RS232/422/485 to Single-Mode Fiber Optic Converter

RS-232/422/485 to Single-Mode Fiber Optic Converter – ATC-277SM

The ATC-277SM is a multifunctional serial-to-fiber optic MODEM converter designed to connect remote terminal units (RTUs) to a host or distributed data acquisition system (SCADA controller).
By using optical fiber as the transmission medium, the device significantly improves communication performance and provides protection against lightning, surge, and electromagnetic interference (EMI) — making it ideal for harsh industrial environments.

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Key Features

• Supports Point-to-Point (Asynchronous, Half/Full Duplex) and Multi-Drop (Asynchronous, Half Duplex) communication modes

• Interfaces: RS-232, RS-422, or RS-485

• Transmission Line: Dual single-mode optical fiber

• RS-232 Data Rate: 0 ~ 115.2 Kbps

• RS-422/485 Data Rate: 0 ~ 921.4 Kbps

• Transmission Distance:

  • RS-485/RS-422: up to 1.2 km

  • Optical fiber: up to 20 km (typical, single-mode glass fiber)

• Optical Wavelength: 1310 nm

• Power Budget: 12.1 dB (typical)

• Connectors:

  • RS-232: DB9 male

  • RS-422/485: 6-pin terminal block

  • Fiber: SC connector

• Protection: Strong resistance to surge, lightning, and EMI