Many older or inexpensive cables use "counterfeit" Prolific PL2303 chips that are no longer supported by modern Windows 11 drivers. For the best experience, it is highly recommended to use a cable with an
: TXD (Transmit Data) — Sends data out from the radio to the PC.
Think of the plug's metal sections as separate "channels": qyt kt8900 programming cable pinout top
: Most commercial cables utilize the Prolific or CH340 chipsets.
A very specific request!
Ensure that your software is pointed to the exact COM port assigned to your USB serial device. You can verify this number via the Windows Device Manager under "Ports (COM & LPT)".
You have a mirrored pinout. Flipping the plug swaps pins 1 and 8. That means your cable is wired opposite: Pin 8 is GND. This is non-standard; re-crimp properly. Many older or inexpensive cables use "counterfeit" Prolific
The KT-8900 follows a non-standard (but common among Chinese mobile radios) serial TTL logic. This is NOT a standard RS-232 cable. It uses TTL levels (0-5V) , so a simple USB-to-serial adapter with a MAX232 chip will NOT work. You need a USB-to-TTL adapter (e.g., using a CP2102, CH340, or FTDI chip).
Note: In serial communications, the Transmit (TXD) pin of your USB adapter always crosses over to connect with the Receive (RXD) terminal of the target device. Software and Driver Configuration A very specific request
To program the KT-8900, you'll need to install the official programming software, such as QYT's own software or third-party tools like CPS (Chinese Programming Software). Ensure you download the software and drivers from a trusted source. Install the software and drivers according to the manufacturer's instructions.
To interface this radio with a computer, you cannot use a straight-through audio cable. You must use a USB-to-TTL serial adapter module (such as an FTDI, CP2102, or CH340 chip) that operates at . The serial adapter translates the computer's USB signals into the asynchronous serial data that the radio's microprocessor understands. Exact Pinout Configuration