What controls do you have? We can monitor some Siemens, Mazaks and Fanucs through the Ethernet port and give a load of information that is unambiguous including Feed Rates turned down etc.. It does depend on age. My advice for the older controls, accept the limitations - you will spend a lot of time and effort and frustration trying to eek out every signal from them. DPRNT & data acquisition modules work but can be time consuming to add. If your Mazaks are Fusion / Matrix, your Siemens is 840D (PCU50) and your Fanuc an i Series with FOCAS we just install some software, plug in a cable and away you go... no major program changes or signal finding required.