I had to relocate the pendant on a Haas GR-510 cnc gantry mill, which required extending 4 cables, one of them a 26-pin DFP cable, an apparently old-style video cable. A pic of the control display is here:
The cable I purchased is here, notably thicker (and longer -- 35 ft vs.10-15 ft) than the original,
and the oem mfr is this company: (the E164618 cable, "power limited circuit cable", type CL2):
The display quality is substantially degraded, with shadows and color-bleeding like what you'd see on an old color TV with poor antenna reception. However, some areas/background colors of the screen are much better than others. Irksome, but still usable, and the placement of pendant is more important than the screen quality, so I'll have to deal with it, but I'm wondering if there is a solution. We seated/re-seated the cable, reversed ends, ran it away from AC wiring, etc, no real change.
Is this to be expected in simply lengthening a video cable? Does the signal need boosting? A problem if a booster does not have dfp connectors. Could shielding be a problem? If so, could I make my own shielding, with alum foil? Both ends grounded?? Is the cable poss. defective?? I'd think a defective cable would simply just not work at all!
Also, could I be harming the display? LCD type, it seems.
These cables are hard to find, and the oem mfr hasn't responded, and probably won't (china). I was hoping for a longer cable from them, or a female-female adatpter (coupler), and another duplicate cable.
Options? Haas proper appears not to be a useful resource.... they have difficulty dealing with SIMPLE problems!!