| USB Adapter Pin | Connect to | 2.5mm Plug | |----------------|------------|-------------| | TX (adapter) | → | Tip (via a 1k–10k resistor? Not required for KT8900, but safe) | | RX (adapter) | ← | Tip (shared same wire) | | GND | ← | Sleeve |

Qyt Kt8900 Programming Cable Pinout Direct

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