本協議遵循CAN2.0B規范，根據車身控制模塊的特點，采用源→目的方法，每個節點都有自己固定的標識地址，且節點數小于64，設計時可將中央控制模塊設為主節點，而將車門、電動座椅子模塊及自檢子模塊設置為從節點。本協議可完成以下功能：
（1）特定信息的廣播；
（2）主從節點之間的連接；
（3）主從節點之間的信息交換（包括故障信息）。
本協議采用幀優先原則分配標識符，每一幀標識符中的高四位表示幀類型，不同幀類型有不同的優先權，優先權決定了各種信息幀在同等情況下的發送順序，協議中的29位標識符的分配如下：
幀類型（4位）＋目的地址（6位）＋源地址（6位）＋命令（或狀態、報告）屬性（13位）［或數據屬性＋分段標志＋分段號（共13位）］。
對所有的命令或狀態、數據、報告屬性、除定時采集發送的數據外，原則上均需應答（發送確認幀以保證通訊正常）。
幀格式仲裁場和控制場定義
仲裁場由29位標識符ID28－ID0以及SRR、IDE和RTR組成，SJA1000中的寄存器17－21用來存放擴展幀格式幀信息的標識符。發送時，SRR＝1，IDE＝1，RTR＝1/0（遠程幀/數據幀）。標識符中的ID28－ID25為車身控制模塊交換報文的幀類型（共4位）。ID24－ID19為車身控制模塊中幀信息使用者的地址（或稱為目的地址，共6位）。ID18－ID13為車身控制模塊中幀信息發送者的地址或稱為源地址（共6位）。ID12－ID5為車身控制模塊中交換的命令、狀態、數據或報告屬性（共8位），ID4位需附加命令或狀態、數據、報告屬性時的分段標志。ID3－ID0為附加命令或狀態、數據、報告屬性的分段號（共4位）。當ID4＝0時，ID3－ID0控制場、數據寄存器0－7有效。對于遠程幀，則可忽略ID4－ID0以及控制場的值。SJA1000的寄存器16低四位DLC3－DLC0可構成控制場，以決定數據幀的數據長度。
車身控制模塊CAN2.0B通訊報文約定
按車身控制模塊的節點要求，通訊的信息幀分為表1所列的6種，表1中的優先級按序號從高到低排列。其目的地址和源地址的分配見表2所列。
其工作方式如下：
（1）開機后或喚醒時，從節點向主節點發送狀態信息，主節點發送廣播信息遠程幀（兩次），廣播信息為共用信息，包括車速信號，檔位信號，點火開關位置信號等。
（2）正常情況下，從節點內部各端口狀態，如有故障則向主節點發送故障代碼3次，主節點收到三次故障報警后開始響應，從節點停止發送，一旦故障消失，再向主節點發送正常信息。在主節點中應有一故障表，以用于已診斷模塊的通訊。
（3）主結點分別發送自檢信息后，如各從節點正常，則發送正常信息，狀態和數據幀。如有故障，則通過分段數據幀發送故障報警幀。
（4）從節點監測到正常輸入信號的變化（包括開關量和模擬量采樣級數的變化）后，便通過報告幀發送信息給主節點，主節點則發送命令幀以示響應。
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