Moxa Technologies 5400 - Manual (Page 26)

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 RS-232/422/485 serial
communications software that was written for pure serial communications applications. The driver
intercepts data sent to the host’s COM port, packs it into a TCP/IP packet, and then redirects it
through the host’s Ethernet card. At the other end of the connection, the NPort accepts the Ethernet
frame, unpacks the TCP/IP packet, and then transparently sends it to the appropriate serial device
attached to one of the NPort’s serial ports.
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.
NPort 5400 Series User’s Manual 4-4