Qyt Kt8900 Programming Cable Pinout Top Direct
Solder the to the GND pad on your USB-TTL adapter. Solder the Tip wire to the TXD pad on the board. Solder the Ring wire to the RXD pad on the board.
Solder a wire from the of the plug to the RXD (Receive) pin on the board.
| Radio Side (3.5mm Plug) | Signal | USB-to-TTL Adapter Side (e.g., CP2102) | Wire Color (Common) | | :--- | :--- | :--- | :--- | | Tip | RXD (Receive Data) | TXD (Transmit Data) | Red (or Yellow) | | Ring | TXD (Transmit Data) | RXD (Receive Data) | White (or Green) | | Sleeve | GND (Ground) | GND | Black |
Unscrew the plastic shield of the 3.5mm plug and slide it onto your cable wire before soldering. qyt kt8900 programming cable pinout top
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For further information on the QYT KT8900 programming cable pinout and radio settings, here are some additional resources:
📌 TXD (Transmit Data) -> Connects to the RXD pin of your USB-to-TTL adapter. Solder the to the GND pad on your USB-TTL adapter
Fine-tip soldering iron, solder wire, and heat-shrink tubing. 2. Cross-Wiring Diagram
Connects to the GND pin of your USB-to-TTL serial adapter board.
📌 RXD (Receive Data) -> Connects to the TXD pin of your USB-to-TTL adapter. Solder a wire from the of the plug
Once you have a functioning cable, you must ensure your computer can communicate with it.
| Pin # | Signal | Wire Color (typical in pre-made cables) | |-------|--------|------------------------------------------| | 1 | NC | (Not connected) | | 2 | +5V | Red | | 3 | GND | Black | | 4 | TX (Radio transmit → PC receive) | Green | | 5 | RX (PC transmit → Radio receive) | White | | 6 | GND | Black (sometimes bridged with pin 3) | | 7 | Audio out to radio (speaker) | Yellow | | 8 | PTT / Mic ground | Brown |
⚠️ Pin 1 is on the left when the clip (latch) is facing up and you are looking at the contact pins of the plug.
Solder a wire from the lug of the plug to the GND pin on your USB-TTL adapter.
To build your own programming cable, you'll need: