瑞米派上的UART是TTL电平，需要使用TTL转RS485模块，才能在后续的实验里连接modbus模块。 RS485协议是半双工的：用一时间要么用于发送数据，要么用于接收数据。怎么决定是发送数据还是接收数据？有2种方法：手工指定方向，自动切换方向。 手工指定方向的TTL转 ...

RS485是一个定义平衡数字多点系统中的驱动器和接收器的电气特性的标准，该标准由电信行业协会和电子工业联盟定义。使用该标准的数字通信网络能在远距离条件下以及电子噪声大的环境下有效传输信号。RS-485使得廉价本地网络以及多支路通信链路的配置成为 ...

Out of all the laptop upgrade options typically available, you wouldn’t expect this specific one. [controlmypad] decided to take a part of his RS485 device programming workflow and put it inside of a ...

If you have been patiently waiting for Ali Slim to make the new Ollie isolated, multifunction interface module and USB to isolated UART, CAN, RS485, RS232 to launch. You will be pleased to know that ...