RS-485 uses a single
pair cable for half-duplex systems, but full-duplex implementation requires two signal pairs. A full-duplex system allows simultaneous transmission of data on one pair while receiving data on the other pair. A four-
pair cable can be used to support implementation of two full duplex networks.
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RS-485 is an industrial specification that defines the electrical interface and physical layer for point-to-point communication of electrical devices. The RS-485 standard allows for long cabling distances in electrically noisy environments and can support multiple devices on the same bus.
