EIA-232、EIA-485与TTL电平

原創

2020-07-06 01:41

EIA-232、EIA-485与TTL电平的区别

	EIA-485	EIA-232	TTL电平
多址模式	多点通信	点对点通信	点对点通信
双工模式	半双工	全双工	全双工
抗干扰能力	强	中	弱
通信距离	远	中	近
实现成本	高	高	低
占用PCB面积	大	中	小
接插件	无规定	DB9或DB25	无规定
信号电平	A（＋）负逻辑	逻辑0：（带载）＋3～＋15V	逻辑0：0V
信号电平	A（－）正逻辑	逻辑1：（带载）－ 3～－15V	逻辑1：5V
最简异步接口	A线，B线	TXD,RXD,GND	TXD,RXD,GND

MAX232实现EIA232与TTL电平转换

分立元件实现EIA232与TTL电平转换

MAX485实现EIA485与TTL电平转换

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