PCI Port POST Code Reader and HP/Dell/Lenovo

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I recently purchased one of the PCI port POST code readers.  I want to use it in HP Z*40, HP Z*20, Dell T5810...etc.  Is there a translation table for the codes that are popping up on the reader for the  HP Z*40, HP Z*20, Dell T5810...etc.?  How are the codes generated from the system and passed to the reader or how is the reader detecting the progression during POST?