# Communications

Cognex Designer supports the following types of communication Devices:

- I/O communication cards (both physical and simulated).
- FTP client devices.
- RS232 serial devices.
- TCP/IP communications.

Additionally, the following Cognex Designer communications Devices are also available as optional plug-ins.

- Modbus protocol serial communications.
- TwinCAT 2/3 communications
- OPC UA Server communications

These Devices are available if they have been selected for installation when installing Cognex Designer.