A resistor is connected between each line and + 5v, so the idle state of the bus is high.

在+5V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。

youdao

A resistor is connected between each line and + 5v, so the idle state of the bus is high.

在+5V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。

youdao