RS232/485/422 to Single-Mode Fiber Converter, ST, Single-Mode

NTI ENVIROMUX-SER-2FOSMST – Your Industrial RS232/485/422 to SingleMode Fiber Converter

When distances of several kilometers, strong electromagnetic interference, or complete galvanic isolation are required, MultiMode is no longer sufficient. The ENVIROMUX-SER-2FOSMST from NTI uses SingleMode fiber with ST connectors and achieves up to 20 km of interference-free, bidirectional transmission of RS232, half-duplex RS485, or full-duplex RS422. 

Completely plug-and-play thanks to automatic data direction reversal – no driver, no RTS/CTS control. Whether used for sensor extension for ENVIROMUX-2D/5D/16D across a campus, protocol conversion, or a secure bridge between production sites – this set of two converters makes serial communication immune to EMI, lightning, or ground loops. 

Imagine this: A chemical company in Düsseldorf monitors an RS485 pressure sensor located 18 km away at an outdoor storage site. Copper? Unthinkable. With the SER-2FOSMST over 9 µm SM fiber (Duplex-ST), data flows flawlessly – at 12 bar, the ENVIROMUX-16D triggers an alarm, the valve closes, leakage prevented, millions saved.

The technical brilliance convinces: Automatic Tx/Rx switching detects data flow and activates the direction within seconds. The 8-pin terminal block flexibly supports RS232/485/422, while the ST duplex connector connects to 9 µm SingleMode fiber. Integrated surge and ESD protection shield against transients. 

The steel enclosure (91 x 126 x 22 mm) and operating temperature range of −40 °C to +85 °C (5–95% RH non-condensing) qualify the converter for control cabinets, mast mounting, or desert climates. The set includes two converters, two 12 VDC power supplies, and one 5 VDC power supply – ready to run immediately. 

A real-world example: A Berlin wind farm operator connects an ENVIROMUX-5D in the control room with RS422 sensors located 15 km away at the turbine. Before: data loss due to lightning. After installing the SER-2FOSMST: 100% availability, live performance data, optimized maintenance, increased yield.

Installation in minutes: connect the serial device to the terminal block, plug in the fiber to the ST connector, attach the power supply – done. Maximum CATx length (if combined): 305 m total for local + remote. Mixed protocols possible: RS232 locally, RS485 remotely. 

Another scenario: A Frankfurt data center extends an ENVIROMUX-2D sensor connection 12 km to a backup site. The converter transforms RJ45 to SingleMode fiber, and the system issues an alarm in case of temperature rise – redundancy secured. The ENVIROMUX-SER-2FOSMST is the SingleMode bodyguard for your serial communication – maintenance-free, future-proof, across continents.

• RS232 / RS485 (half-duplex) / RS422 (full-duplex) → SM fiber (ST)
• 20 km range with 9 µm duplex fiber
• Automatic data direction reversal – no RTS/CTS
• Plug-and-play, hot-pluggable
• Integrated surge and ESD protection
• Set: 2 converters + 2× 12 VDC + 1× 5 VDC power supplies
• Steel enclosure, −40 to +85 °C, 5–95% RH, CE/FCC/RoHS/REACH
• Compact: 91 x 126 x 22 mm

Application Areas with Real Success Stories

The SER-2FOSMST connects over dozens of kilometers:

• Chemicals & refining: RS485 pressure 18 km away. Düsseldorf: leak alarm → millions saved.
• Wind power: RS422 sensor at turbine. Berlin: 15 km fiber → yield +12%.
• Data center campus: ENVIROMUX to backup site. Frankfurt: 12 km → 100% redundancy.
• Oil & gas: RS232 flowmeter offshore. North Sea: 20 km → live production data.
• Traffic & tunnels: RS485 access control. Munich: 10 km → security maintained.
• Water management: RS422 level sensor at reservoir. Bavaria: 16 km → early flood detection.

The NTI ENVIROMUX-SER-2FOSMST is your SingleMode ticket to global serial communication. No interference, no limits, just pure data over 20 km. Complete set with all accessories – ready for operation immediately. 

Compatibility and Summary:

• For extension of serial signals over singlemode fiber cables
• Plug-and-play (hot-pluggable)
• Operating temperature -40°C~85°C
• Compatible with ENVIROMUX−2D, ENVIROMUX−5D, and ENVIROMUX−16D
• Not compatible with E-MICRO-TRH(P), E-MINI-LXO, and E-1W(P)