Can you explain how you use RS232?
What software would you use?
In the pictures there's also what looks like a USB port and some other digital connector (looks almost like midi). I sent a note to customer service to find out the story.
Edited to add: I found the manual, which answers some of these questions.
There's some interesting stuff about what fluids to circulate at different temperature ranges, including what kinds of water. The water details probably apply to all circulators, but the consumer companies aren't talking about them.