Editing Local Interconnect Network (section)

==== BSM auto-addressing procedure ====
At the start of the procedure, none of the SNPD devices have a NAD assigned. The autoaddressing routine is performed during the sync field. The sync field is broken into three phases:

1 Offset current measurement
:1.1 All outputs pull-ups and current sources are switched off
:1.2 The bus current is measured, '''I<sub>offset</sub>'''
2 Pull-up mode
:2.1 Pull-ups are turned on and current sources remain off
:2.2 The bus current is measured, '''I<sub>PU</sub>'''
:2.3 Nodes with ΔI = '''I<sub>PU</sub>'''-'''I<sub>offset</sub>''' < 1&nbsp;mA are "selected"
3 Current source mode
:3.1 Selected nodes switch current source on and others switch pull-ups off
:3.2 Bus current is measured, '''I<sub>CS</sub>'''
:3.3 Node with ΔI = '''I<sub>CS</sub>'''-'''I<sub>offset</sub>''' < 1&nbsp;mA is detected as the last node
:3.4 Current sources are switched off and pull-ups are switched on
:3.5 The last node will accept the address contained in the LIN configuration message

This technique is covered by the patents EP 1490772 B1 and US 7091876.