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