UDS 服务器响应实施规则（Server response implementation rules） 未完待续。。。

一，概览：

Abbreviation	Description
suppressPosRspMsgIndicationBit	TRUE = server shall NOT send a positive response message (exception see Annex A.1 in definition of NRC 0x78) FALSE = server shall send a positive or negative response message
PosRsp	Abbreviation for positive response message
NegRsp	Abbreviation for negative response message
NoRsp	Abbreviation for NOT sending a positive or negative response meesage
NRC	Abbreviation for negative response code
ALL	All of the requested data-parameters of the client request message are supported by the server
At least 1	At least 1 data-parameter of the client request message must be supported by the server
None	None of the requested data-parameter of the client request message is supported by the server

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1. 服务器会响应它支持的诊断服务，而不管是什么地址模式（物理地址还是功能地址）；

2. 根据以下子项表的要求，当功能寻址消息的消极响应消息中具有SNS (serviceNotSupported), SNSIAS (serviceNotSupportedInActiveSession), SFNS (sub-functionNotSupported), SFNSIAS (sub-functionNotSupportedInActiveSession), and ROOR (requestOutOfRange) 等消极响应码时，此消极响应消息将不会发送（NRC0x78定义中的附件A.1）不应发送。（例外见附件A.1中NRC 0x78的定义）。

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二，服务器响应流程图

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三，带子功能参数的请求消息的服务器响应流程图

服务器会检查最小长度（最小为2，SID+SubFunction Parameter）,该子功能是否适用于此SID等等。

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未完待续。。。