When troubleshoting communcation here at Neets we use a terminal software called Docklight and Docklight Scripting, where the scripting version is also able of doing networked communication.
You can download the different versions here: https://docklight.de/
Docklight can be found here and is available in both a paid and free version, where the free doesn't let you save your files and you are not able to copy/paste strings either. The latter is helpful when developing drivers in Neets Device Editor.
You can see in the video below how we in many cases on our website some times adds a Docklight file for some of our products, this both for troubleshooting and for when you create a driver for a third party controller.
You can add commands, send/receive, change com ports and much more with ease in the software!
The only thing you'd need for sending serial commands is a RS232 port, which many modern laptop doesn't have, but all you need then, is our USB to RS232 adapter which we of course sell on our website.