ILDA Wiring newbie question

[Tranc3r]

Building a green projector with laserwave, DT-30 and mamba black and dont know anything...hehe.

Is it supposed to be like this:

+- x scanner ---> pin 1/14
+- y scanner ---> pin 2/15
+-analog mod laser ----> pin 3/16
interlock looped pin 4/17

On medialas homepage it says pin 3 0-2,5v. If connect pin 16 to ground pin 3 0-5v. Am I supposed to connect a wire between pin 16 to pin 25 or I will only get half power with analog modulation?
Pin 25 isnt really grounded since my comp or dac will never be connected to ground from that end....

http://www.medialas.de/data/USB-Box.pdf

Ground cables are confusing. Sofar I only have the chassi grounded from the mains. Comp or dac are not grounded from that end.

Am I supposed to just ground laser psu, scanner psu, and both scanner amps to the mains ground. Supposed to ground pin 25 too since its not grounded from the other end?

[Doc]

The wordings are misleading. Pin 25 can be considered 0v reference as far as signals from your DAC are concerned. In other words; pin 25 is the signal common connection.

I don't own a Medialase DAC but it sounds like it has balanced (differential) outputs for the colour channels; therefore grounding pin 16 (better described as tying to pin 25 DAC common) will cause it's corresponding signal pair (Pin 3) to swing from 0 > 5v.