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ISO15031支持的汽车OBD口读取的数据项：
其中服务ID，即SID。还有具体一类参数的参数ID，即PID
本篇文章主要从以下几个方面进行讲解
1.OBD用来做什么
2.OBD和UDS的区别
3.OBD硬件接口简介
4.OBD的9大模式介绍
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网络层的国际标准是ISO 15756-2，该标准详细规定了协议的具体细节。CAN总线是一帧8个字节，该协议可以使CAN总线高效的传输大约8个字节（up to 4095 bytes）的命令和数据。基于该标准文档，我开发出了一个独立性良好的协议栈，工作在上层诊断协议之下和下层CAN驱动之上，下面详解开发协议栈时需要实现的部分（基于 ISO 15765-2:2004（E））
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This CAN Specification consists of two parts, with
• Part A describing the CAN message format as it is defined in CAN Specification 1.2;
• Part B describing both standard and extended message formats.
In order to be compatible with this CAN Specification 2.0 it is required that a CAN
implementation be compatible with either Part A or Part B.
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ISO 11898-1-2003 Road vehicles——Controller area network(CAN)
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