Hardware Reference Manual

Table 2-1 Riser Card Configurations
No. Expansion Slots
1 PCI Express x1 Expansion Card slot
2 PCI Expansion Card slot
3 Powered Serial Port Expansion Card slot
NOTE: Although there are two slots in each riser card, you can only install one
expansion card in the riser card.
The bottom slot on each card (3) is designed specifically for an HP Powered Serial Port
expansion card. DO NOT attempt to plug any other type of card into the bottom slot.
Installing an Optional Powered Serial Port Expansion Card
Two powered serial ports, COM 1 and COM 2, are standard on the computer. Some models have a
powered serial port expansion card installed that supplies two additional powered serial ports, COM 3
and COM 4. If your computer is not configured with a powered serial port expansion card, you may
purchase one from HP.
Figure 2-9 Powered Serial Ports
Table 2-2 Powered Serial Ports
Item Description Supports
+5V +12V
1COM 1 Yes Yes
2COM 2 Yes Yes
3 COM 3 (optional) Yes Yes
4 COM 4 (optional) Yes Yes
NOTE: The powered serial ports are configured for power in the
Computer Setup utility. Refer to
Configuring Powered Serial Ports
on page 16 for more information.
CAUTION: Be careful when connecting peripheral devices to powered 5V and 12V serial ports. The
peripheral device must require the same voltage for which the powered serial port is configured.
Connecting a peripheral device that is not rated for the same voltage supplied by the powered serial
port can damage the computer and the peripheral device.
Installing an Expansion Card 13