The Phoenix Contact 2708342, also known as the PSI‑MOS‑RS422/FO 660 E, is a rugged DIN‑rail-mounted media converter that bridges RS-422/RS-485 serial networks (including full‑duplex INTERBUS) with 660 nm fiber-optic links. Equipped with built-in optical diagnostics and a relay alarm output, it ensures reliable data communication up to 2 Mbps—ideal for industrial environments, including hazardous Zone 2 areas and marine installations.

Key Features

Model: PSI‑MOS‑RS422/FO 660 E (Item 2708342)
Serial Support: RS‑422/RS‑485 4-wire, full-duplex, up to 2 Mbps; supports INTERBUS protocol
Fiber Interface: Single 660 nm FSMA port (polymer/PCF); reach 100 m (980 µm) or 800 m (200 µm)
Diagnostics: Integrated optical monitoring plus alarm relay output for link failure
Power: 18–30 V DC; ~100 mA typical, 24 V via DIN-rail power bus
Robust Ratings: IP20, –20 °C to +60 °C; shock/vibration tested per EN/IEC standards
Certifications: CE, UL, ATEX Zone 2, DNV‑GL marine approval
Housing: Compact (35 × 99 × 103 mm), green PA 6.6-FR, DIN‑rail mountable

Phoenix Contact – 2708342 (PSI-MOS-RS422/FO 660 E) – RS-422/RS-485

Phoenix Contact – 2708342 (PSI-MOS-RS422/FO 660 E) – RS-422/RS-485