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有的USB接口會多出一根ID線，以支持OTG（On The Go）。支持OTG的線兩端是不一樣的，其中一端插到OTG設備時會把設備接口的識別引腳ID拉低，此設備識別到自己的ID拉低后會進入主機狀態（Host），連線另一端的設備ID沒有拉低，默認進入設備狀態（Device）。之后通過軟協議可以主從切換。但是集中這種應用不是太多，一臺設備要么作主機，要么作設備的情況比較多。
USB使用的是差分傳輸模式，有兩根數據線D+和D-。
Differential 1：D+ 》 VOH（min） （2.8V） 且D- 《 VOL（max）（0.3V）
Differential 0：D- 》 VOH and D+ 《 VOL
J狀態：對于低速USB是Differential 0，對于全速USB是 Differential 1
K狀態：對于低速USB是Differential 1，對于全速USB是 Differential 0
除此之外，通過把D+，D-當作單端信號拉低，拉高，可以表示一些特殊的狀態。
SE0狀態（Single Ended 0）：D+ 低，D- 低
SE1狀態（Single Ended 1）：D+ 高，D- 高
Reset信號：D+ and D- 《 VOL for 》= 10ms
主機在要和設備通信之前會發送Reset信號來把設備設置到默認的未配置狀態。即主機拉低兩根信號線（SE0狀態）并保持10ms。
看到這里也許有點暈，不過沒關系，你如果看USB協議會更暈。
我們千萬不要掉進這個坑里出不來，就像我們用串口也從來不會去觸發一個起始信號，或者拉出一個結束信號一樣，這些物理層信號狀態的處理完全由芯片集成的USB控制器來處理。而且提供USB軟件協議棧也是必須的，靠用戶自己完全把所有細節搞清楚是不現實的。然而就像開車一樣，你如果對汽車的原理有更深入的了解，一定更能充分的發揮出這輛車的性能。
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