2D Data Matrix Bar Coding

Hello again!  I know this might be a bit off track - but I can't think of 
a better group to ask!

We have begun marking our parts with 2d Data Matrix bar codes, however 
they are the dot-peen type.

This means our bar codes look like this:     
http://www.applegate.co.uk/images/sicmarking.jpg

Not this:    http://www.da-n.co.uk/blogs/lycett/media/datamatrix.gif

My question is if any of you have had any success finding a reader for the 
dot peen variety?
We've tried two that work on the high contrast version, but not the 
dot-peen type.

Thanks for letting my air my esoteric quandary!