The uses a 3.5mm jack for programming, typically located at the rear of the radio labeled as DATA . While the port can accept a 4-contact (TRRS) plug, only three connections are required for programming, allowing the use of a standard 3.5mm stereo (TRS) plug. 3.5mm Programming Jack Pinout
| Radio Model | Microphone Pinout | Programming Pins | | :---: | :---: | :---: | | Baofeng UV-5R (Kenwood style) | 2.5mm + 3.5mm jacks | Tip/Ring/Sleeve (different) | | QYT KT-8900 | RJ-45 (8P8C) | | | TYT TH-9800 | RJ-45 | Pins 2 (TXD), 5 (GND), 3 (RXD) | qyt kt8900 programming cable pinout top