D形連接器的插座與總線站相聯(lián)接,而它的插頭與總線電纜相聯(lián)接。
根據(jù)EIA RS 485標(biāo)準(zhǔn),在數(shù)據(jù)線A和B的兩端均加接總線終端器。PROFIBUS的總線終端器包含一個下拉電阻和一個上拉電阻。當(dāng)在總線上沒有站發(fā)送數(shù)據(jù)時,也就是說在兩個報文之間總線處于空閑狀態(tài)時,這兩個電阻確保在總線上有一個確定的空閑電位。必須為終端電阻供電以使其作用。原理如下圖:
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