If building a cable, a CP2102 or CH340 based USB-to-TTL module is recommended for modern operating systems like Windows 10/11.
: Use a USB-to-TTL converter (like those with CP2102 or FTDI chips). Do not connect directly to a computer's RS-232 COM port without a level shifter, as the ±12V levels can damage the radio. Driver Issues qyt kt8900 programming cable pinout top
For this guide, we will follow the industry standard: Pin 1 is on the left side . If building a cable, a CP2102 or CH340