I’m working on a fingerprint sensor that is known as FPM383. It is much like the well known R503 sensor. Their datasheet and serial communication manual are almost identical.
https://www.hlktech.net/index.php?id=1200&cateid=761
I was trying to control sensor module from a MCU like ESP32 and got it working well. But I also have found a test software for the module that runs under windows: