这个是我画的USB转RS232串口的原理图PCB -This is my painting USB to RS232 serial PCB schematic

The SC-2075 is a desktop signal conditioner that you can connect directly to National Instruments E Series or 1200 Series devices. The SC-2075 has the following features: • Binding posts – Three for ±15 V outputs – Two for 0 to 5 V out

实物调试，labview通过usb转ttl电平控制AVR单片机，实现串口测试：发送hello字符返回ok！读取单片机I/0口，更改数码管显示等功能。-Physical debugging, labview through usb to TTL level control AVR microcontroller, realize serial testing: send hello character return ok! Read the microcontroller I/0 interfac