Sanyo PLC-XC56 - 3100 User manual

BASIC SERIAL COMMAND SPECIFICATIONS
PLC-XC56
Ver.1.00
SANYO Electric Co., Ltd
DS Company
Projector Division

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−CONTENTS −
1. Overview .........................................................................................................................3
2. Serial Interface Specifications......................................................................................3
2.1. Transfer Specifications ..........................................................................................3
2.2. Connection ..............................................................................................................3
3. Notes for Communication.............................................................................................4
4. Functional Execution Command Table........................................................................5
5. Status Read Command Table........................................................................................7
6. Functional Execution Command..................................................................................8
6.1. Format......................................................................................................................8
6.2. Command Pipelining..............................................................................................8
6.3. Transfer Example....................................................................................................8
6.4. Operation Requirements........................................................................................9
6.5. POWER ON Command ........................................................................................ 10
6.6. POWER OFF Command （Quick Power OFF）............................................... 10
6.7. POWER OFF Command....................................................................................... 10
6.8. Computer 1 Command ........................................................................................ 10
6.9. Computer 2 Command ........................................................................................ 10
6.10. Video Command....................................................................................................11
6.11. VOLUME + Command...........................................................................................11
6.12. VOLUME – Command...........................................................................................11
6.13. AUDIO MUTE ON Command................................................................................11
6.14. AUDIO MUTE OFF Command ..............................................................................11
6.15. VIDEO MUTE ON Command ............................................................................... 12
6.16. VIDEO MUTE OFF Command.............................................................................. 12
6.17. Screen Normal size Command........................................................................... 12
6.18. Screen Wide size Command............................................................................... 12
6.19. Image Standard Command ................................................................................. 12
6.20. Image Real Command ......................................................................................... 12
6.21. Image Cinema Command.................................................................................... 13
6.22. Image1 Command................................................................................................ 13
6.23. Image2 Command................................................................................................ 13
6.24. Image3 Command................................................................................................ 13
6.25. Image4 Command................................................................................................ 13
6.26. Image Blackboard (Green) Command ............................................................... 13
6.27. Image Dynamic Command.................................................................................. 13
6.28. MENU ON Command ........................................................................................... 14
6.29. MENU OFF Command.......................................................................................... 14
6.30. DISPLAY CLEAR Command................................................................................ 14
6.31. BRIGHTNESS + Command.................................................................................. 14

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6.32. BRIGHTNESS – Command.................................................................................. 14
6.33. IMAGE (Toggle) Command.................................................................................. 15
6.34. ON START Setting Command............................................................................. 15
6.35. ON START Cancel Command ............................................................................. 15
6.36. Power Management Ready Command .............................................................. 15
6.37. Power Management OFF Command.................................................................. 15
6.38. Power Management Shut down Command....................................................... 15
6.39. D.ZOOM + Command........................................................................................... 16
6.40. D.ZOOM – Command........................................................................................... 16
6.41. Computer1 S-Video Command........................................................................... 16
6.42. Image Colorboard Command ............................................................................. 16
6.43. POINTER RIGHT Command................................................................................ 16
6.44. POINTER LEFT Command .................................................................................. 16
6.45. POINTER UP Command ...................................................................................... 17
6.46. POINTER DOWN Command................................................................................ 17
6.47. ENTER Command ................................................................................................ 17
6.48. FREEZE ON Command........................................................................................ 17
6.49. FREEZE OFF Command...................................................................................... 17
6.50. Computer 1 Analog RGB Command.................................................................. 17
6.51. Computer 1 Scart Command.............................................................................. 18
6.52. Computer 1 Component Command................................................................... 18
6.53. AUTO PC ADJ. Command................................................................................... 18
6.54. PRESENTATION TIMER Command .................................................................... 19
6.55. KEYSTONE ↑Command....................................................................................... 19
6.56. KEYSTONE ↓Command....................................................................................... 19
7. Status Read Command............................................................................................... 20
7.1. Format................................................................................................................... 20
7.2. Transfer Example................................................................................................. 20
7.3. Operation Requirements..................................................................................... 20
7.4. Status Read Command........................................................................................ 20
7.5. Input Mode Read Command ............................................................................... 22
7.6. Lamp Time Read Command................................................................................ 22
7.7. Setting Read Command ...................................................................................... 23
7.8. Temp Read Command ......................................................................................... 23
7.9. Lamp Mode Read Command .............................................................................. 23

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1. Overview
1.1. These specifications define projector control commands for PLC-XC56.
1.2. The projector control commands are used to remotely control a projector through RS-232C from a
computer.
2. Serial Interface Specifications
2.1. Transfer Specifications
Item Specifications
Synchronous system Asynchronous
Transmission Speed 9600 / 19200
Data Length 8 bit
Parity N/A
Stop Bit 1
Flow Control N/A
1) Transmission speed: initial setting value is 19200.
2) Transmission speed can be changed in service mode.
2.2. Connection
Dedicated serial cable must be used for connection to a computer and a projector.
PC Projector
COM 1  Control Port
（D-Sub 9 Pin）（D-Sub 9 Pin）

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3. Notes for Communication
1. The projector control command is defined as one command/one line that starts with “C” and ends
with carriage return (0x0D).
2. There are two types of Commands: Functional Execution Commands and Status Read
Commands.
Example of Functional Execution Command: “C05” [CR]
Example of Status Read Command: “CR0” [CR]
3. When it takes more than one second to receive one command, it does not operate.
The information of buffer is cleared when it takes more than one second to receive carriage return
(0x0D) after the projector receives the first data “C”.
4. For Command pipelining, wait for the interval of 100ms after receiving a response.
More than 100ms
Command
PC →Projector “C” “0” “7” CR Next Command
Projector →PC ACK CR
Response
（Afew ms 〜5s）
3.4.1. When a command is issued before receiving a response, the function is not executed
properly.
3.4.2.Except for when there is no Response for more than 5 seconds.
5. It takes about 5 seconds for internal initialization after plugging in AC power. During this time, it
cannot process commands. Do not issue any command.
6. The number of characters of response to Status Read Commands depends on commands.
Please see [7. Status Read Commands].
7. Characters for commands must be Capital (A - Z).

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4. Functional Execution Command Table
Command
Item
Command
Item
C00 POWER ON C20 BRIGHTNESS +
C01
POWER OFF
（Quick Power OFF）C21 BRIGHTNESS -
C02 POWER OFF C22 ―――
C03 ――― C23 ―――
C04 ――― C24 ―――
C05 Computer 1 C25 Computer 2RGB
C06 Computer 2 C26 ―――
C07 Video C27 IMAGE （Toggle）
C08 ――― C28 ON START Enable
C09 VOLUME + C29 ON START Disable
C0A VOLUME - C2A Power Management Ready
C0B AUDIO MUTE ON C2B Power Management OFF
C0C AUDIO MUTE OFF C2C ―――
C0D VIDEO MUTE ON C2D ―――
C0E VIDEO MUTE OFF C2E Power Management Shut down
C0F Screen Normal size（4：3）C2F ―――
C10 Screen Wide size（16：9）C30 D.ZOOM +
C11 Image Standard C31 D.ZOOM -
C12 Image Real C32 ―――
C13 Image Cinema C33 ―――
C14 Image 1 C34 S-video
C15 Image 2 C35 ―――
C16 Image 3 C36 ―――
C17 Image 4 C37 ―――
C18 Blackboard C38 ―――
C19 Dynamic C39 Image Colorboard
C1A ――― C3A POINTER RIGHT
C1B ――― C3B POINTER LEFT
C1C MENU ON C3C POINTER UP
C1D MENU OFF C3D POINTER DOWN
C1E DISPLAY CLEAR C3E ―――
C1F ――― C3F ENTER
――― means no function.

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Command
Item
Command
Item
C40 ――― C80 ―――
C41 ――― C81 ―――
C42 ――― C82 ―――
C43 FREEZE ON C83 ―――
C44 FREEZE OFF C84 ―――
C45 ――― C85 ―――
C46 ――― C86 ―――
C47 ――― C87 ―――
C48 ――― C88 ―――
C49 ――― C89 Auto PC ADJ.
C4A ――― C8A PRESENTATION TIMER
C4B ――― C8B ―――
C4C ――― C8C ―――
C4D ――― C8D ―――
C4E ――― C8E KEYSTONE ↑
C4F ――― C8F KEYSTONE ↓
C50 Computer 1 Analog RGB C90 ―――
C51 Computer 1 Scart C91 ―――
C52 ――― C92 ―――
C53 ――― C93 ―――
C54 Computer 1 Component C94 ―――
C55 ――― C95 ―――
C56 ――― C96 ―――
C57 ――― C97 ―――
C58 ――― C98 ―――
C59 ――― C99 ―――
C5A ――― C9A ―――
C5B Computer 2 DVI (PC Digital) C9B ―――
C5C Computer 2 DVI (AV HDCP) C9C ―――
――― means no function.

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5. Status Read Command Table
Command Item Memo
CR0 Status Read
CR1 Input Mode Read
CR2 ―――
CR3 (Corresponding) Lamp Time Read
CR4 Setting Read
CR5 ―――
CR6 Temp Read
CR7 Lamp Mode Read
―――means no function.

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6. Functional Execution Command
6.1. Format
6.1.1PC issues a command in format as below.
“C” COMMAND [CR]
Command: two characters (See Basic Functional Execution Command Table)
     A projector changes received data to decode and returns a result after being
ready to receive next command.
[ACK]［CR］：（0x06、0x0D）When received Functional Execution Commands.
6.1.2“？”［CR］：When the received data cannot be decoded.
6.2. Command Pipelining
When some functions need the command pipelining, the performance is the same as that of the
remote control;
6.2.1. System: issues any command every 100 ms.
6.2.2. When receiving the appropriate command, the function is executed for 120 ms from the
moment.
6.2.3. When receiving the same command continuously within 120 ms, the function is executed
for another 120 ms from the moment.
6.2.4. When there is no incoming command after 120 ms, the execution of pipelining is stopped.
6.2.5. When the projector receives other incoming commands within 120ms, the execution of
pipelining is stopped.
6.3. Transfer Example
Switch the projector to video mode with Basic Command.
Command
PC →Projector “C” “0” “7” CR
Projector →PC     ACK CR
Processing
（Afewms 〜5s）

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6.4. Operation Requirements
1) When the projector’s status is any of below, Functional Execution Commands are limited.
Projector Status Available Functional Execution Commands
Standby Mode C00：POWER ON
Countdown in process C00：POWER ON →Countdown is terminated C01：POWER OFF
C02：POWER OFF →Countdown is terminated
Cooling Down in process NONE (No Execution)
Cooling Down due to Abnormal
Temperature NONE (No Execution)
Abnormal Temperature Status NONE (No Execution)
Abnormal Power Status NONE (No Execution)
Power Save / Cooling Down
in process
NONE
(No Execution)
Power Save Status C00：POWER ON
C01：POWER OFF
Input search：On1/On2 setting
Although transmit Input source commands, Input
search does not operate.
Note) When the status is as above, even if the projector receives other commands,
it returns [ACK] [CR].
2) When Eco mode is selected in Standby mode of Setting menu and projector is in Standby,
Functional Execution Commands are invalid.

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6.5. POWER ON Command
Command
“C00” [CR]
Detail
Power O
N
When already Power is ON, nothing is done.
When sending this command during processing Countdown, Countdown is
terminated.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.6. POWER OFF Command （Quick Power OFF）
Command
“C01” [CR]
Detail
Power OFF (
Standby)
When Power is OFF with ON/STAND-BY button of the projector and remote
control, “Power OFF?” is displayed. However, as soon as this command is sent,
Quick Power OFF is executed.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.7. POWER OFF Command
Command
“C02” [CR]
Detail
Power OFF (Standby).
The command operates the same Power OFF function as ON/STAND-BY button
of the projector and remote control.
Once this command is sent, “Power OFF?” is displayed. If this command is sent
again while it is displayed, Power OFF is executed.
When sending this command during Countdown, Countdown is terminated.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]
6.8. Computer 1 Command
Command
“C05” [CR]
Detail
Select Computer 1 Input
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.9. Computer 2 Command
Command
“C06” [CR]
Detail
Select Computer2 Input
Note 1) Although projector returns “OK”, Input search is not executed with this
command while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]

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6.10. Video Command
Command
“C07” [CR]
Detail
Select Video Input
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.11. VOLUME + Command
Command
“C09” [CR]
Detail
Volume Up.
This command operates the same way as “VOLUME+” button of the projector and
remote control.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.12. VOLUME – Command
Command
“C0A” [CR]
Detail
Volume Down
This command operates the same way as “VOLUME-” button of the projector and
remote control.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.13. AUDIO MUTE ON Command
Command
“C0B” [CR]
Detail
Sound Mute ON.
This command works the same way as “MUTE” button of the remote control for
Mute ON, but does not work for Mute OFF.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.14. AUDIO MUTE OFF Command
Command
“C0C” [CR]
Detail
Sound Mute OFF.
This command works the same way as “MUTE” button of the remote control for
Mute OFF, but does not work for Mute ON.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]

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6.15. VIDEO MUTE ON Command
Command
“C0D”[CR]
Detail
Video Mute ON.
This command works the same way as “NO SHOW” button of the remote control
for No Show ON, but does not work for No ShowOFF.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.16. VIDEO MUTE OFF Command
Command
“C0E” [CR]
Detail
Video Mute OFF.
This command works the same way as “NO SHOW” button of remote control for
No Show OFF, but does not work for No Show ON.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.17. Screen Normal size Command
Command
“C0F” [CR]
Detail
Set screen mode
to Normal.
This command is invalid while D.Zoom is in operation.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.18. Screen Wide size Command
Command
“C10” [CR]
Detail
Set screen mode to Wide
.
This command is invalid while D.Zoom is in operation.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.19. Image Standard Command
Command
“C11” [CR]
Detail
Set
image to Standard mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.20. Image Real Command
Command
“C12” [CR]
Detail
Set image to Real mode.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]

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6.21. Image Cinema Command
Command
“C13” [CR]
Detai
l
Set image to Cinema mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.22. Image1 Command
Command
“C14” [CR]
Detail
Set image to Image1 mode.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]
6.23. Image2 Command
Command
“C15” [CR]
Detail
Set
image to Image2 mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.24. Image3 Command
Command
“C16” [CR]
Detail
Set image to Image3 mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.25. Image4 Command
Command
“C17” [CR]
Detail
Set image
to Image4 mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.26. Image Blackboard (Green) Command
Command
“C18” [CR]
Detail
Set image to Blackboard (Green)mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.27. Image Dynamic Command
Comman
d
“C19” [CR]
Detail
Set image to Dynamic mode.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]

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6.28. MENU ON Command
Command
“C1C” [CR]
Detail
Display On
-
Screen Display Menu.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.29. MENU OFF Command
Co
mmand
“C1D” [CR]
Detail
Hide
On
-
Screen Display Menu.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]
6.30. DISPLAY CLEAR Command
Command
“C1E” [CR]
Detail
Hide On
-
Screen Display.
Hide On-Screen Display unconditionally.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.31. BRIGHTNESS + Command
Command
“C20” [CR]
Detail
Brightness of User Control +1.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.32. BRIGHTNESS – Command
Command
“C21” [CR]
Detail
Brightness of User Control
–
1.
Response
Accept
able
[ACK] [CR]
Unacceptable “？”[CR]
6.33. Computer 2 RGBCommand
Command
“C
25
” [CR]
Detail
Select Computer2
RGB
Input
Note 1) Although projector returns “OK”, Input search is not executed with this
command while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]

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6.34. IMAGE (Toggle) Command
Command
“C27”[CR]
Detail
Switch Image Setting status.
This command works the same way as “IMAGE” button of the remote control.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.35. ON START Setting Command
Command
“C28” [CR]
Detail
Enable Power ON Start.
This status is stored in EEPROM and retained regardless of Power OFF/ON.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.36. ON START Cancel Command
Command
“C29” [CR]
Detail
Disable Power ON Start.
This status is stored in EEPROM and retained regardless of Power OFF/ON.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]
6.37. Power Management Ready Command
Command
“C2A” [CR]
Detail
Set Power Management to Ready mode.
This status is stored in EEPROM and retained regardless of Power ON/OFF.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.38. Power Management OFF Command
Command
“C2B” [CR]
Detail
Set Power Management to OFF mode.
This status is stored in EEPROM and retained regardless of Power ON/OFF.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.39. Power Management Shut down Command
Command
“C2E” [CR]
Detail
Set Power Management to Shut down mode.
This status is stored in EEPROM and retained regardless of Power OFF/ON.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]

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6.40. D.ZOOM + Command
Command
“C30” [CR]
Detail
Enter Digital Zoom mode and expand image size.
This command works the same way as “D.ZOOM ▲” button of the remote control.
Response
Acceptable
[ACK
] [CR]
Unacceptable “？”[CR]
6.41. D.ZOOM – Command
Command
“C31” [CR]
Detail
EnterDigital Zoom mode and reduce image size.
This command works the same as “D.ZOOM ▼” button of the remote control.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.42. S-Video Command
Command
“C34” [CR]
Detail
Select S
-
Video input.
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.43. Image Colorboard Command
Command
“C3
9
” [CR]
Detail
Set
image to Colorboard mode
.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.44. POINTER RIGHT Command
Command
“C3A” [CR]
Detail
Move the Pointer of On
-
Screen Display Menu to the right.
This command works differently from the pointer “>” of the projector and remote
control, and has no function of Volume +.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.45. POINTER LEFT Command
Command
“C3B” [CR]
Detail
Move the Pointer of On
-
Screen Display Menu to the left.
This command works differently from the pointer “<” of the projector and remote
control, and has no function of Volume +.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]

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6.46. POINTER UP Command
Command
“C3C” [CR]
Detail
Move up the Pointer of On
-
Scre
en Display Menu.
This command works the same way as the pointer “▲” of the projector.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.47. POINTER DOWN Command
Command
“C3D” [CR]
Detail
Move down the Pointer of On
-
Screen Display Menu.
This command works the same way as the pointer “▼” of the projector.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.48. ENTER Command
Command
“C3F” [CR]
Detail
This command works the same way as “SELECT” button of the projector and
remote control.
Response
Accepta
ble
[ACK] [CR]
Unacceptable
“？”[CR]
6.49. FREEZE ON Command
Command
“C43” [CR]
Detail
Freeze on
-
screen image.
This command works the same way as “FREEZE” button of the remote control for
Freeze ON, but does not work for Freeze OFF.
Response
Acceptable
[ACK
] [CR]
Unacceptable “？”[CR]
6.50. FREEZE OFF Command
Command
“C44” [CR]
Detail
Cancel Freeze mode.
This command works the same way as “FREEZE” button of the remote control for
Freeze OFF, but does not work for Freeze ON.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.51. Computer 1 Analog RGB Command
Command
“C50” [CR]
Detail
Select Analog RGB
input in
Computer 1.
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
Acceptab
le
[ACK] [CR]
Unacceptable “？”[CR]

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6.52. Computer 1 Scart Command
Command
“C5
1
” [CR]
Detail
Select
Scart input in Computer 1
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
A
cceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.53. Computer 1 Component Command
Command
“C5
4
” [CR]
Detail
Select
Component
input in
C
o
mputer 1
.
Although projector returns “OK”, Input search is not executed with this command
while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.54. Computer 2 DVI (PC Digital) Command
Command
“C
5B
” [CR]
Detail
Select
DVI (PC Digital) of
Computer2 Input
Note) Although projector returns “OK”, Input search is not executed with this
command while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.55. Computer 2 DVI (AV HDCP) Command
Command
“C
5C
” [CR]
Detail
Select
DVI (AV HDCP) of
Computer2 Input
Note) Although projector returns “OK”, Input search is not executed with this
command while Input search is set to On1 or On2,
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.56. AUTO PC ADJ. Command
Command
“C89” [CR]
Detail
Execute Auto PC Adj. function.
This command operates the same as “AUTO PCADJ.” of main menu.
Projector suspends Auto PC Adj. operation when receiving this command another
time.
Response
Acceptable
[ACK] [CR]
Unacceptable
“？”[CR]

PLC
-
X
C56
Basic Serial Command Specifications
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6.57. PRESENTATION TIMER Command
Command
“C8A” [CR]
Detail
Execute Presentation Timer.
This command works the same way as “P-TIMER” button of the remote control.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.58. KEYSTONE ↑Command
Command
“C8E” [CR]
Detail
Correctkeystone distortion by reducing upper part of image.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]
6.59. KEYSTONE ↓Command
Command
“C8F” [CR]
Detail
Correctkeystone distortion by reducing down part of image.
Response
Acceptable
[ACK] [CR]
Unacceptable “？”[CR]