Rs485 line driver receivers maxim max3082cpa the maxim max3082cpa is a high speed transceiver for rs 485 rs 422 communication and contains one driver and one receiver the device features fail safe circuitry which guarantees a logic high receiver output when the receiver inputs are open or shorted this means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled high impedance maxim max3082cpa rs 485 rs 422 transceiver