Dell OptiPlex GX280 - Manual (Page 315)

3. Remove the filler bracket.
4. Slide the serial port adapter bracket down over the card-slot opening, and lower the retention arm, ensuring that:
The tops of all cards and filler brackets are flush with the alignment bar.
The notch in the top of the adapter or filler bracket fits around the alignment guide.
5. Press the retention arm into place, securing the adapter in the computer.
1 serial port system board connector (SER_PS2)
2 serial adapter cable
3 serial port adapter bracket
4 retention arm
6. Attach the serial adapter cable to the connector labeled "SER_PS2" on the system board .
7. Continue with step 7 in the next procedure.
Removing a Serial Port Adapter
1. Follow the procedures in " Before You Begin ."
2. Disconnect the serial adapter cable from the connector on the system board.
3. Raise the retention arm.
4. Lift and remove the adapter bracket.
5. If you are removing the adapter permanently, install a filler bracket in the empty card-slot opening.