QTR-Quadtone RIP

Thanks for the Keywizard tip - sadly it's 300 quid in the UK and Gretag 
can't say for sure it will work...

So this is the problem, still:

It's a ED 100 densitometer made by EFI that I'm trying to get to work.

So far I've used ToolCrib from X-rite (free!) to test that the instrument is 
working and it does seem that it is.  Setting Toolcrib to look for 
"generic"  in the drop-down box and setting serial protocol to COM 1, 
9600 baud, pressing the green "READ" button on the densi returns a 
value to tool crib.

Toolcrib will auto-paste these values into Excel....  (looked like I was 
getting somewhere) like this:

MGI RD-200 000255 00095B 00077A 00301A
MGI RD-200 000256 0007DA 000C24 003A47
MGI RD-200 000257 0007DD 000C27 003A64
MGI RD-200 000258 0007DF 000C26 003A5B
MGI RD-200 000259 0007DE 000C25 003A5E
MGI RD-200 00025A 0007E0 000C49 003C5C
MGI RD-200 00025B 0007E0 000C30 003BC5
MGI RD-200 00025C 0007E4 000C3E 003C3B
MGI RD-200 00025D 0007DF 000C2A 003AA9

The first two blocks are always the same - device type?

The next block increments with each reading. Reading number I assume.

The next three blocks seem to be hex values - RGB ?
The do change when measurements are taken on different reflective 
surfaces and stay constant if successive readings are taken on the 
same surface.

Looks like it works ok as a generic serial device.  Here's the question 
finally -

Is there a prog or excel macro which will convert these raw readings to 
something useful for reading density?

Is there a (free or cheap) prog which will talk to this instrument as a 
generic serial densi and produce the same info?

Lots of info there, sorry, but it's probably best to set it all out rather than 
have to be asked.

Thanks
Andy