LG RZ30LZ13 serial port service commands

[lz1cam]

Hello, I bought my new LG 30LZ13 and was pleased to communicated via the RS232, but the only settings I could make are the identical ones foreseen by the remote control. Is there anybody able to provide me with a more extended set of service tuning commands? For example I'm suffering from the night watching dark levels as they are not dark but a shade of grey. Must probably I need to lower the high level brightness of the screen lamp.
Any suggestions are welcome as I'm really unhappy with this issue.