The EL6002 serial interface enables the connection of devices with two RS232 interfaces. The devices connected to the EL6002 EtherCAT Terminal communicate with the automation device via the Coupler. The active communication channel operates independently of the higher-level EtherCAT system in full duplex mode with 300 baud up to 115.2 kbaud. The RS232 interfaces guarantee high interference immunity through electrically isolated signals.

In conjunction with the TwinCAT Virtual Serial COM Driver, the EL6002 can be used as a normal Windows COM interface.

https://www.beckhoff.com/vi-vn/products/i-o/ethercat-terminals/el6xxx-communication/el6002.html