(unit_id, 40, 1).First();
// Print the result to the console.
Console.WriteLine("Input register n.41 : " + inputReg41.ToString("D5"));
// Read from a coil.
bool coil23 = mm.ReadCoils(unit_id, 22, 1).First();
// Print the results to the console.
Console.WriteLine("Coil register n 23 : " + coil23.ToString());
// Print some nice formatting to the console.
Console.WriteLine("---------------------- WRITING ----------------------");
// Write to a register.
mm.WriteSingleRegister(unit_id, 4, (ushort)rnd.Next(ushort.MinValue, ushort.MaxValue));
// ...then read it back.
ushort holdingReg4 = mm.ReadHoldingRegisters(unit_id, 4, 1).First();
// Print the result to the console.
Console.WriteLine("Holding register n.5 : " + holdingReg4.ToString("D5") + Environment.NewLine);
// Write to another register.
mm.WriteSingleCoil(unit_id, 2, Convert.ToBoolean(rnd.Next(0, 1)));
// ...then read it back.
bool holdingReg3 = mm.ReadCoils(unit_id, 2, 1).First();
// Print the result to the console.
Console.WriteLine("Coil register n.3 : " + holdingReg3.ToString() + Environment.NewLine);
// Repeat every 2 seconds.
Thread.Sleep(2000);
}
}
/// <summary>
/// Test modbus RTU master function on a slave RTU id = 5
/// </summary>
static void Test_ModbusRTUMaster()
{
byte unit_id = 5;
// Crete instance of modbus serial RTU (replace COMx with a free serial port - ex. COM5)
ModbusMasterSerial mm = new ModbusMasterSerial(ModbusSerialType.RTU, "COM1", 9600, 8, Parity.Even, StopBits.One, Handshake.None);
// Exec the connection
mm.Connect();
// Read and write some registers on RTU n. 5
Random rnd = new Random();
while (true)
{
Console.Write(
"---------------------- READING ----------------------" + Environment.NewLine +
"Holding register n.1 : " + mm.ReadHoldingRegisters(unit_id, 0, 1).First().ToString("D5") + Environment.NewLine +
"Input register n.41 : " + mm.ReadInputRegisters(unit_id, 40, 1).First().ToString("D5") + Environment.NewLine +
"Coil register n 23 : " + mm.ReadCoils(unit_id, 22, 1).First().ToString() + Environment.NewLine +
"---------------------- WRITING ----------------------" + Environment.NewLine);
mm.WriteSingleRegister(unit_id, 4, (ushort)rnd.Next(ushort.MinValue, ushort.MaxValue));
Console.WriteLine(
"Holding register n.5 : " + mm.ReadHoldingRegisters(unit_id, 4, 1).First().ToString("D5") + Environment.NewLine);
mm.WriteSingleCoil(unit_id, 2, Convert.ToBoolean(rnd.Next(0, 1)));
Console.WriteLine(
"Coil register n.3 : " + mm.ReadCoils(unit_id, 2, 1).First().ToString() + Environment.NewLine);
// Exec the cicle each 2 seconds
Thread.Sleep(2000);
}
}
/// <summary>
/// Read Input Registers.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ButtonInputRegisterRead_Click(object sender, EventArgs e)
{
try
{
// Get the selected device address.
byte slaveAddr = GetDeviceAddress();
// If the register address text box is empty...
if (string.IsNullOrWhiteSpace(textBoxInputRegisterAddressDecimal.Text))
{
// Convert from hex.
TextBoxInputRegisterAddressHex_Leave(null, null);
}
// Get the selected register address.
ushort regAddr = GetRegisterAddress(textBoxInputRegisterAddressDecimal.Text);
// Get the selected data format.
DataType dataType = GetDataFormat(comboBoxInputRegisterFormat);
// Calculate the number of registers to read.
ushort numRegs = 2;
if (dataType == DataType.String)
{
numRegs = GetNumRegisters(textBoxInputRegisterStringLength.Text);
}
// Read from the device.
ushort[] regValues = _mbMaster.ReadInputRegisters(slaveAddr, regAddr, numRegs);
// Format and display the data.
textBoxInputRegisterData.Text = RegistersToString(dataType, regValues);
// Update the status.
toolStripStatusLabel1.Text = "Input Register Read Successfully";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, ex.GetType().Name.ToString());
}
}
private void button1_Click(object sender, EventArgs e)
{
byte unit_id = 1;
// Crete instance of modbus serial RTU (replace COMx with a free serial port - ex. COM5)
ModbusMasterSerial mm = new ModbusMasterSerial(ModbusSerialType.RTU, "COM1", 9600, 8, Parity.Even, StopBits.One, Handshake.None);
// Exec the connection
mm.Connect();
// Read and write some registers on RTU n. 5
Random rnd = new Random();
while (true)
{
textBox1.Text = "Holding register n.1 : " + mm.ReadHoldingRegisters(unit_id, 0, 1).First().ToString("D5") +
"Input register n.41 : " + mm.ReadInputRegisters(unit_id, 40, 1).First().ToString("D5") +
"Coil register n 23 : " + mm.ReadCoils(unit_id, 22, 1).First().ToString();
mm.WriteSingleRegister(unit_id, 4, (ushort)rnd.Next(ushort.MinValue, ushort.MaxValue));
textBox2.Text = "Holding register n.5 : " + mm.ReadHoldingRegisters(unit_id, 4, 1).First().ToString("D5");
mm.WriteSingleCoil(unit_id, 2, Convert.ToBoolean(rnd.Next(0, 1)));
textBox3.Text = "Coil register n.3 : " + mm.ReadCoils(unit_id, 2, 1).First().ToString();
// Exec the cicle each 2 seconds
Thread.Sleep(2000);
}
}
