Hi Walter, I am Martin from Argentina. First apologies for my english.
I bought a 6442S from china, I am waiting for the controller, and in this time I investigate all that I can about this controller, download you the manual from ruida site ?
http://en.rd-acs.com/Private/Files/a4d9f12fe9e32eb7.pdf There are a few thing more, but no a lot more
And the Rdworks manual from the same site :
http://en.rd-acs.com/Private/Files/2903becbd6191eab.rar
I´d like to do a retrofit to my goldenlaser (2 fixed head, 80w and 50 w). Sadly, I just waiting, but when the 6442S arrive, I will try z control, U (rotary) options, etc
In one of this manuals they tell about a password to reset the display... "123456" may be you try this.
If you discover something, please tell about, and thanks
Martin.-