On the Jetson TX1, I have successfully been using a 4 pin USB to TTL Serial Cable - Debug/Console cable for Raspberry Pi (from Adafruit) connected to an Ubuntu PC running Minicom 115,200 8N1, software flow control with no issues for a while now. The cable is about 3 feet long. The red wire on the cable is not connected to the Jetson, of course. Those types of cable are ubiquitous, and can be had for just a few bucks. I already had one laying about that volunteered for the job.
I’ve only been able to find one or two different cables that terminate with 6 separated female 2.54mm sockets that include CTS/RTS, though it is more fun to make your own cable like discussed on the wiki.