Interface

Cross Reference

Application Notes

Training

Tools & Software

Block Diagrams

WEBENCH® Design Center

The RS-485 Unit Load and Maximum Number of Bus Connections

 1,270 views

The TIA/EIA-485 (RS-485) standard defines a Unit Load and confines bus configurations to 32. This report explains the Unit-Load concept and how it relates to the maximum number of bus connections. Fractional Unit-Load devices, such at the 1/8th Unit-Load SN65HVD21 and SN65HVD06, allow up to 256 devices on a single bus segment.