Awl --
This is Round 2 of trying to get the screen of that re-located Haas controller to work right (previous thread CNC display problem...). The extension cable is sort of ok, but iyr, the 35 ft replacement DFP cable really degraded the screen image. Usable, but irksome.
So I ordered DFP to DVI adapters for each board, and figgered I run a DVI cable in between, since they are readily available.
No go. The screen displays NO DATA whatsoever, just full-screen blinking solid colors.
On a lark, I started ohming stuff out. The original haas 13 ft dfp cable ohms out at 0.8 ohms (0.4 on the shield). The 35 ft replacement dfp ohms out at 2.1 (0.3 on the ground).
So the ohm diffs on the dfp cables would explain some of the screen problems, I imagine.
Here's where it gets inneresting.
The DVI cables (the 25' I bought, one I have laying around), well, ohms is more-or-less moot: Half the pins aren't even connected!!!! And the pattern is different between the two DVI's I have!!! Of the ones that did ohm out, the 6 ft cable measured a reasonable 0.3 ohms, while the 25 footer measured a whopping 4.5 ohms!!! DOUBLE the 35 ft dfp cable. I'm surprised the screen even showed colors!!
So my basic Q is: Can I get a DVI cable with ALL 24 pins connected?? Which is a minor problem in itself, as the DFP is 26 pin, so I have to hope that I luck out, connection-wise. I'm pretty sure not all 26 dfp pins are actually utilized, but the unanswerable Q for me is, Which ones?
Ultimately, I may just get a second dfp cable -- or two -- from Haas, and splice them together. Is this actually a better solution than muckymucking around with dvi-dfp adapters, and dicey dvi cables?
I would like to use a fem-fem dfp coupler so I wouldn't have to splice the dfp, but I can't find any online and I don't know much about the type of fem connectors used on the board so I could make a coupler, but I don't know what to search on, or if I'll be able to find those. What would I search on?
Never a dull moment.