Qyt Kt8900 Programming: Cable Pinout Top

QYT KT-8900 3.5 mm "DATA" jack located on the rear panel of the radio for programming

Ground (GND)

The KT-8900 uses a standard Serial-to-TTL (3.3V or 5V) interface. While the port often accepts a 4-contact (TRRS) plug, it typically only uses three contacts: , Transmit (TX) , and Receive (RX) . Plug Contact Description Tip RX Data coming into the radio from the PC Ring 1 TX Data going out of the radio to the PC Sleeve GND Common ground for the circuit qyt kt8900 programming cable pinout top

1. Get a 3.5mm and 2.5mm male plug.
2. Connect both sleeves together → to USB TTL GND.
3. 3.5mm tip → USB TTL RX.
4. 2.5mm tip → USB TTL TX.
5. Do not connect the ring terminals.

Interface Type:

It is a USB-to-TTL serial interface. If you are building your own, you can use a common UART module like the CP2102 . QYT KT-8900 3