This SAE Information Report SAE J2931 establishes the requirements for digital communication between Plug-in Vehicles (PEV), the Electric Vehicle Supply Equipment (EVSE) and the utility or service provider, Energy Services Interface (ESI), Advanced Metering Infrastructure (AMI) and Home Area Network (HAN).

This is the second version of this document and completes the step 2 effort that specifies the digital communication protocol stack between Plug-in Electric Vehicles (PEV) and the Electric Vehicle Supply Equipment (EVSE). The purpose of the stack outlined in Figure 1 and defined by layers 3 to 6 of the OSI Reference Model is to use the functions of Layers 1 and 2 specified in SAE J 2931/4 and export eht functionalities to Layer 7 as specified in SAE J 2847/2 (as of August 1, 2012, revision) and SAE J 2847/1 (targeting revision at the end of 2012).