Protocol 2 : without id – VIEWSONIC CD4220 User Manual
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
Value1 Value2 Value3 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
Value1 Value2 Value3 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
Value1 Value2 Value3 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
Value1 Value2 Value3 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
Value1 Value2 Value3 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