The DYMEC C39S Serial Link – fiber converter allows RS-232 /422 /485 signals to be bi-directionally converted to fiber optic signaling and extend the distance to < 40 KM over single-mode fiber. By using fiber optic transmission technology, the DYMEC C39S provides a stable and error free data transmission within industrial environments that present electrical noise & ground differential challenges, especially over long distances. The DYMEC C39S supports multiple data formats, baud rates, data direction & Auto-configuration. The C39S provides superior 3000 Volt DC Isolation, combined with internal surge protection. The best in Power Control SCADA Applications.