A quick warning to those who are about to wire up any gecko G250s.

There are some wiring diagrams out in circulation (official gecko diagrams) which show the wrong pinout on pins 26 and 28. Using these diagrams will kill your stepper cards, I have killed two by following this diagram.

The incorrect diagram I downloaded from geckos website in late august, the current one for download is correct but the revision number has not changed so it is not obvious whether you have the right wiring diagram.

Here's how you tell.
On page #1 the written descriptions are correct on both instruction sheets.
On page #2 the diagram in the dodgy sheet contradicts the description on page 1.

If your description and diagram agree (the correct version is pin 26 - no connection and pin28 - step) then you're good to go.
The wrong version has these two pins reversed.

I have emailled gecko my dodgy diagram and told them that following their pinout has killed two of my G250's. I have yet to get a response from them.