NEC LT280 Owner's manual

LT280
NEC
Brand
NEC
Model
LT280
Category
Data projectors
Type
Owner's manual

NEC LT280 is a versatile and powerful projector that offers impressive performance for a variety of applications. With its 2500 ANSI lumens brightness and XGA resolution, it delivers crisp and vibrant images even in well-lit rooms. The LT280 features a 1.5 - 1.8:1 throw ratio and a wide range of connectivity options, including HDMI, DVI, VGA, and composite video. It also has a built-in speaker for audio output. Whether you're using it for business presentations, educational purposes, or home entertainment, the LT280 is sure to meet your needs.

NEC LT280 is a versatile and powerful projector that offers impressive performance for a variety of applications. With its 2500 ANSI lumens brightness and XGA resolution, it delivers crisp and vibrant images even in well-lit rooms. The LT280 features a 1.5 - 1.8:1 throw ratio and a wide range of connectivity options, including HDMI, DVI, VGA, and composite video. It also has a built-in speaker for audio output. Whether you're using it for business presentations, educational purposes, or home entertainment, the LT280 is sure to meet your needs.

NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 1 of 6
Contents
Product Description, Lens Specs, Notes and Formulas Pg 1
Diagrams & Distance Charts
Pg 2
Cabinet Dimensions_____________
Pg 3
Ceiling Mount Dimensions _________
Pg 4
Input Panel and Control Codes
Pg 5
Product Description
Type: 3 panel LCD projector, Brightness: LT280: 2500 ANSI Lumens
0.7” p-Si TFT w/MLA Dimensions: 12.2”(W) x 10.2”(H) x 4.4”(D)
Resolution: LT280: 1024 x 768 Weight: 6.17 lbs
Lens Specifications
Throw Ratio: 1.5 – 1.8:1 (for 100” diagonal) Focal Length: 21.69mm – 25.9mm
Offset Angle: 9.5° - 12.1° (for 100” diagonal) F/#: 1.7 - 2.0
Screen Sizes: 25” - 300” diagonal (4:3) Manual Focus/Manual Zoom
Notes
For screen sizes not indicated on the projection tables, use the formulas below.
If the figures on the tables do not match the results of formulas, use the figures in the table.
• All calculations are based on 4:3 aspect ratio.
• Distances are in inches, for millimeters multiply by 25.4.
• Distances may vary ±5%.
Formulas
The Projection Formulas use the image width for calculation. For proper projection placement, determine the image width
for the desired screen size. Use the Screen Formulas below to calculate all screen dimensions. Plug in the width for “W” in
the Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 2:
Definitions: 4:3 Screen Formulas:
W = Image Width W = H x 4/3
H = Image Height (size) H = W x 3/4
B = Vertical distance between lens center and screen center Screen Diagonal = W x 5/4
C = Throw distance
D = Vertical distance between lens center and screen top
(screen bottom for desktop application)
Projection Formulas:
B = 0.298W
C(wide) = 1.481W - 1.425
C (tele)=1.787 – 1.406
D = 0.0771W
α(wide) = tan¯¹ (B/C(wide))
α (tele) = tan¯¹ (B/C(tele))
NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 2 of 6
Diagrams and Distance Charts
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of
installation.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mounted
Desktop
Distance Chart for popular 4:3 screens
Note: For screen sizes not indicated on the projection
tables, use the formulas on page 1.
Screen Size (4:3)
Diag W H
inches inches inches inches inches
30 24 18 7 -2
60 48 36 14 -4
72 57.6 43.2 17 -5
84 67.2 50.4 20 -5
90 72 54 21 -6
100 80 60 24 -6
120 96 72 29 -7
150 120 90 36 -9
180 144 108 43 -11
200 160 120 48 -12
250 200 150 60 -15
300 240 180 72 -18
B
C
wide - tele
D
α
wide - tele
inches degrees
34 - 41 9.8 - 11.9
69 - 84 9.6 - 11.7
83 - 102 9.6 - 11.6
98 - 119 9.6 - 11.6
105 - 127 9.6 - 11.6
117 - 141 9.6 - 11.6
141 -170 9.6 - 11.5
176 - 213 9.5 - 11.5
211 - 256 9.5 - 11.5
354 - 428 9.5 - 11.5
235 - 285 9.5 - 11.5
294 - 356 9.5 - 11.5
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Bottom
2.54"
B
C
Lens Ctr
Screen Ctr
Throw Distance
Screen Top
6.30"
5.65"
Lens Offset From
Mount Pipe
2.62"
D
D
NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 3 of 6
Cabinet Dimensions
The following drawings show the cabinet dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.
Lens center
Lens center
11.39
11.34
2.81
11.57
4.72
2.54 (FOOT)
2.30 (boss)
4.76
0.70 (LENS MAX)
0.78 (LENS MIN)
5.01
1.537.10
ventilation
NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 4 of 6
Cabinet Dimensions (continued)
The following drawings show the cabinet dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.
3 - M4 * 8 max.
Lens center
2.85 6.85
1.83 3.60
7.28
0.98
for Ceiling Mount
Lamp
security slot
ventilation
ventilation
8.22
1.15
AC input
Power Switch
NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 5 of 6
Optional Ceiling Mount Dimensions (Model #: VL80CM)
The following drawings show the ceiling mount dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.
8.62
2.71
2.99
3.35
8.74
NEC Solutions (America), Inc.
Visual Systems Division
LT280 Installation Guide
Ceiling Mounted and Desktop Rev 1.0
www.visualsystems.com LT280 Page 6 of 6
Input Panel
PC Control Codes
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT CCOMPUTER 02H 03H 00H 00H 02H 01H 01H 09H
INPUT SELECT VIDEO 02H 03H 00H 00H 02H 01H 06H 0EH
INPUT SELECT S-VIDEO 02H 03H 00H 00H 02H 01H 0BH 13H
INPUT SELECT DVI (DIGITAL) 02H 03H 00H 00H 02H 01H 1AH 22H
PICTURE MUTE ON 02H 10H 00H 00H 00H 12H
PICTURE MUTE OFF 02H 11H 00H 00H 00H 13H
SOUND MUTE ON 02H 12H 00H 00H 00H 14H
SOUND MUTE OFF 02H 13H 00H 00H 00H 15H
Note: Contact your NEC rep for codes not listed.
Cable Connection
Communication Protocol:
Baud Rate: 38400 bps (for cable lengths longer than 20’, it is recommended changing to 9600 bps in setup menu)
Data Length: 8 bits
Parity: No Parity
Stop Bit: One Bit
X on/off: None
Communications: Full duplex
NOTE 1 : Pins 2, 3, 5, and 6 are used inside the projector.
NOTE 2: For long cable runs it is recommended to set communication speed within the projector to 9600 bps.
12
34
5
67 8
9
To GND of PC
To RxD of PC
To TxD of PC
To CTS of PC
To RTS of PC
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NEC LT280 Owner's manual

LT280
NEC
Brand
NEC
Model
LT280
Category
Data projectors
Type
Owner's manual

NEC LT280 is a versatile and powerful projector that offers impressive performance for a variety of applications. With its 2500 ANSI lumens brightness and XGA resolution, it delivers crisp and vibrant images even in well-lit rooms. The LT280 features a 1.5 - 1.8:1 throw ratio and a wide range of connectivity options, including HDMI, DVI, VGA, and composite video. It also has a built-in speaker for audio output. Whether you're using it for business presentations, educational purposes, or home entertainment, the LT280 is sure to meet your needs.

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