Ever notice that each new FT232 inserted into each USB port is assigned a unique COM port number under Windows? When we’re developing hardware with lots of prototypes flying around Windows quickly hits COM 100. Each FT232 has a unique serial number and the driver creates a new COM port for each by default.
FTDI has a quick knowledge base item about editing a registry key to disable this and stick with a single COM number.
“For a default FTDI device ID (VID 0x0403, PID 0x6001), add the following registry REG_BINARY value set to 01:
It’s not difficult to do, but it is impossible to find with Bing* so we’re posting it here for reference.
*Bing is the most reachable English search engine in China at the moment, though reachable doesn’t infer quality search results.