The COM ports are used for serial communication, such as Modbus. With an assigned application and a connected field device, serial communication is enabled in a few steps. The following instructions are an example.
- Logged in as administrator to the Connect gateway with minimum EdgeOS version 5.0.13, an assigned Modbus application (for example, DESIGO Optic, minimum version 2.8.5) and field device (for example Siemens e-meter PAC2200).
- In Network > COM ports, connect the selected port (say, COM1) to the application. Modbus protocol is enabled by default.
- In Network > Firewall, open a TCP port for the remote tunnel (say, port 8090).
- Set up the remote tunnel. The URL is automatically given by the application.
- Configure the parameters for the protocol: speed (baud rate), parity and stop bits where indicated in the figure.
- Reboot the device.
- Open the application over the created tunnel in the Devices Application.
The final configuration steps are application specific. Please refer to the application documentation for details.