Hi gary
Yes the controller itself is working fine, but I need to change some parameters (motor brake, speed cruise and so on).
OK so if I need to connect unpowered, then I think the 16x blinking of the red led on the controller means "programming mode".
This programming mode is entered at the controller, if the supply wires black and red are connected, the TxD and RxD (green and yellow) are not necessary for entering the programming mode.
So I think that there is a problem with the green and yellow wire inside the USB-connector.
I already have written with GoldenMotor in China about this problem, but I don't get any answer from them.
The support of GoldenMotor in China is not very good, I also don't get an answer on my question "What is the purpose of the high brake signal?".
The only answer was "Don't care".
Wolfgang