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   Transmission from the computer starts with STX, then the command, parameter, and ETX are sent in this 

order. Add parameters according to the details of control. 

STX

C1 C2 C3

: 

P1 P2

Pn

ETX

End (1 byte)

Parameter 

(undefined length)

Colon(1 byte)

3 command 

characters (3 

bytes)

Start (1 byte)

*1 When transmitting a command which does not need a parameter, the operation (E) and parameter are not 

     necessary.

● If a command is transmitted after the lamp starts illuminating, there may be a delay in response or the command may not be 
   executed. Try sending or receiving any command after 60 seconds.
● When transmitting multiple commands, be sure to wait until 0.5 seconds has elapsed after receiving the response from the 
   projector before sending the next command. When transmitting a command which does not need a parameter, a colon (:) is 
   not necessary.

● If a command cannot be executed, the "ER401" response is sent from the projector to the computer.
● If an invalid parameter is sent, the "ER402" response is sent from the projector to the computer.
● STX and ETX are character codes. STX shown in hexadecimal is 02, and ETX shown in hexadecimal is 03.

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P5

P6

Operation (1  byte)
"=" (Value specified using parameter is set)

Same as basic format

STX

STX

C1

C2

C3

:

E

P1

P2

P2

P4

S5

S4

S3

S2

S1

Sub command (5  bytes)

Parameter (6  bytes)*1
Symbol "+" or "-" (1 byte) and set value or 

ad-justment value (5 bytes)

-70-

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[When connected to a computer]

 Projector

(<SERIAL IN> 

terminal) 

1

NC

NC

1

Computer

 (DTE specifications)

2

2

3

3

4

NC

NC

4

5

5

6

NC

NC

6

7

7

8

8

9

NC

NC

9

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When controlling the projector from a computer, the following commands are available.

[Projector control command]

PON

Power on

――――_

――

To check if the power is on, use the “Power query” 

command.

POF

Power standby

IIS

Select 

 Input

 signal

VID

SVD

RG1

RG2

HD1

CP1

MV1

UD1

VIDEO

S-VIDEO

RGB1

RGB2

HDMI

COMPONENT

MEMORY VIEWER

USB DISPLAY

AUU

Volume up

AUD

Volume down

OSH

AV mute function

_

Sending the command switches on/off. Do not 

switch on/off in a short period of time.

AMT

Mute function

0

Off

1

On

QPW

Power query

000

Standby

001

Power on

Q$S

Lamp condition query

0

1

2

3

Stand-by

Lamp ON control active

Lamp ON

Lamp OFF control active

PIN NO.

PORT NO.

 Signal Name

 Description

U18

PORTA0

EXTINT1

PHY break

O

T16

PORTA2

RST_RJ45

RJ45 network processing port is reset, low level is reset

O

R16

PORTA3

MONIT_OUT

Switch VGA2 

 Input / output status: 0_ Input, 1_output

O

T17

PORTA4

IRIS_CW

IRIS direction control

O

R17

PORTA5

P_KEY

On/Off button 

 Input port

I

T18

PORTA6

IRIS_RST

IRIS reset control

O

R18

PORTA7

IRIS_CLK

IRIS clock control

O

B22

PORTB0

OEFID_IN

LVDS 

Input 

 selection

O

F19

PORTB1

KEY_GPIO9

Android module control

O

D20

PORTB3

GPIO9

Android module control

O

A22

PORTB4

MCU_HPD0

HDMI hot plug control

O

M6

INR4

ON_2_5V

PWC878_2.5V voltage enabled, high level effective

O

M1

INR6

CXD_MUTE

Close 

Input 

O

M5

INR7

OUT_DET_EXT

AUDIO_OUT check

I

K4

INR9

LAMP_ECO

LAMP mode check

I

L2

ING2

TEMP_LED

Warning status LED

O

K3

ING3

POWER_LED_PW

Power indicator control

O

J4

ING4

READY_LED_PW

Ready indicator status

O

L1

ING5

LAMP_EN

Lamplighter enabled

O

K6

ING6

LAMP_S

Lamplighter control status

O

K2

ING7

USB_HUB_EN

USB HUB enabled

O

J5

ING9

MCU_HDMI

HDMI EDID write-in control (H:write. L: protection)

O

J1

INB2

ON_1_8V

PWC878 1.8V voltage enabled, high level effective

O

H4

INB3

ON_1_0V

PWC878 1.0V voltage enabled, high level effective

O

H6

INB4

FANC_SW

Group C fan voltage control, high level, voltage output

O

H3

INB5

ON_3_3V

PWC878 3.3V voltage enabled, high level effective

O

H2

INB6

ON_15V

CXA3828_15V voltage enabled, high level effective

O

H5

INB7

FAN_SW

Fan voltage control, high level, voltage output

O

G2

INB9

ON_16V

②5V power enabled, high level enabled

O

M3

INR0

P_OE

PT2830 control (L:MUTE, H:active)

O

L5

INR1

ROM_WP

IC1013 write protection control

O

K5

ING0

MOTOR_POWER

IRIS power supply enabled

O

J3

INB0

ON_5V

USB 5V control, high level effective

O

J2

INB1

ON_1.0V_PW

Control PW878's 1V voltage. H: active

O

U19

PORTI0

GPIOA0_4

External Android board control interface

O

V20

PORTI1

GPIOA0_9

External Android board control interface

O

W21

PORTI3

LAMP_EN_SEL

Point-to-signal control

O

U20

PORTI4

IRIS_DET

IRIS detection

I

W22

PORTI5

AUDIO_POWER

AUDIO power enabling port (H: ACTIVE)

O

V21

PORTI6

GPIOA0_5

Android board control interface

O

D12

PORTJ0

RC_SEL_FRONT

Enable front remote control

O

A13

PORTJ1

RC_SEL_BEHIND

Enable rear remote control

O

D11

PORTJ2

RST_GAM

Initialize CXD3551

O

B12

PORTJ3

TC_XCLR

Initialize CXDA3828

O

C11

PORTJ4

SD_MCU

Amplifier SD enabled (L: MUTE,H:ACTIVE)

O

E11

PORTJ5

VDDMNT

CXA3828 drive voltage switch control

O

F11

PORTJ6

PS

POWER OR VCOMRGB SW

O

A12

PORTJ7

IRIS_STBY

IRIS standby control

O

PW878 : LB360/ LB330/LW330/LW280

PW868 : LB300/LB280

SPL-1

Components indicated by a   mark have special significance to product safety. Please use the parts specified by 

the manufacturer for replacement. 

Before ordering the service parts, confirm the parts number with the Ref. No. in the parts list and the exploded view 

with the latest service manual in the service web site.