Moxa TCF-142-S-SC: RS-232/422/485 to Fiber Optic Converter. SC Single-mode.
Moxa TCF-142-M-ST Fiber Extender
Amazon.com: MOXA TCF-142-M-SC-T - RS-232/422/485 to Multi-Mode Optical Fiber Media Converter with Fiber Ring Support and SC Connector, -40 to 75C Operating Temperature : Electronics