RS-232 / RS-422 / RS-485 / RS-562

Isolated RS-232 is a serial communication standard defined by TIA/EIA-232-F that conveys data over a simple unterminated, multiconductor cable. Although the original specification was intended for modems, subsequent RS-232 transceivers support general-purpose serial interfaces at data rates up to 1 Mbps. Analog Devices offers a wide range of isolated iCoupler^® and μ‎Module^® RS-232 transceivers that remove ground loops by isolating the logic-level interface and line transceiver, protect against voltage spikes and common-mode transient events so data remains intact, and provide options for integrated dc-to-dc power converters. iCoupler digital isolation technology solutions minimize PCB real estate and enable the power isolation and signal isolation required for system reliability in a noisy environment. μ‎Module RS-232 transceivers offer isolated RS-232 solutions with no external components and up to 1 W of additional power.

RS-485 is a multipoint communication network defined by the TIA-485-A/EIA-485-A standard that specifies up to 32 drivers and 32 receivers on a single (2-wire) bus, with modern transceivers improved to allow 256 nodes on the same bus. The differential signaling scheme and wide common-mode tolerance provide excellent noise immunity for high speed communication over long distances and in harsh environments. Analog Devices’ RS-485/RS-422 compliant transceivers support industrial fieldbus, Modbus and PROFIBUS®, process control networks (PLC), building automation (HVAC), and motor control servo drives and encoder applications. Connect with half- or full-duplex models and options that include extended temperature, ultralow skew, enhanced drive strength, full fail-safe and hot swap support, low voltage logic interfaces, integrated termination, and extensive EMC protection against IEC surge, EFT, ESD, and overvoltage faults for the design of RS-485 communication links.

Analog Devices offers single, dual, and combination transceivers of up to five RS-232/RS-562 drivers and receivers for 1.8 V to 5.5 V power supplies. Data terminal equipment (DTE) or data communications equipment (DCE) configurations are also available in 3.3 V or 5 V versions. Galvanically isolated modules break ground loops and provide a convenient, self-powered, isolated, low EMI solution that drastically reduces component count and design complexity.

The RS-485 specification meets the requirements for a truly multipoint communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus. Some RS-485 transceivers modify the input impedance to allow up to 8× more nodes to be connected to the same bus. Analog Devices offers a wide range of standard RS-485/RS-422 transceivers and iCoupler® isolated RS-485/RS-422 transceivers to suit many applications.