Most posters seem to go for a two part solution. DB9 to USB serial converters are common. Then people buy or build a 3.5mm jack to DB9 section.
The converter I use is:
Sergey has a good description on his blog:
Most posters seem to go for a two part solution. DB9 to USB serial converters are common. Then people buy or build a 3.5mm jack to DB9 section.
The converter I use is:
Sergey has a good description on his blog: