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IEEE 1284 DB25 Wiring
Grasshopper:
I had a similar problem when I bought some 36pin to 36pin Centronics cables to connect my panel to my Ipac (I prefer Centronics connectors to DB25 as they are sturdier).
They were made by Belkin which is supposed to be a good brand. From my research I expected at least 25 separate connections but the cable only had about 18 or 19 (I can't remember the exact number). All the ground connections were joined together which, strictly speaking, contravenes the Centronics standard.
The only safe way to avoid this problem is to buy from companies that provide pinouts. I'd recommend Farnell for this (www.farnell.com). If a company won't provide pinouts then walk away. It's not worth the risk.