You don't need to measure voltages, just get the pinout for both serial cables and build your cable. The only time I measure voltage is when I don't have the docs.
I have a bag of RJ45 <-> DB9 and RJ45 <-> DB25 adapters. When I need to connect something via serial it's very straightforward. Look at the tech docs for both pieces of hardware and build your cable. A BOB ( BreakOutBox ) is also handy to have, but not needed. A quick search on Googley found http://www.pitt.edu/~bdgregg/Cable_Wireing.html Remember real hardware hackers eat serial for breakfast. :-) diana
