If you use a RS Blackbox with COM-port to collect machine signals, the usual practice is to connect it to the PC that runs Operator tools and let the Operator tools client take care of data collection from the box.

👌 See also Select PC for Operator tools

👌 See also How much hardware will you need? for more details on how to use the Operator tools PC to connect to a RS Blackbox that collects machine signals.