The optical interface USB-OPT-3 allows data transfer between devices with USB interface (e. PC, notebook, handheld terminal) and electronic energy meters or other devices with optical interface according IEC 62056-21 (formerly known as EN 1107, also called "1107" or "FLAG"). Standard baud rate up to 115kbps cab be used. The signals DTR, CTS, DSR and DCD are not supported. 0 input, as well as two SPDIF outputs in coaxial and optical Toslink format and one output I2S 5-pin. No customer reviews yet, login to write a. The optoUSB2. 0 with high quality shield connection. 5mm optical port, TOSLINK plug adaptor included. The UT23 connects to your computer via USB and sends out an optical SPDIF signal.