NEC Lt81 Projector Users Manual

							D-Sub Pin Assignments
      PC 15-Pin mini D-Sub
Pin No. Signal to be connected
1 Red
2 Green
3 Blue
4 GND
5 GND
6 Red GND
7 Green GND
8 Blue GND
9 No Connection
10 Digital GND
11 GND
12 No Connection
13 Horizontal Sync
14 Vertical Sync
15 No Connection
1 2
3 4
5
11 12 13
14 15
6
7 8 9
10
  PC 15-Pin mini D-Sub99
SPECIFICATIONS 100 
						

							Timing Chart
101
SPECIFICATIONS 102
Y/N Signal Resolution Refresh F.H. Dot
Rate (Hz) (kHz) Clk(MHz)
Y NTSC 6402480 60 15.734 -
Y PAL 7682576 50 15.625 -
Y SECAM 7682576 50 15.625 -
Y VESA 6402350 85.08 37.86 31.5
Y IBM 6402400 70 31.47 25.175
Y VESA 6402400 85.08 37.86 31.5
Y MAC 6402400 66 35 30.24
Y VESA 6402480 59.94 31.47 25.175
Y IBM 6402480 60 31.47 25.175
Y MAC 6402480 60 31.47 25.175
Y MAC 6402480 66.7 34.97 31.334
Y MAC 6402480 66.67 35 30.24
Y VESA 6402480 72.81 37.86 31.5
Y VESA 6402480 75 37.5 31.5
Y IBM 6402480 75 39.375 31.49
Y VESA 6402480 85.01 43.269 36
Y IBM 7202350 70.09 31.469 28.322
Y IBM 7202400 70.09 31.4469 28.322
Y VESA 7202400 85.04 37.927 40
Y IBM 7202350 87.85 39.44 35.5
# 11522870, # 11522900 and # 128021024
images are compressed into 10242768 on
LT100.
Y IBM 7202400 87.7 39.375 35.5
Y VESA 8002600 56.25 35.16 36
Y VESA 8002600 60.32 37.879 40
Y VESA 8002600 72.19 48.077 50
Y VESA 8002600 75 46.88 49.5
Y VESA 8002600 85.06 53.674 56.25
Y MAC 8322624 74.55 49.725 57.283
N VESA 10242768 43interlace 35.5 44.9
Y VESA 10242768 60 48.363 65
Y VESA 10242768 70.07 57.476 75
Y IBM 10242768 72.03 58.131 79
Y MAC 10242768 74.93 60.241 80
Y VESA 10242768 75.03 60.023 78.75
# VESA 10242768 85 68.677 94.5
Y SGI 10242768 60.4 49.7 70
# MAC 11522870 75.6 68.7 100
# SUN 11522900 65.95 61.769 92.94
# SGI 11522900 70.05 71.736 105.6
# SGI 128021024 60 63.9 107.35
# VESA 128021024 60.02 64.286 108
# MAC 128021024 69.89 74.882 118.5
# HP 128021024 72.01 78.125 135
# VESA 128021024 75.03 79.976 135
# SUN 128021024 76.11 81.13 135
10242768 and 8322624 images are com-
pressed into 8002600 on LT81.
NOTE: Images marked with a # are not supported
by LT81. 
						

							103
01 Video 03H No Same as remote
02 RGB 04H No Same as remote
03 S-Video C6H No Same as remote
04 PC CARD 27H No Same as remote (available only when Viewer kit is connected to)
05 Power On 08H No Same as remote
06 Power Off 14H No Same as remote
07 Picture Mute 47H No Same as remote
08 Audio Mute 45H No
09 Onscreen Mute 11H No
10 Reset 43H No
11 D Up DEH No Same as remote
12 D Down DFH No Same as remote
13 D Right DCH No Same as remote
14 D Left DDH No Same as remote
15 D Right Up 21H No Same as remote
SPECIFICATIONS 104
PC Control Command Reference
Command Codes
No. Function Code Data Description
16 D Left Up 22H No Same as remote
17 D Right Down 23H No Same as remote
18 D Left Down 24H No Same as remote
19 Freeze 4CH No Same as remote
20 Slide + 4BH No Same as remote (available only when PC CARD is selected)
21 Slide Ð 20H No Same as remote (available only when PC CARD is selected)
22 Front Floor 33H No
23 Front Ceiling 34H No
24 Rear Floor 35H No
25 Rear Ceiling 36H No
26 Auto Start On 19H No
27 Auto Start Off 1AH No
28 Auto Picture On 1BH No
29 Auto Picture Off 1CH No
30 Input Mode Select 1DH Yes 0 Standard VIDEO (available only when VIDEO/S-VIDEO is selected)
1 Doc Camera
31 Gamma Select 1EH Yes 0 Normal
1 Natural 1
2 Natural 2 
						

							Command Codes (continued)
No. Function Code Data Description105
SPECIFICATIONS 106 32
Display Mode Select1FH Yes 0 Normal Aspect
1 Wide Aspect
33
Power Management On15H No
34
Power Management Off16H No
35 Digital Zoom W 89H No Same as remote
36 Digital Zoom T 8AH No Same as remote
37 Brightness 60H Yes 0 (00H) ÐÐ 63 (3FH)
38 Contrast 62H Yes 0 (00H) ÐÐ 63 (3FH)
39 Color 64H Yes 0 (00H) ÐÐ 63 (3FH)
40 Tint 66H Yes -32 (E0H) ÐÐ 31 (1FH)
41 Sharpness 68H Yes 0 (00H) ÐÐ 63 (3FH)
42 Audio Volume 6AH Yes 0 (00H) ÐÐ 63 (3FH)
43 Picture Adj 70H Yes -32 (
FFE0H) ÐÐ 31 (001FH)
44 Fine Picture 6EH Yes 0 (00H) ÐÐ 127 (7FH)
45 H Position 72H Yes -128 (80H) ÐÐ 127 (7FH)
46 V Position 74H Yes -64 (C0H) ÐÐ 63 (3FH)
47 Lamp Reset 3FH No
48 Lamguage Select 3DH Yes 0 English
1 German
2 French
3 Italian
4 Spanish
5 Swedish
6 Japanese
WHITE BALANCE
49 Sub Brightness R 75H Yes 0 (00H) ÐÐ 63 (3FH)
50 Sub Brightness G 76H Yes 0 (00H) ÐÐ 63 (3FH)
51 Sub Brightness B 77H Yes 0 (00H) ÐÐ 63 (3FH)
52 Sub Contrast R 78H Yes 0 (00H) ÐÐ 63 (3FH)
53 Sub Contrast G 79H Yes 0 (00H) ÐÐ 63 (3FH)
54 Sub Contrast B 7AH Yes 0 (00H) ÐÐ 63 (3FH) 
						

							Cable Connection
Communication Protocol
Baud rate: 9600 bps
Data length: 8 bits
Parity: No parity
Stop bit: One bit
X on/off: None
CommunicationsFull duplex
procedure:
If the CPU of the projector has received the data correctly, it returns an ACK(C5H). If the received data is not correct, the CPU returns a
NAK(CAH), then the following status:
Receiving success: C5
Receiving failure: CA Err
Err 01: Command Error (command not supported)
Err 02: Checksum Error
Err 03: Busy (command not acceptable)107
44 Err 04: Parameter Error ( parameter data abnormal)
1 2 54 36
7 8
To RxD of PC©PC Control Connector (DIN-8P)
NOTE:  If failing in powering-on, the CPU returns the following NAKs:
CA Err 1
Err 1 8X (Apply the corresponding bit.)
Bit 0: Lamp housing is not attached correctly
Bit 1: Fan stoppage
Bit 2: Overheated
Bit 3: Lamp lighting failure
To TxD of PC§To GND of PC©
SPECIFICATIONS 108