這部分掃描是用來處理來自任選智能模塊(例如PCM)的通訊請求(見流程圖)。掃描按照“先來先掃描”的原則服務(wù)于請求。然而,由于智能任選模塊是按照循環(huán)方式通訊的,沒有一個智能任選模塊具有超越任一其它智能任選模塊的優(yōu)先權(quán)。在缺省RUN-TO-Completion方式下,系統(tǒng)通訊窗口的長度限定為50ms。如果一智能任選模塊發(fā)出的請求處理超過50ms時，則請求處理將經(jīng)過多次掃描,于是,沒有一次掃描會因大于50ms而被壓縮。

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