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» Connect to your RS-485 network via RJ-45 modular connectors or screw-block terminals. 03/22/2010 724-746-5500 #26577 OVERVIEW BLACK BOX ® RS-485 Repeaters extend your RS-485 communications beyond the 4000-foot limit. Even located 5000 feet from your master device, they’ll take your RS-485 communications signals and shoot them another 4000 feet.