The driver used for Real COM Mode comes with the NPort Windows Administrator which will install automatically on your computer when you install NPort Administration Suite.
The important point is that Real COM Mode allows users to continue using
Real COM Mode allows several hosts to have access control of the same NPort. The Moxa driver that comes with your NPort controls host access to attached serial devices by checking the host’s IP address.
Modify the Accessible IP Setting table when the legal IP address should be required in your application.