Hi,
Can you connect more than 1 of these to a computer at once?
If so, is there a limit to how many (other than number of COM ports supported by the OS)?
Thank you!
Hi,
Yes, you can! 
In theory, USB hubs can extend a connection to up-to 127 devices. Therefore, if you have only one hub on your computer, this could be your theoretical limit. That being said, most hubs do not actually support that many devices and even if they did, they would most likely not be able to power all of them properly well before reaching that limit. As you may already know, the USB protocol allows for an allowance of up-to 100 mA per device (before it requests more), therefore that would be a large amount of current for that many devices (over 12 A!).
Your OS would most likely be the least limiting factor, since it is a logical limit imposed by software design and not an actual hard limit, unlike current (mentioned above) or other physical limitations of the internals of the hub in your computer and other firmware details of those components.
Therefore, you should be able to safely use at least as many as you have USB ports, since we can assume that by design, the hub supports at least that many devices simultaneously. If you add a powered hub, then you can most likely add a few to dozens of extra SSC-32U before you run into issues.
Good luck with your project!
Sincerely,
That’s great information, thank you!