Multimode Fiber-Optic EIA-485 Transceivers Safely add isolated segments to multidrop and point-to-point EIA-485 networks, separated by up to 4 kilometers. Improve safety, signal integrity, and reliability by using two optical fibers instead of wire to transfer bidirectional serial data. Fiber-Optic Link to EIA-485— Connect to two- or. Moxa's industrial-grade serial-to-fiber optic converters can convert RS-232/422/485 to optical fiber, which provides users with an easy and reliable way to communicate with their serial devices. A verification email has been sent to {0}. Panel Mount Metal Chassis ULI-212CI - Triple Isolated RS-232/422/485 (Terminal Block) to Single Mode Fiber Converter (ST Connectors). Gigabit fiber optic converter with SFP port for 1000Base-T, DIN rail mountable.