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TTL、RS232、RS485电平标准
TTL,RS232,RS485都是一种逻辑电平的表示方式,是串口的三种不同的电平标准。 TTL TTL :全双工 (5V系统,逻辑1: 2.4V–5V 逻辑0: 0V–0.5V)。TTL指双极型三极管逻辑电路,市面上很多“USB转TTL”模块,实际上是“USB转TTL电平的串口”模块。这种信号0对应0V ...
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