How do you eavesdrop on a serial com port?

I am working with a discontinued, and unsupported, motion controller made by Thomson Linear, model ODM-005i. It has a RS-232 port for operating the controller from a host computer. This controller originally came with Thomson's OMNI LINK software, written for Windows 3.1, to send commands to the controller. I have this software, but I would like to create an application using Matlab automate a sequence of commands complete with a GUI. So I need a list of commands that I can use to communicate with the controller. However, the Host Command Reference material is not available online, from Thomson, in the user manual for the controller, and I cannot find any mention of the material in the OMNI LINK help pages.

What I would like to do is use matlab to eavesdrop on the com port while I send commands via the OMNI LINK software so that I can decode the sytax used for communication and create my own list of commands. Is there a way to do this with Matlab?

Answer 1

[Walter Roberson]

https://docs.microsoft.com/en-us/sysinternals/downloads/portmon