Monitor Power Management Control; Monitor Connector - Compaq Evo D500 Technical Reference Manual

Chapter 6 Embedded Graphics Subsystems
6.4

MONITOR POWER MANAGEMENT CONTROL

The embedded graphics controllers provide monitor power control for monitors that conform to
the VESA display power management signaling (DPMS) protocol. This protocol defines different
power consumption conditions and uses the HSYNC and VSYNC signals to select a monitor's
power condition. Table 6-4 lists the monitor power conditions.
Table 6-4. Monitor Power Management Conditions
HSYNC VSYNC
Active Active
Active Inactive
Inactive Inactive
6.5

MONITOR CONNECTOR

A DB-15 connector is provided on the rear chassis for connection to an analog monitor. The
pinout for this connector is shown in Figure 6-3 and Table 6-5.
Figure 6-3. VGA Monitor Connector, (Female DB-15, as viewed from rear).
Table 6-5. DB-15 Monitor Connector Pinout
Pin Signal
1 R
2 G
3 B
4 NC
5 GND
6 R GND
7 G GND
8 B GND
NOTES:
[1] Fuse automatically resets when excessive load is removed.
6-8 Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Table 6-4.
Monitor Power Management Conditions
Power Mode Description
On Monitor is completely powered up. If activated, the inactivity
counter counts down during system inactivity and if allowed to
tiemout, generates an SMI to initiate the Suspend mode.
Suspend Monitor's high voltage section is turned off and CRT heater
(filament) voltage is reduced from 6.6 to 4.4 VDC. The Off mode
inactivity timer counts down from the preset value and if allowed
to timeout, another SMI is generated and serviced, resulting in
the monitor being placed into the Off mode. Wake up from
Suspend mode is typically a few seconds.
Off Monitor's high voltage section and heater circuitry is turned off.
Wake up from Off mode is a little longer than from Suspend.
9
Table 6-5.
DB-15 Monitor Connector Pinout
Description Pin
Red Analog 9
Blue Analog 10
Green Analog 11
Not Connected 12
Ground 13
Red Analog Ground 14
Blue Analog Ground 15
Green Analog Ground --
Fifth Edition - March 2002
Signal Description
PWR +5 VDC (fused) [1]
GND Ground
NC Not Connected
SDA DDC2-B Data
HSync Horizontal Sync
VSync Vertical Sync
SCL DDC2-B Clock
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