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THE USB-485 COMMUNICATION INTERFACE IS A PROTOCOL CONVERTER USED TO CONNECT A PC’S USB PORT TO THE RS-485 INPUT ON YOUR KANTECH CONTROLLER KT-1/KT-200/KT-300/KT-400. THE MAXIMUM BUS LENGTH IS 1,200 M (4,000 FT) WHEN USING AN ETHERNET GRADE 3, UNSHIELDE D, TWO TWISTED PAIR CABLE (BELDEN # 1227A RECOMMENDED).