Dell OptiPlex 755 User Manual page 149

To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
14. If you removed a network-adapter card connector:
a. Enter system setup, select Integrated NIC from the Onboard Devices group, and change the setting to On (see
b. Connect the network cable to the integrated network connector on the back panel of the computer.
PS/2 Serial Port Adapter
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
Installing a PS/2 Serial Port Adapter
1. Follow the procedures in Before You
2. Remove the computer cover (see
3. Gently lift the release tab on the card retention latch from the inside and pivot the latch open.
4. Remove the filler bracket (if applicable).
NOTE: See the documentation that came with the adapter for information on configuring the adapter, making internal connections, or customizing it for
your computer.
5. Align the PS/2 serial-port adapter bracket in the retention slot and press down firmly. Ensure that the adapter is fully seated in the slot.
6. Before you close the card retention mechanism, ensure that:
The tops of all cards and filler brackets are flush with the alignment bar.
l
The notch in the top of the card or filler bracket fits around the alignment guide.
l
7. Secure the card(s) by closing the card retention latch and snapping it into place.
NOTICE: Do not route card cables over the cards. Cables routed over the cards can prevent the computer cover from closing properly or cause damage
to the equipment.
1 release tab 2 adapter retention latch
4 serial port adapter 5 serial port adapter system board
connector connector (PS2/SERIAL2)
8. Connect the adapter cable to the PS/2 serial port adapter connector (PS2/SERIAL2) on the system board (see
Begin.
Removing the Computer Cover).
3 serial port adapter
bracket
System Setup).
System Board Components).