Edgeport - PC (Server 2003) won't accept more than 16 serial ports. How do I expand this maximum setting?

Edgeport 4/16
Windows server 2003
If the PC recognizes (Device MGR) over 16 serial ports, but it won’t allow me to use over 16 ports, the Edgeport is of little use. I’ve read that the number of serial ports can be increased - that it is a setting in OCX. Digi must have faced this question before.