Device Names
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Each ECU that actively participates in J1939 communication (i.e. sending) requires a unique name. This is composed of a stream of 64 bits. Within the standard the device name is defined as NAME. It contains information that identifies and instantiates the device and describes the origin and function of the device. By means of the device name, an ECU can be identified uniquely worldwide and be described as a unique ECU. In addition, the device name is used to prioritize the ECU during dynamic address assignment (see chapter Network Management).

The J1939 NAME is composed as shown in figure “64-bit ECU Name Fields”.