IS 350 V6-3.5L (2GR-FSE) (2006)
Information Bus: Description and Operation
Multiplex Communication System
SYSTEM DESCRIPTION
1. MULTIPLEX COMMUNICATION SYSTEM BASICS
a. The LEXUS IS250/350 Multiplex Communication System (MPX) uses serial communication, which converts multiple pieces of information
into serial communication data. As a result, they can be transmitted through a single communication wire.
b. Serial communication data consists of bits and frames. A bit is a basic unit of information represented by the binary values "0" and "1". The
amount of information is represented by the number of bits. A frame is a group of bits. A frame contains a "header" that indicates the
beginning of the frame and an "end message" that indicates the end of the frame.