The RS-422 and RS-485 interfaces are the most common standards used in modern industrial data communication systems. Most of the well-known fieldbuses like Profibus and Interbus use RS-485 as their electrical standard. RS-422 and RS-485 have the advantage that they can be used at very high data rates, for example Profibus can handle rates up to 12 Mbit/s. All Westermo RS-422/485 converters or repeaters can be used in systems that correspond to these standards.

The repeaters can handle data rates up to 1.5 Mbit/s but the converters are limited by the RS-232/V.24 interface to a maximum data rate of 115.2 kbit/s The Westermo RS-422/485 product range can be used for 2- or 4-wire and both in point to point or in bus type systems.