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Continue to ChatAcksys RD300-OFR - Multipoint & fault tolerant universal Serial RS232 / RS422 / RS485 to multimode optic fiber media converter https://www.concretespares.ie/product/acksys-rd300-ofr-multipoint-fault-tolerant-universal-serial-rs232-rs422-rs485-to-multimode-optic-fiber-media-converter/