Serial to Stereo cable?

Some devices (such as graphing calculators) use 3.5mm jacks to transmit data. They use similar signals to normal serial ports, but use a different connector.

They are typically used as a pinout for digital cameras.

"since you only really need three lines to do serial communication (and in this case we are not using hardware flow control, which would require two extra lines), a DE-9 to stereo jack is all you need for serial communication with anything with an embedded microprocessor.

The two cases I've used this are a serial programming cable to a TI cable modem, so you could get boot messages and command line access for firmware upgrade purposes; and a OneTouch UltraMini Glucose meter. Here the parent company will sell you an overpriced cable just so you can download your timestamped historic testing data into their ""free"" software app."