The Lexium mDrive line has been acquired by Novanta, so they are now called Liberty mDrive motors. You can still buy a few of the older Schneider Electric branded motors new from Radwell but who knows how long that'll last. The screenshot im posting is from the same motor but with the ethernet connectivity option rather than rs485; they also have ones for CANopen and Profinet.
Fully closed loop with a built in optical encoder as well as built in motor controller. IO pins with pins for voltage in and out for accessory systems. All you have to do is convert the rs485 db9 connector to USB and you can fully control the motor via their software. Parker used to sell the motor / stage combo (picture shows a manufacture date of 2018) but it looks like they have switched to their own motor brand.
Linear resolution = ball screw lead / encoder pulses per revolution. This particular stage has a 2mm pitch ball screw & the motor has 4000 pulses with quadrature (surprisingly low) which means this setup should be able to move in 0.5 micron steps without ever missing a step. I cant for the life of me find my rs485 to USB converter so I cant post too much more about it until I can find it.