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Sometimes carries low voltage; do not connect to avoid shorts. GND (Ground) GND (Ground) The common ground reference for data signals. Visualizing the 3.5mm TRRS Plug qyt kt8900 programming cable pinout top
If you are recycling an old USB-to-TTL adapter board or repairing an existing cable, use the following wiring scheme to connect your module to the 3.5mm TRRS connector: USB-to-TTL Module Pin 3.5mm TRRS Component (Transmit) Tip Carries data to the radio's RX circuit RXD (Receive) Ring 1 Carries data from the radio's TX circuit GND (Ground) Sleeve Common ground reference This public link is valid for 7 days
Snip off the twin-prong Baofeng connector. Can’t copy the link right now
Never connect standard RS-232 serial cable lines (which operate at ±12V) directly to these pins. The QYT KT-8900
Use a cable with an FTDI chip if possible; they are far more reliable and better supported on Windows 10/11 than older Prolific (PL2303) clones.