Mitsubishi HL2750D User Manual

LCD Projector

RS-232C cable

SERIAL

D-SUB 9-pin

D-SUB 9-pin

To RS-232C
terminal

HL2750U

Controlling the projector using a personal computer

This projector can be controlled by connecting a personal computer with RS-232C terminal.

PC-controllable functions:

• Turning the power ON or OFF

• Changing input signals

• Inputting commands by pressing the buttons on the control panel and remote control

• Menu setting

Connection

Important:

• Make sure that your computer and projector are turned off before connection.

• Boot up the computer rst, and then plug the power cord of the projector.
(If you do not follow this instruction, the Com port may not function.)

• Adapters may be necessary depending on the PC connected to this projector. Contact your dealer for details.

1) Interface

PROTOCOL RS-232C

BAUD RATE 9600 [bps]
DATA LENGTH 8 [bits]
PARITY BIT NONE
STOP BIT 1 [bit]
FLOW CONTROL NONE

This projector uses RXD, TXD and GND lines for RS-232C control.
For RS-232C cable, the reverse type cable should be used.

2) Control command diagram

The command consists of the address code, function code, data code, and end code. The length of the command
varies among the functions.

Address code Function code Data code End code
HEX 30h 30h Function Data 0Dh
ASCII ‘0’ ‘0’ Function Data

[Address code] 30h 30h (In ASCII code, ‘0’ ‘0’) xed.
[Function code] A code of each xed control move.
[Data code] A code of each xed control data (number) and not always indicated.
[End code] 0Dh (In ASCII code, ‘ ’) xed.

1

3) Control sequence

(1) Send the command from the personal computer to the projector.
(2) The projector will send a return command after it receives an end code. If the command is not received

correctly, the projector will not send the return command.
(3) The personal computer checks the command and conrms if the sent command has been executed or not.
(4) This projector sends various codes other than the return code. When having a control sequence by RS-232C,

reject other codes from the personal computer.

• During signal switching, the command may not take effect even when the projector sends the return command.

After signal switching completes, wait for the mode indication to disappear before sending the next command.

• When sending commands successively, wait to receive the return command of the current command before

sending a next command.

• Keep intervals of at least 400 ms between receipt of a return command and sending of a next command.

• Any commands will not be executed for 10 seconds after the power is turned on.

[Example] When turning the power ON. (Figures and symbols enclosed in quotation marks are ASCII codes.):

Sending commands

from the PC, etc.

30 30 21 0D
‘0’ ‘0’ ‘!’ ‘ ’

30 30 21 0D
‘0’ ‘0’ ‘!’ ‘ ’

Status code

from the projector

Description

Command for POWER ON

Command receipt conrmation
(Command echo back)

4) Operation commands (Not executable in stand-by mode. When the commands for input select are sent

while the splash screen is being displayed, the splash screen is only canceled.)

The operation commands are used for the basic operation setting of this projector. They may not be executed
while the signals are changed. The operation commands have no data codes.

Operation ASCII HEX Note
POWER ON ! 21h This command is invalid for 1 minute after the power is turned off.
POWER OFF " 22h This command is invalid for 1 minute after the power is turned on.
INPUT COMPUTER 1 _r1 5Fh 72h 31h
INPUT COMPUTER 2 _r2 5Fh 72h 32h

INPUT DVI _d1 5Fh 64h 31h

INPUT VIDEO _v1 5Fh 76h 31h
INPUT S-VIDEO _v2 5Fh 76h 32h

This command will not be executed in Stand-by mode or when the MUTE is executed.
This command will not be executed in Stand-by mode or when the MUTE is executed.
This command will not be executed in Stand-by mode or when the MUTE is executed.
This command will not be executed in Stand-by mode or when the MUTE is executed.
This command will not be executed in Stand-by mode or when the MUTE is executed.

[Example] When setting the input signal to COMPUTER 1. (Figures and symbols enclosed in quotation marks

are ASCII codes.):

Sending commands

from the PC, etc.

30 30 5F 72 31 0D
‘0’ ‘0’ ‘_’ ‘r’ ‘1’ ‘ ’

30 30 5F 72 31 0D
‘0’ ‘0’ ‘_’ ‘r’ ‘1’ ‘ ’

Status code

from the projector

Description

Command for setting the input signal
to COMPUTER 1
Command receipt conrmation
(Command echo back)

5) Volume commands (Not executable in stand-by mode. Possible only to read during muting.)

The volume commands are used for the volume setting of this projector with the value.

ITEM ASCII HEX VALUE

VOLUME VL 56h 4Ch 00–32

How to set the value

Use the ASCII or HEX code as shown below to set the value.

ASCII ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’ ‘8’ ‘9’
HEX 30h 31h 32h 33h 34h 35h 36h 37h 38h 39h

[Example] When setting the volume to 15. (Figures and symbols enclosed in quotation marks are ASCII codes.):

Sending commands

from the PC, etc.

30 30 56 4C 31 35 0D
‘0’ ‘0’ ‘V’ ‘L’ ‘1’ ‘5’ ‘ ’

30 30 56 4C 31 35 0D
‘0’ ‘0’ ‘V’ ‘L’ ‘1’ ‘5’ ‘ ’

Status code

from the projector

Description

Command for setting the volume

Command receipt conrmation
(Command echo back)

2

6) Keystone commands (Not executable in stand-by mode. Possible only to read during muting.)

The keystone commands are used for the keystone setting of this projector with the value. The value will vary
depending on the installation conditions, etc.)

ITEM ASCII HEX VALUE
KEYSTONE (vertical) KS 4Bh 53h ±35
KEYSTONE (horizontal) KSH 4Bh 53h 48h ±25

How to set the value

Use the ASCII or HEX code as shown below to set the value.

ASCII ‘+’ ‘-’ ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’ ‘8’ ‘9’
HEX 2Bh 2Dh 30h 31h 32h 33h 34h 35h 36h 37h 38h 39h

7) Mute commands (Not executable in stand-by mode.)

The mute commands are used for the mute setting of this projector with the 0 (30h) and 1 (31h).

ITEM ASCII HEX VALUE
MUTE MUTE 4Dh 55h 54h 45h 0 (OFF), 1 (ON)

8) Remote commands (Not executable in stand-by mode. When the remote commands are sent while the

splash screen is being displayed, the splash screen is only canceled.)
Some remote control operations can be achieved by the remote command codes. The remote commands have no

data codes.

Button’s name on remote ASCII HEX

+ VOLUME r06 72h 30h 36h

- VOLUME r07 72h 30h 37h
KEYSTONE r43 72h 34h 33h
EXPAND r02 72h 30h 32h

PinP r04 72h 30h 34h
MUTE ra6 72h 61h 36h

r53 72h 35h 33h
r2b 72h 32h 62h
r4f 72h 34h 66h
r59 72h 35h 39h

MENU r54 72h 35h 34h
ENTER r10 72h 31h 30h
AUTO POSITION r09 72h 30h 39h

STILL ra4 72h 61h 34h

ASPECT re2 72h 65h 32h
WALL SCREEN rd7 72h 64h 37h
CE re7 72h 65h 37h

[Example] When displaying the MENU selection bar. (Figures and symbols enclosed in quotation marks are

ASCII codes.):

Sending commands

from the PC, etc.

30 30 72 35 34 0D
‘0’ ‘0’ ‘r’ ‘5’ ‘4’ ‘ ’

30 30 72 35 34 0D
‘0’ ‘0’ ‘r’ ‘5’ ‘4’ ‘ ’

Status code

from the projector

Description

Command operating the same as the

MENU button
Command receipt conrmation
(Command echo back)

3

9) Password lock commands

The password lock commands control the password lock. The password lock enabling or disabling command
is sent with a 4 to 8-digit password comprised of any gures 1 to 4 added to the end of the data code. When
the password lock is enabled or disabled successfully, the projector sends a return command comprising the
data code, password, and “1” at the end. When enabling or disabling the password lock fails, it sends a return
command with “0” at the end. There is no reconrmation of the password. The password input command is for
enabling projection of image when password lock has been set to DISPLAY INPUT. The password input command
is sent with a 4 to 8-digit password comprised of any gures 1 to 4 at the end.

ITEM ASCII HEX VALUE

Password lock enabling/

disabling
Password input PASS 50h 41h 53h 53h ****

**** is a 4 to 8-digit password comprised of any gures 1 to 4.

[Example] When enabling the password lock of DISPLAY INPUT (in the case that the password is 123412):

Sending commands

from the PC, etc.
30 30 50 53 4C 4F 43 4B 31 31 32 33 34 31 32 0D
‘0’ ‘0’ ‘P’ ‘S’ ‘L’ ‘O’ ‘C’ ‘K’ ‘1’ ‘1’ ‘2’ ‘3’ ‘4’ ‘1’ ‘2’ ‘ ’

PSLOCK

50h 53h 4Ch 4Fh 43h 4Bh 0**** (UNLOCK), 1**** (DISPLAY INPUT),

2**** (MENU ACCESS), 3**** (SPLASH ID SCREEN)

Status code

from the projector

Command for enabling the

password lock of DISPLAY INPUT
30 30 50 53 4C 4F 43 4B 31 31 32 33 34 31 32 31 0D
‘0’ ‘0’ ‘P’ ‘S’ ‘L’ ‘O’ ‘C’ ‘K’ ‘1’ ‘1’ ‘2’ ‘3’ ‘4’ ‘1’ ‘2’ ‘1’ ‘ ’

Response informing that the

projector succeeded in enabling the

password lock of DISPLAY INPUT

Description

10)

Reading command diagram

The projectors operating status, such as POWER-ON/OFF and the currently selected input terminal, etc. can be

monitored.

ASCII HEX

Function Data (Receive) Function Data (Receive)
POWER ON vP 1 76h 50h 31h
POWER OFF vP 0 76h 50h 30h
INPUT COMPUTER 1 vI r1 76h 49h 72h 31h
INPUT COMPUTER 2 vI r2 76h 49h 72h 32h
INPUT DVI vI d1 76h 49h 64h 31h
INPUT VIDEO vI v1 76h 49h 76h 31h
INPUT S-VIDEO vI v2 76h 49h 76h 32h
POWER ON/OFF INPOSSIBLE vPK 0 76h 50h 4Bh 30h
POWER ON/OFF POSSIBLE vPK 1 76h 50h 4Bh 31h
NO SIGNAL SUPPLIED vSM 0 76h 53h 4Dh 30h
SIGNAL SUPPLIED vSM 1 76h 53h 4Dh 31h

Use the following commands to obtain the values of the items in the INFORMATION menu.

ITEM ASCII HEX VALUE
LAMP TIME (LOW) vLE 76h 4Ch 45h hhhhmm
RESOLUTION vRESO 76h 52h 45h 53h 4Fh HHHHxVVVV
VERTICAL FREQUENCY

HORIZONTAL FREQUENCY
SYNC. TYPE

vVFREQ
vHFREQ
vSYNCT

76h 56h 46h 52h 45h 51h
76h 48h 46h 52h 45h 51h

76h 53h 59h 4Eh 43h 54h

***.**
***.**

0 (NO SIGNAL), 3 (3wire), 4 (4wire),
5 (5wire), 6 (SCART)

“hhhh” and “mm” represent hours and minutes respectively.
“HHHH” and “VVVV” represent the horizontal and vertical resolutions respectively.

The PC sends the command without attaching the data code to it. On the other hand, the projector attaches to the
received command its current operating status as the data code and send it back to the PC.

[Example] When checking the currently selected input terminal (when the INPUT VIDEO is being selected):

Sending commands

from the PC, etc.

30 30 76 49 0D
‘0’ ‘0’ ‘v’ ‘l’ ‘ ’

30 30 76 49 76 31 0D
‘0’ ‘0’ ‘v’ ‘l’ ‘v’ ‘1’ ‘ ’

Status code

from the projector

Description

Command for checking the input

terminal

Check result (VIDEO)

4

11)

Menu setting commands (Not executable in stand-by mode except for some commands. Possible only to

read during muting.)
The menu setting commands are used for the menu setting of this projector. If the personal computer sends the

command without attaching the data code, the projector attaches to the received command its current setting
value as the data code and send it back to the PC.

ITEM ASCII HEX VALUE
COLOR ENHANCER CE 43h 45h 0 (AUTO), 1 (PRESENTATION), 2 (STANDARD),

3 (THEATER), 4 (sRGB), 5 (USER)
COLOR ENHANCER­USER-GAMMA MODE
COLOR ENHANCER­USER-RGB-COLOR
COLOR ENHANCER­USER-RGB-TINT
CONTRAST PP 50h 50h ±30
BRIGHTNESS QQ 51h 51h ±30
COLOR TEMP. A 41h 1 (STANDARD), 2 (HIGH), 3 (LOW), 4 (USER)
COLOR TEMP.-USER
(CONTRAST)
COLOR TEMP.-USER
(BRIGHTNESS)

COLOR T 54h ±10
TINT S 53h ±10

SHARPNESS R 52h ±5
NOISE REDUCTION NR 4Eh 52h 0 (OFF), 1 (ON)
CTI CTI 43h 54h 49h 0 (OFF), 1 (ON)
INPUT LEVEL IPL 49h 50h 4Ch ±5,

WALL SCREEN WS 57h 53h

WALL SCREEN (BEIGE)
WALL SCREEN (LIGHT BLUE)
WALL SCREEN (LIGHT GREEN)
WALL SCREEN (PINK)
LAMP MODE LM 4Ch 4Dh 0 (STANDARD), 1 (LOW)
AUTO POWER ON APON 41h 50h 4Fh 4Eh 0 (OFF), 1 (ON)
AUTO POWER OFF APOF 41h 50h 4Fh 46h 00 (OFF), 05, 10, 15, 30, 60
SPLASH SCREEN SS 53h 53h 0 (OFF), 1 (ON)
BACK COLOR BB 42h 42h 0 (BLACK), 1 (BLUE), 2 (IMAGE)
MUTE MODE MM 4Dh 4Dh 0 (BLACK), 1 (IMAGE)
IMAGE REVERSE IR 49h 52h 0 (OFF), 1 (MIRROR), 2 (INVERT), 3 (MIRROR INVERT)
ASPECT SC 53h 43h 0 (AUTO), 1 (16:9), 2 (REAL), 3 (FULL)
ASPECT (Position of 16:9
image)
PASSWORD FUNCTION

MENU POSITION MP 4Dh 50h 0 (Upper left), 1 (Lower right)
CINEMA MODE CINE 43h 49h 4Eh 45h 0 (OFF), 1 (AUTO)
VIDEO SIGNAL
(VIDEO only)
SET UP STU 53h 54h 55h 0 (AUTO), 1 (OFF), 2 (3.75%), 3 (7.5%)
SCART INPUT SRT 53h 52h 54h 0 (OFF), 1 (ON)
LANGUAGE LG 4Ch 47h 0 ( ), 1 (English), 2 (Español), 3 (Deutsch),

RESET ALL
MEMORY CALL MMC 4Dh 4Dh 43h 0 (AUTO), 1 (MEMORY1), 2 (MEMORY2)
HORIZ.POSITION HP 48h 50h + (increment), - (decrement)
VERT. POSITION VP 56h 50h + (increment), - (decrement)
FINE SYNC. FN 46h 4Eh 00–31
TRACKING TRK 54h 52h 4Bh + (increment), - (decrement)
COMPUTER INPUT CIN 43h 49h 4Eh 0 (RGB), 1 (YCBCR/YPBPR), 2 (AUTO)
OVER SCAN VOS 56h 4Fh 53h 00 (90%) – 10 (100%)

CEU1GS

CEU1C 43h 45h 55h 31h 43h ±10

CEU1T 43h 45h 55h 31h 54h ±10

P 50h ±30 ±30 ±30 (R, G, B)

Q 51h ±30 ±30 ±30 (R, G, B)

WSY 57h 53h 59h 1–5
WSB 57h 53h 42h 1–5
WSG 57h 53h 47h 1–5

WSP 57h 53h 50h 1–5

SCP 53h 43h 50h 0 (CENTER), 1 (UPPER), 2 (LOWER)

PSLOCK

VS 56h 53h 0 (AUTO), 1 (NTSC), 2 (PAL), 3 (SECAM), 4 (4.43NTSC),

RSTALL

43h 45h 55h 31h 47h 53h 0 (DYNAMIC), 1 (NATURAL), 2 (DETAIL)

For DVI input: +0 (NORMAL), +1 (ENHANCED)

0 (OFF), 1 (BEIGE), 2 (LIGHT BLUE), 3 (LIGHT GREEN),

4 (PINK), 5 (BLACK BOARD)

50h 53h 4Ch 4Fh 43h

4Bh

52h 53h 54h 41h 4Ch 4Ch

0**** (UNLOCK), 1**** (DISPLAY INPUT),

2**** (MENU ACCESS), 3**** (SPLASH ID SCREEN)

**** is a 4 to 8-digit password comprised of any

gures 1 to 4.

5 (PAL-M), 6 (PAL-N), 7 (PAL-60)

4 (Français), 5 (Italiano), 6 ( ), 7 ( ),

8 ( ), 9 (PORTUGUÊS)

*1

*1

*1

5

ITEM ASCII HEX VALUE
HOLD HLD 48h 4Ch 44h 0 (OFF), 1 (ON)
HOLD BEGIN HLB 48h 4Ch 42h 00–99
HOLD END HLE 48h 4Ch 45h 00–99
CLAMP POSITION CLP 43h 4Ch 50h 001–255
CLAMP WIDTH CLW 43h 4Ch 57h 01–63
VERT. SYNC VSC 56h 53h 43h 0 (AUTO), 1 (OFF)
LPF LPF 4Ch 50h 46h 0 (OFF), 1 (ON)
SHUTTER(U) SHU 53h 48h 55h 00–20
SHUTTER(L) SHL 53h 48h 4Ch 00–20
SHUTTER(LS) SHLS 53h 48h 4Ch 53h 00–20
SHUTTER(RS) SHRS 53h 48h 52h 53h 00–20

*1) Setting range differs depending on the input signals.

• Some commands are not executed depending on the input signal. The operational restrictions same as those
on the menu setting are applied. Refer to “Menu operation” in the User Manual for more details.

How to set the value

Use the ASCII or HEX code as shown below to set the value.

ASCII ‘+’ ‘-’ ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’ ‘8’ ‘9’
HEX 2Bh 2Dh 30h 31h 32h 33h 34h 35h 36h 37h 38h 39h

[Example 1] When setting the AUTO POWER ON to ON. (Figures and symbols enclosed in quotation marks are

ASCII codes.):

Sending commands

from the PC, etc.
30 30 41 50 4F 4E 31 0D
‘0’ ‘0’ ‘A’ ‘P’ ‘O’ ‘N’ ‘1’ ‘ ’

30 30 41 50 4F 4E 31 0D
‘0’ ‘0’ ‘A’ ‘P’ ‘O’ ‘N’ ‘1’ ‘ ’

Status code

from the projector

Description

Command for setting the AUTO
POWER ON to ON
Command receipt conrmation
(Command echo back)

[Example 2] When setting the CONTRAST R of the COLOR TEMP.-USER to +10, the CONTRAST G to 0, and the

CONTRAST B to -5. (Figures and symbols enclosed in quotation marks are ASCII codes.):

Sending commands

from the PC, etc.
30 30 50 2B 31 30 2B 30 30 2D 30 35 0D

‘0’ ‘0’ ‘P’ ‘+’ ‘1’ ‘0’ ‘+’ ‘0’ ‘0’ ‘-’ ‘0’ ‘5’ ‘ ’

30 30 50 2B 31 30 2B 30 30 2D 30 35 0D

‘0’ ‘0’ ‘P’ ‘+’ ‘1’ ‘0’ ‘+’ ‘0’ ‘0’ ‘-’ ‘0’ ‘5’ ‘ ’

Status code

from the projector

Description

Command for setting the picture

control

Command receipt conrmation
(Command echo back)

[Example 3] When checking the TINT setting (when the TINT is set to +10). (Figures and symbols enclosed in

quotation marks are ASCII codes.):

Sending commands

from the PC, etc.

30 30 53 0D
‘0’ ‘0’ ‘S’ ‘ ’

30 30 53 2B 31 30 0D

‘0’ ‘0’ ‘S’ ‘+’ ‘1’ ‘0’ ‘ ’

Status code

from the projector

Description

Command for checking the TINT

setting

Check result (+10)

[Example 4] When setting the GAMMA MODE of the COLOR ENHANCER-USER to DETAIL. (Figures and symbols

enclosed in quotation marks are ASCII codes.):

Sending commands

from the PC, etc.

30 30 43 45 55 31 47 53 32 0D
‘0’ ‘0’ ‘C’ ‘E’ ‘U’ ‘1’ ‘G’ ‘S’ ‘2’ ‘ ’

30 30 43 45 55 31 47 53 32 0D
‘0’ ‘0’ ‘C’ ‘E’ ‘U’ ‘1’ ‘G’ ‘S’ ‘2’ ‘ ’

Status code

from the projector

Description

Command for setting the picture

control

Command receipt conrmation
(Command echo back)

6