RS485通讯背景:上图上拉下拉电阻是为了在空闲状态,AB间保持一个固定1输出的状态.在接120终端电阻的时候,根据分压原理:U终端=120/(3300+3300+120)*5=0.08左右,即没有保证>=0.2v的压降了?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 23:22:14
![RS485通讯背景:上图上拉下拉电阻是为了在空闲状态,AB间保持一个固定1输出的状态.在接120终端电阻的时候,根据分压原理:U终端=120/(3300+3300+120)*5=0.08左右,即没有保证>=0.2v的压降了?](/uploads/image/z/10986497-17-7.jpg?t=RS485%E9%80%9A%E8%AE%AF%E8%83%8C%E6%99%AF%EF%BC%9A%E4%B8%8A%E5%9B%BE%E4%B8%8A%E6%8B%89%E4%B8%8B%E6%8B%89%E7%94%B5%E9%98%BB%E6%98%AF%E4%B8%BA%E4%BA%86%E5%9C%A8%E7%A9%BA%E9%97%B2%E7%8A%B6%E6%80%81%2CAB%E9%97%B4%E4%BF%9D%E6%8C%81%E4%B8%80%E4%B8%AA%E5%9B%BA%E5%AE%9A1%E8%BE%93%E5%87%BA%E7%9A%84%E7%8A%B6%E6%80%81.%E5%9C%A8%E6%8E%A5120%E7%BB%88%E7%AB%AF%E7%94%B5%E9%98%BB%E7%9A%84%E6%97%B6%E5%80%99%2C%E6%A0%B9%E6%8D%AE%E5%88%86%E5%8E%8B%E5%8E%9F%E7%90%86%EF%BC%9AU%E7%BB%88%E7%AB%AF%3D120%2F%283300%2B3300%2B120%29%2A5%3D0.08%E5%B7%A6%E5%8F%B3%2C%E5%8D%B3%E6%B2%A1%E6%9C%89%E4%BF%9D%E8%AF%81%26gt%3B%3D0.2v%E7%9A%84%E5%8E%8B%E9%99%8D%E4%BA%86%3F)
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