The Real-time Monitor port has many uses in optimizing system tuning, debugging your machine software, characterizing your mechanics, etc. What differentiates this feature from the more common PC screen monitor supplied by other servo systems is its real-time nature.
First, this will give you very rapid feedback while tuning or optimizing your command profiles. Literally hundreds of trials can be accomplished in a less than an hour. Using the accelerator keys (within QuickSet™) to change key tuning variables while watching a scope screen is an extremely rapid way to tune. You can literally accomplish in moments what can take days with other servo systems.
Second, the Real-time Monitor Port is truly a "live" real-time reporting signal, so you can use it with an oscilloscope to watch how your motion is synchronized with other machine events like sensor outputs, machine timing signals, etc.

Improve Machine Timing
Because you use the Real-time Monitor Port with your scope, it’s easy to get both an average and worst case picture of how motion and other events are timed. This tool can help you reduce your software development by speeding the debug of your machine timing software. And, the Real-time Monitor Port signal is easy to trigger on because a "sync-pulse" is provided at the start of move no matter what internal variable you are looking at. The sync pulse makes it easy to overlay multiple variables using a digital storage scope.

Get the "Whole Picture"
The Real-time Monitor Port can be used to view Commanded Velocity, Actual Velocity, Position Accuracy, Commanded Torque, Actual Torque, and more. All of these variables can be scaled over a very wide range so you can "zoom-in" to look at fine detail or "zoom-out" to get the big picture.
The Real-time Monitor Port’s viewed variable and the scaling, once set, are non-volatile, so the SST-servo drive can be setup at your factory to produce a "standard" diagnostic signal for customer technicians to use. For example, if you leave the variable set for Actual Torque, a technician can monitor system friction or endpoint force very conveniently.
The Real-time Monitor Port is especially useful for monitoring machine mechanics for wear, misalignment, backlash, stretch and bearing pre-load, both in production and in the field.
As an engineering aid, the Real-time Monitor Port, together with the drive’s built in tuning stimulus, can be used to measure the reflected inertia and friction of the mechanics to verify engineering calculations, torque headroom, etc.