Viewsonic CD4220 User Manual download pdf (Page 53)

6. Protocol 2 : without ID

6.1 Set function listing

The PC can control the LCD Monitor for specific actions. The Set-Function command allows you to

control the LCD monitor behavior in a remote sit through the RS232 port. The Set-Function packet

format consists of 5 bytes. Note that the “Value” byte is always = 00.

Set-Function description:

Length:

Total bytes of message = 5 ASCII (35H) excluding “CR”

Command:

Function command code: One byte ASCII code

Value[1~3]:

Three bytes ASCII that defines the value

Set-Function format:

Name

Length Command

alue1

alue2

alue3 CR

Byte Count 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte

Bytes order 1 2 3 4 5 6

All Set-Function from PC to Monitor (ASCII)

Name

Length Command

alue1

alue2

alue3 CR

Byte Count

5 1 Byte 1 Byte 1 Byte 1 Byte 00D

Bytes order 1 2 3 4 5 6

Example: Set Mute-ON command (ASCII)

Name

Length Command

alue1

alue2

alue3 CR

Byte Count

5 6 0 0 0 00D

Bytes order 1 2 3 4 5 6

Example: Set Mute-OFF command (ASCII)

Name

Length Command

alue1

alue2

alue3 CR

Byte Count

5 6 0 0 1 00D

Bytes order 1 2 3 4 5 6

Example: Set Tint to 50 command (ASCII)

Name

Length Command

alue1

alue2

alue3 CR

Byte Count

5 ‘ 0 5 0 00D

Bytes order 1 2 3 4 5 6

LCD Monitor will send “+” (02Bh) and “CR” bytes to PC after receiving a valid command.

LCD Monitor will send “-” (02Dh) and “CR” bytes to PC if the command is not valid.

Value Range: Three bytes ASCII value range

Command Code: Function command code in ASCII

CD4620/CD4220 set command table

Length Command Command Value Range Set Function

Code (ASCII) Code (Hex) (Three ASCII bytes)

Comments

000: STBY Power 5 ! 21

001: ON

Controlled power status: ON or

Standby

000 : VGA

001 : HDMI1

002 : HDMI2

003 : AV

004 : YPbPr

Input Select 5 “ 22

005 : S-Video

Contrast 5 # 23 000 ~ 100

ViewSonic CD4220 51

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Viewsonic CD4220 User Manual Page 53

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