I got the USB to work and all is good. It turns out yes there was an
installation manual with the original 302A and it had the Serial port
on the 302A. I sent it back to Cambridge and they upgraded the 302A to
USB ports. The only problem was the USB port they installed was the
wrong type. They installed a USBA port instead of a USBB. The 302A is
a slave not a primary, but that is a different discussion. Jeff sent
the 302A back to me and I tried to power it up using their
instructions. Well I had got a USBA to USBA cable from Fry's because
there was not one with the upgrade and the instructions said that the
device driver is stored on the unit. Well I got a data transfer cable
with the USBA to USBA connectors. It turns out that was the incorrect
one according to Jeff at Cambridge. I exhausted all my options trying
to get the Windows laptop and the 302A to interface. I was able to
download data on it but upload anything.

I just tried to put my name and the LS-4 data in the 302A but it would
not take. I reread the instructions and even placed calls to Jeff.
This went on for a week. I tried all the different drivers on the
Cambridge site. Nothing worked. Out of the Blue Jeff calls from
Cambridge and we talked. He asked a bunch of questions and the type of
questions he was asking gave me the impression that he had no clue
what he was doing. I thought the whole thing was odd. Jeff did ask one
key question though and he asked if the green LED on the front was on
and stayed on? I told him that it was infact on and said send it back
to me.

So another week goes by and he calls me again and says that the
firmware was erased off of the 302A. I said well could you tell me
what I might have done to do that so I can prevent it from happening
again? He said well there is nothing that the end user can do to erase
it. Well he said he replaced the processor in the 302A. I just got it
back yesterday and played with it. I was able to get it to interface
with both my computers so I am out about $200 for the Upgrade,the
calibrating, and shipping but it is working now. D