4.1 Bus Layout
The LIN protocol specifies a bus with no more than 16 nodes: one master and up to 15 slaves. Communication is over a single shared line, terminated through a pull-up resistor and diode to the primary VBAT/VSUP. LIN is message-based with different message IDs in the header of the master process, indicating which nodes will be transmitting/receiving data during the slave process. Bit rates of LIN communications are specified to be between 1 kbps and 20 kbps.