Yes, I agree with you. I think it is my mistake for overlooking the power-on LED flashing count. The LEDs flash only once when it powers-on at first time, so the serial baud rate is 2000000bps by default. I should set the baud rate to 2Mbps accordingly.
When I changed it to 15200bps, the LED flash 3 times when it is power-up. Now I am working with this baud rate. As I use this USB-CAN converter more times and read the 1st document, I realized the LED things. And every time I change the settings, the red LED will flash once, I believe this is the sign of successful setting change.
The converter and the software actually works well. I also use it for normal communication.
Thanks PJ.
Kevin