Full-duplex RS-485 transceiver for industrial buses
It targets industrial communication links — PLC I/O modules, motor drives, building automation gateways — where the bus runs over twisted-pair cable in electrically noisy environments. The 70 mV receiver hysteresis provides a clean noise margin on the differential inputs, and the full-duplex capability lets the bus carry simultaneous transmit and receive on separate wire pairs without a direction-control pin.
At 400 kbps this transceiver handles the common RS-485 baud rates up to 38400 or 115200 with margin, but it is not intended for the multi-megabit PROFIBUS or DMX512 links that need 10 Mbps or higher. The 400 kbps ceiling suits applications where cable length runs tens to hundreds of metres — the slower edge rate reduces reflections and EMI compared to a higher-speed part on the same twisted pair. If your design needs a faster bus, the SN65HVD1471 family includes higher-rate variants (check the base product number 65HVD1471 for speed options); this specific DGK suffix locks in the 400 kbps grade.