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

╰+攻爆jí腚メ 2022-05-23 13:26 204阅读 0赞

### 一，概览： ###

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

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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 ###

![General server response behaviour][]

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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。

![General server response behaviour for request messages with sub-function parameter][]

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未完待续。。。

[General server response behaviour]: /images/20220523/9bf232381524475a8df60acb4647ae88.png
[General server response behaviour for request messages with sub-function parameter]: /images/20220523/61252ca4b9794eb1ab6393c8fff025d1.png