This 8-port expansion hub is used to distribute RS-485 signals and power to devices located up to 4000 ft away. Because RS-485 signals travel farther along the line, you can run dedicated cable without having to purchase expensive repeaters, couplers, amplifiers. You'll also save money by reducing the amount of wiring used, since devices connected to the RS-485 line can be daisy chained, instead of home run.
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