ARINC Specification 485P2-3:2013

ARINC Specification 485, Part 2 specifies the ARINC 485-control protocol used by the LRUs described in ARINC Specification 628 Part 2. This document defines a multi-drop bus. The point-to-point configuration is also supported. The point-to-point bus is treated simply as a multi-drop bus with only one drop. There is one master LRU and one or more slave LRUs present on the bus. However, multiple buses may be connected in parallel, where each parallel bus operates independently from each other.