For the Version 3 Breakout Board, the DB-25 connector was removed from the board to allow for easier mounting inside a projector. The breakout board will include a ribbon cable from the DB-25 that attaches to the new board. The 2nd ribbon cable is for an optional pass-thru. The screw terminals function similar to the v1 and v2 breakout boards except that the "-" color lines have been removed.
The next item is the interlock lock. This 3rd generation breakout board has a completely redesigned loop circuit. Since every projector should have it's own interlock loop, inter-mixing projectors together with passthru cables create problems with these independent loops. So, the breakout board now features an active loop circuit. The passthru cable interlock loop is competely isolated from the ILDA in cable. If the ILDA in loop comes disconnected from the DAC, the passthru cable interlock loop will also go open and interupt the 2nd projector. This is an optional feature to take advantage of, if you do not wish for the passthru interlock loop to be dependent on projector 1's interlock loop being satisfied, then you can attach a jumper to the "bypass" pin header. This will make projector 1 appear as a DAC to projector 2 since projector 1 cannot interupt the passthru cable interlock loop. Have I lost you yet?! Ok, in order to make this work correctly, your interlock circuitry in your projector must have a common connection to ground, including the breakout board's GND connection (which is basically ILDA pin 25). You then run the + side of your loop thru what ever makes up your loop circuit, cover switches, EPO switches, etc. Then, that + voltage needs to connect to the "L" screw terminal on the breakout board. This will send the +V out on ILDA pin 4 to your DAC, which will return the +V back on pin 17 which is tied to the "LR" screw terminal. If, +V is present on the "LR" screw terminal, this will feed a small LED on the board to show that the interlock loop is satisfied, it will also feed the base of a transistor, which will close a relay to short ILDA pins 4 and 17 together on the passthru cable. So, if properly working and the bypass does not have a jumper, disconnection from your DAC will open both interlock loops.
By default, you will receive a v3 breakout board with jumpers attached to the "invert" pin headers. By swapping the jumpers you can invert the projectors output image. You can also remove the jumpers and wire a DPDT switch to the side of your projector to be able to quickly invert the projector image orientation.