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ISO 15765-2协议-寻址方式
网络层数据的交换支持三种寻址方式：
1.Normal addressing
2.Extended addressing
3.Mixed addressing
每一种寻址格式都需要不同数量的CAN帧数据字节来封装与要交换的数据相关的寻址信息。用户对于单个CAN帧内传输的数据字节数取决于所选寻址格式的类型。
Network Iayer interface and Standardized diagnostic CAN identifiers from 15765-3
8.Standardized diagnostic CAN identifiers
Mapping of the N_PDU fields - from ISO15765-2
Addressing formats
The exchange of network layer data is supported by three addressing formats: normal, extended and mixed addressing. Each addressing format requires a different number of CAN frame data bytes to encapsulate the addressing information associated with the data to be exchanged. Consequently, the number of data bytes transported within a single CAN frame depends on the type of addressing format chosen.
The following (7.3.2 to 7.3.5) specifies the mapping mechanisms for each addressing format, based on the data link layer services and service parameters defined in ISO 11898-1.
ISO 15765-2
Road vehicles — Diagnostics on Controller Area Networks (CAN) —
Part 2:Network layer services : ISO 15765-2:2004(E)