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4.6 服务请求接口功能(SR)1)SR功能赋予器件这样的能力:请求从接口的负责控者那里得到异步服务。SR功能还能对串行点名时出现的复合状态拜特的RQS消息内容进行同步,从而在负荷控者一旦收到RQS消息真值时能从接口撤除SRQ消息(见§4.11)。2)SR功能应这样来建立,使之能按照图4.6.1的状态图以及本节的各种规定来行事。表4.6.1(XVIII)规定了全部有关的消息、状态
4.6 Service Request Interface Function (SR) 1) The SR function gives the device the ability to request an asynchronous service from the responsible controller of the interface. The SR function can also synchronize the contents of the Bezs’ RQS messages appearing at serial point names so that SRQ messages can be removed from the interface as soon as the load controller receives the RQS message (see §4.11). 2) The SR function should be set up so that it can act according to the state diagram in Figure 4.6.1 and the various provisions of this section. Table 4.6.1 (XVIII) provides all relevant information, status