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Continue to ChatAcksys RD320-OFR - Multipoint & Fault Tolerant Universal Serial RS232/RS422/RS485 to single mode optic fiber media converter https://www.concretespares.ie/product/acksys-rd320-ofr-multipoint-fault-tolerant-universal-serial-rs232-rs422-rs485-to-single-mode-optic-fiber-media-converter/