NEC MultiSync LT245 User manual

www.necvisualsystems.com LT245 Page 1 of 7
NEC Solutions (America), Inc.
VisualSystems
LT245 Installation Guide
Used with 4:3 and 16:9 screens v1.1
Contents
Product Description, Lens Specs,
Screen/Aspect Ratio, Notes and Formulas Pg. 1
Diagrams and Distance Charts, 4:3 Screens Pg. 2
16:9Screens Pg. 3
Cabinet Dimensions, Top, Front and Right Pg. 4
Bottom, Back and Left Pg. 5
Ceiling Mount Dimensions Pg. 6
Input Panel and Control Codes Pg. 7
ProductDescription
Type: 1chip DMDTM projector, Color Wheel: 4 segment
Resolution: 1024 x 768 (4:3) Dimensions: 10.24”(W) x 4.84”(H) x 12.40”(D)
1024 x 576 (16:9) Weight: 7.1 lbs
Brightness: 2200 ANSI lumens
Lens Specifications
Throw Ratio: 1.5 - 1.9:1(for 100” diagonal) Focal Length: 22.1mm – 26.5mm
Offset Angle: 15.7°-18.7° (for 100” diagonal) F/#: 2.2 – 2.5
Screen Sizes: 30”-500” diagonal (4:3) Manual Zoom / Focus
Screen/AspectRatio
Both 4:3 and 16:9 screens are fully supported with proper aspect ratio control for both type sources using NEC developed
scaling technology. By selecting the screen type in the menus, Aspect Ratio control is reconfigured for that screen type.
•For a 4:3 screen; select “4:3” in the “Screen” menu for proper aspect ratio control of 4:3 and 16:9 sources.
•For a 16:9 screen; select “16:9” in the “Screen” menu for proper aspect ratio control of 4:3 and 16:9 sources.
*Factory default “Screen” setting is “4:3”.
Notes
For screen sizes not indicated on the projection charts, use the formulas below.
The ceiling must be strong enough to support the projector and the installation must be in accordance with any local
building codes.
Distances are in inches, for millimeters multiply by 25.4.
Distances may vary ±5%.
Formulas
The Projection Formulas use the image width for calculation. Image width is the same for all aspect ratios, only vertical image size
varies. For proper projector placement, determine the image width for a desired screen size. Use the Screen Formulas below to
calculate all screen dimensions. Plug in the image width for “W” in the Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 2 and 3.
Definitions: 4:3 Screen Formulas:
W= Image Width W=Hx4/3
H= Image Height (Size) H=Wx3/4
B= Vertical distance between lens center and screen center Screen Diagonal = W x 5/4
C=Throwdistance
D= Vertical distance between lens center and screen top 16:9 Screen Formulas:
(screen bottom for desktop application). W= H x 16/9
α=Projectionangle H= W x 9/16
Screen Diagonal = W x 18.35756/16
Projection Formulas:
B= 0.5248W - 0.053 Vertical Position for a 16:9 screen: The Vertical Position adjustment moves the 16:9
C(wide) = 1.5692W – 1.978 image up and down in the unused portion of the 4:3 panel. This adjustment is only
C(tele) = 1.8836W – 1.9 available when the projector is set for ‘16:9’ in the ‘Screen’ menu. The range of Vertical
D(4:3) = 0.1498W - 0.053 Position is dependent on aspect ratio and 3D Reform used. If 3D Reform is not used,
D(16:9) = 0.24355W - 0.053 the approximate range of Vertical Position is +/-0.167H (H=Screen Height) when using
α(wide) = tan-1 (B/C(wide)) a 16:9 screen.
α(tele) = tan-1 (B/C(tele))

www.necvisualsystems.com LT245 Page 2 of 7
Diagrams and Distance Charts for 4:3 Screens
The following diagrams show the relationship between projector position and the screen. Refer to the chart below for data.
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 chart,
use the formulas on page 1.
Screen Top
Throw Distance
Screen Ctr
D
Lens offset from
mount center
α
5.8"
Lens Ctr
B
2.5"
6.5"
C
Screen Bottom
Throw Distance
Screen Ctr
D
α
Lens Ctr
B
3.3"
C
BD
Diag W H wide
-
tele wide
-
tele
inches inches inches inches inches
30 24 18 12.5 35.7
-
43.3 3.5 19.4
-
16.2
60 48 36 25.1 73.3
-
88.5 7.1 18.9
-
15.9
72 57.6 43.2 30.2 88.4
-
106.6 8.6 18.8
-
15.8
84 67.2 50.4 35.2 103.5
-
124.7 10.0 18.8
-
15.8
90 72 54 37.7 111.0
-
133.7 10.7 18.8
-
15.8
100 80 60 41.9 123.6
-
148.8 11.9 18.7
-
15.7
120 96 72 50.3 148.7
-
178.9 14.3 18.7
-
15.7
150 120 90 62.9 186.3
-
224.1 17.9 18.7
-
15.7
180 144 108 75.5 224.0
-
269.3 21.5 18.6
-
15.7
200 160 120 83.9 249.1
-
299.5 23.9 18.6
-
15.7
250 200 150 104.9 311.9
-
374.8 29.9 18.6
-
15.6
300 240 180 125.9 374.6
-
450.2 35.9 18.6
-
15.6
350 280 210 146.9 437.4
-
525.5 41.9 18.6
-
15.6
400 320 240 167.9 500.2
-
600.9 47.9 18.6
-
15.6
450 360 270 188.9 562.9
-
676.2 53.9 18.5
-
15.6
500 400 300 209.9 625.7
-
751.5 59.9 18.5
-
15.6
Screen Size (4:3) C
inches
α
degrees

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Diagrams and Distance Charts for 16:9 Screens
The following diagram shows the relationship between projector position and the screen. Refer to the chart below for data.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling
Mounted
Desktop
Distance chart for popular 16:9 screens
Vertical Position for a 16:9 screen
The Vertical Position adjustment moves the 16:9
image up and down in the unused portion of the
4:3 panel. This adjustment is only available when
the projector is set for ‘16:9’ in the ‘Screen’ menu.
The range of Vertical Position is dependent on
aspect ratio and 3D Reform used. If 3D Reform
is not used, the approximate range of Vertical
Position is +/-0.167H (H=Screen Height) when
using a 16:9 screen.
Note: For screen sizes not indicated on the chart,
use the formulas on page 1.
Screen Top
Throw Distance
Screen Ctr
D
Lens offset from
mount center
α
5.8"
Lens Ctr
B
2.5"
6.5"
C
Screen Bottom
Throw DistanceScreen Ctr
D
α
Lens Ctr
B
3.3"
C
BD
Diag W H wide
-
tele wide
-
tele
inches inches inches inches inches
28 24 13.5 12.5 35.7
-
43.3 5.8 19.4
-
16.2
55 48 27 25.1 73.3
-
88.5 11.6 18.9
-
15.9
60 53 29.5 27.5 80.4
-
97.0 12.7 18.9
-
15.8
73 64 36 33.5 98.5
-
118.7 15.5 18.8
-
15.8
82.6 72 40.5 37.7 111.0
-
133.7 17.5 18.8
-
15.8
92 80 45 41.9 123.6
-
148.8 19.4 18.7
-
15.7
100 87 49 45.6 134.5
-
162.0 21.1 18.7
-
15.7
106 92 52 48.2 142.4
-
171.4 22.4 18.7
-
15.7
110 96 54 50.3 148.7
-
178.9 23.3 18.7
-
15.7
119 104 58.5 54.5 161.2
-
194.0 25.3 18.7
-
15.7
123 107 60 56.1 165.9
-
199.6 26.0 18.7
-
15.7
133 116 65 60.8 180.0
-
216.6 28.2 18.7
-
15.7
135 118 66 61.9 183.2
-
220.4 28.7 18.7
-
15.7
159.5 139 78 72.9 216.1
-
259.9 33.8 18.6
-
15.7
161 140 79 73.4 217.7
-
261.8 34.0 18.6
-
15.7
459 400 225 209.9 625.7
-
751.5 97.4 18.5
-
15.6
Screen Size (16:9) C
inches
α
degrees

www.necvisualsystems.com LT245 Page 4 of 7
Cabinet Dimensions
The following drawings show the cabinet dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.

www.necvisualsystems.com LT245 Page 5 of 7
Cabinet Dimensions (continued)
The following drawings show the cabinet dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.

www.necvisualsystems.com LT245 Page 6 of 7
Optional Ceiling Mount Dimensions (Model #: LT65CM)
The following drawings show ceiling mount dimensions.
Dimensions are in inches. For millimeters multiply by 25.4.
The mount accommodates a 1.5” NPT treaded pipe extension or two 3/8”-16 threaded rod extensions.
Mount adjustments include roll, pitch and yaw.
Contact Peerless Industries for mount accessories at [phone].
0.406
1.5 NPT
7.398
8.062
3.044
2.669

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Input Panel
Control Codes
Function CodeData
POWERON 02H00H00H 00H 00H 02H
POWEROFF 02H01H00H 00H 00H 03H
INPUT SELECT RGB 1 02H 03H 00H 00H 02H 01H 01H 09H
INPUT SELECT RGB 2 02H 03H 00H 00H 02H 01H 02H 0AH
INPUT SELECT VIDEO 02H 03H 00H 00H 02H 01H 06H 0EH
INPUTSELECTS-VIDEO 02H03H 00H 00H 02H 01H 0BH 13H
INPUT SELECT VIEWER 02H 03H 00H 00H 02H 01H 1FH 27H
PICTUREMUTEON 02H10H00H 00H 00H 12H
PICTUREMUTEOFF 02H11H00H 00H 00H 13H
SOUNDMUTEON 02H12H00H 00H 00H 14H
SOUNDMUTEOFF 02H13H00H 00H 00H 15H
ON SCREEN MUTE ON 02H 14H 00H 00H 00H 16H
ON SCREEN MUTE OFF 02H 15H 00H 00H 00H 17H
ASPECT RATIO (4:3 Screen) 4:3 03H 10H 00H 00H 05H 18H 00H 00H 00H 00H 30H
Letterbox 03H 10H 00H 00H 05H 18H 00H 00H 01H 00H 31H
Widescreen 03H 10H 00H 00H 05H 18H 00H 00H 02H 00H 32H
Crop 03H10H00H 00H 05H 18H 00H 00H 03H 00H 33H
ASPECT RATIO (16:9 Screen) 4:3 Window 03H 10H 00H 00H 05H 18H 00H 00H 00H 00H 30H
Letterbox 03H 10H 00H 00H 05H 18H 00H 00H 01H 00H 31H
Widescreen 03H 10H 00H 00H 05H 18H 00H 00H 02H 00H 32H
4:3Fill 03H10H00H 00H 05H 18H 00H 00H 04H 00H 34H
AUTOADJUST 02H0FH 00H 00H 02H 05H 00H 18H
NOTE: Contact your NEC rep for codes not listed.
Cable Connection
Communication Protocol: PC Control Connector (DIN-8P)
Baud Rate: 38400 bps
Data Length: 8 bits
Parity: No Parity
Stop Bit: One bit
X on/off: None
Communications: Full duplex
NOTE 1: For LT265GOV, it is recommended to set Standby Mode to ‘Normal’ in the Setup menu for best Power ON response.
NOTE 2: Pins 2, 3, 5, 6 and 8 are used inside the projector..
NOTE 3: For long cable runs it is recommended to set communication speed within projector menus to 9600 bps.
PC CARD
MONITOR OUT
AUDIO OUT
AUDIO IN COMPUTER 2 INCOMPUTER 1 IN
PC CONTROL
S-VIDEO IN
VIDEO INR AUDIO IN L
LAN USB
To RxD of PC
12
345
678
To TxD of PCTo GND of PC