串口RS232 和RS485 是两种不同的串行通信接口标准，它们有以下几方面的区别： RS232 接口通常以 9 个引脚 (DB9) 或 25 个引脚 (DB25) 的形式出现，而 RS485 接口没有具体的物理形状，可以根据实际情况采用不同的接口。

A simple converter can be sourced online, but the only thing he could find locally that was even close was a USB to RS-232 converter. He used that component to craft his own USB to RS-485 bridge.

The supply of still-reliable RS232 mice must therefore be dwindling ... maybe you can make use of a USB to quadrature converter.