xuos-web/docs/doc/hardware/connector/rs485.md

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# RS485
## 模块介绍
### MAX485
<center>
![485](./imagesrc/485.png)
</center>
MAX485是用于RS-485通信的低功耗收发器器件中具有一个驱动器和一个接收器。MAX485的驱动器摆率不受限制可以实现最高2.5Mbps的传输速率。收发器在驱动器禁用的空载或满载状态下吸取的电源电流在120μA至500μA之间。驱动器具有短路电流限制并可以通过热关断电路将驱动器输出置为高阻状态防止过度的功率损耗。接收器输入具有失效保护特性当输入开路时可以确保逻辑高电平输出。MAX485为半双工应用设计。
## 模块引脚定义如下
<center>
![485-pin](./imagesrc/485-pin.png)
</center>