Configure a Modbus RTU connection

This guide shows how to add and configure a Modbus RTU (serial) connection in ModbusScope.

Steps

  1. Go to Settings > Connection.

  2. If more than one connection slot is available, select the one you want to configure and enable it with the Enabled checkbox. Connection 1 is always enabled.

  3. Set Protocol to RTU.

  4. Set Serial port to the port name on your system (e.g. COM3 on Windows, /dev/ttyS0 on Linux).

  5. Set Baud rate to match the device (common values: 9600, 19200, 115200).

  6. Set Parity to match the device (None, Even, or Odd).

  7. Set Data bits to match the device (typically 8).

  8. Set Stop bits to match the device (typically 1 or 2).

  9. Set Timeout to the maximum time in milliseconds to wait for a response.

  10. Click OK.

Result: The connection is saved. You can now link a device to it in Settings > Device.

All serial parameters (baud rate, parity, data bits, stop bits) must match the settings on the physical Modbus bus. A mismatch will prevent communication.

See also