Can I extend the length of the cable from an Intelliport II Card to the EX Box?
You really can’t extend the distance from the Card to the Board. What the cable and expansion box represent is an extension to the PC bus. This distance is limited to six feet by those standards written for PC buses. I would recommend that you investigate the possibility of using the IntelliServer line of products if distance is the problem. You can put an IntelliServer anywhere on your network, within the limitations of Ethernet, and you will have the serial ports that you need.