About Rgb Video Output - NEC DT20 User Manual

About the PC Input and Output
The 15-pin mini D-Sub connectors are used for the PC input and output terminals. The
following shows the relationship between the pins and the input and output signals.
5 4 3
10 9
15 14 13 12
NOTE
• This projector uses a 15-pin RGB input and an analog type output terminals. For this reason, it cannot be
connected to a digital output type personal computer.
• Plug and play is not supported.

■ About RGB Video Output

●
Signal timing
The following shows the timing that signals are output from the RGB video output terminal.
(XGA 60Hz speed or equivalent)
The video signal output is determined by whether "PC/OHP" or "OHP" is selected in "RGB-
OUT Selection" on the "Setting 2" menu. See page E-45 for more information.
Horizontal
sync signal
e
w
Horizontal
sync signal
Vertical
sync signal
NOTE
• The screen is sometimes not displayed normally depending on the monitor or projector that is connected.
• Images from a PC are output in standby.
q RED VIDEO
2 1
w GREEN VIDEO
8 7 6
e BLUE VIDEO
r GND
11
t NC
r
q
q
Cycle
w
Sync signal width
e
Back porch
r
Display interval
t
Cycle
y
Sync signal width
u
Back porch
i
Display interval
Scan mode
Connecting to a Personal Computer
y GND
u GND
i GND
o NC
!0 GND
Vertical
sync signal
u
y
20.677 µs
2.092 µs
2.462 µs
15.754 µs
806 H
6 H
29 H
768 H
Non-interlaced
E-23
!1 NC
!2 Pull up (+5V)
!3 H.SYNC
!4 V.SYNC
!5 Pull up (+5V)
i
t