The Ultima 2000 manual describes the pinouts for a 25 pin serial connector. However, if you use a laptop computer then you will need to use a 9 pin serial connector. A simple DB-9 interface cable can be built for less than $12 with the following supplies from Radio Shack:

Begin by examining the modular RJ-12 connectors on the 25 ft. wire. Hold the connectors with the clip facing away from you. You will notice that the color of the wires in one connector are (from left to right): blue yellow green red black white - THIS IS THE CONNECTOR YOU WANT TO SAVE.

save this connector

In the other connector they are opposite (again, from left to right): white black red green yellow blue - THIS IS THE CONNECTOR YOU NEED TO CUT OFF.

Once you have the correct modular connector snipped off you will need to strip ~ 1 inch of the outer jacket to expose the insulated wires inside. Be careful not to nick any of the wires! Once the insulated wires are exposed you will need to strip ~ 1/4 inch of the insulation to expose the bare wire. Do this on the yellow green red and black wires. The blue and white wires are not needed and can be cut off where the outer jacket begins.

Begin by tinning the ends of the exposed wires from the 25 ft wire. The wires then need to be soldered to the following pins on the D-sub connector:

connector as seen from the solder pin side

All that remains is to tuck the wire inside the D-sub hood and screw the halves together.

The completed DB-9 connector

The RS-232 port on the Ultima 2000 is the larger of the 2 jacks on the hand controller.