Loopback test: Short TXD and RXD pins (pins 2 and 3 on DB9). Typing characters should echo back.
: This is the most common manufacturer for this model. You can find official drivers on the MCT Download Page . Prolific Chipset : Some variations of the u232 p9 driver windows 10
Depending on your specific hardware revision, you will likely need the drivers from the manufacturer . Loopback test: Short TXD and RXD pins (pins 2 and 3 on DB9)