The SIO kit contains 9-to-25 adapters, gender chagners, null modem adapter, a loopback tester, serial cable, and the like. It's worthwhile to have on hand for troubleshooting and to resolve any cabling issues with the serial integration. I am not certain if it is required or not.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...