Setting Jumpers For A Specific Com Port - US Robotics Courier V.Everything Getting Started Manual

To change jumper settings, use tweezers or needle-nosed pliers and gently
rock the jumper back and forth as you lift.
Note: Do not grasp the shunts too firmly. If you grasp them too firmly,
you may crush the shunt or damage the modem.

Setting Jumpers for a Specific COM Port

You can put shunts on the COM port jumper block to configure the
desired COM port:
To set your modem to
COM 1
COM 2
COM 3
COM 4
DIP Switches and Jumpers
Figure 8.6 Jumper Blocks Without Shunts
Figure 8.7 Shunt
To set the jumpers to
7-5