YASKAWA JANCD-MM13B 電氣參數里總結說RS-485電氣驅動能力，在多點網絡拓撲結構下，可驅動32個站點。那么怎么去解讀這一指標呢？ 首先來考察一個站點收發電路特性，收發器的接收電路其標準等效輸入阻抗為12k?,比如MAX 485數據手冊為例：
至于為什么是32個呢？主要是由于前面200mV最小驅動能力的規定。 也可以這樣理解一下，每一個接收電路輸入阻抗并非理想的高阻，而是12k?，那么比如其中一個站點發送，就相當于有32個站點的輸入阻抗并聯，為什么是32個呢？別忘了發送站點自身也有接收電路，所以在不考慮端接電阻以及線路阻抗的情況下，對于發送電路接了一個等效負載：，而發送電路驅動能力肯定是有限的，這樣就好理解了。 下面這個圖就是所謂的多點網絡拓撲，所有的站點都是沿著雙絞線的排布并接在總線上的。
所以，你有可能會在一些地方看到所謂的一個單位RS-485負載的說法，這里所謂的單位負載就是指12k?標準輸入阻抗，這個12k?就是EIA-485標準定義的。從而看到比如單位負載之類的說法，就是源于此處。
數據監控
比如一個基于RS-485的Modbus-RTU多點網絡中，在做協議編程或者實際多站點總線調試的時候，有可能需要監控總線上所有的報文。甚至還有可能就像實現一個總線報文的的記錄器，將總線上所有的報文都記錄下來。應該怎么實現呢？ 買一根USB轉RS-485的轉換線或者自己做一個也可以。將A/B線并接在總線上，USB 插入電腦。使用串口監控終端或者自己寫一個串口接收小軟件，就可以監控所有總線上的報文了。 比如這個AccessPort串口工具就比較好用：
應用設計
作為應用設計而言，需要考慮這些維度：
端接設計
接口芯片
隔離設計
端接設計
首先為什么要端接？這是由于RS-485采用雙絞線傳輸，標準規定的雙絞線的差分特征阻抗在100Ω至150Ω之間。RS-485標準制定者選擇120Ω作為標稱特征阻抗。
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4周
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