ViewSonic Cd4220 Users Guide

5.3 Get-Function Listing  
The PC can interrogate the LCD Monitor for specific information. The Get-Function packet format 
consists of 5 bytes which is similar to the Set-Function packet structure. Note that the “Value” byte is 
always = 00. 
 
Get-Function description:    Length:   Total Byte of Message excluding “CR” 
TV ID  Identification for each of TV 
Command Type  Identify command type,   
“g” (0x67h) : Get Command 
Command:   Function command code: One byte ASCII code   
Value[1~3]:   Three...

Example3: Get Tint from TV-0007 and this command is valid.   
The Tint value is 32. 
Send (Hex Format)   
Name  Length  ID Command Type CommandValue1 Value2  Value3   CR  
Hex  0x38 0x30 0x37 0x67 0X65 0x30 0x30 0x30 0x0D 
Reply (Hex Format) 
Name  
Length  ID Command Type CommandValue1 Value2  Value3   CR  
Hex  0x38 0x30 0x37 0x72 0x65 0x30 0x33 0x32 0x0D 
 
Example4: Get Tint from TV-07 , but the Brightne
ss command ID is error and it is NOT in the 
command table. 
Send (Hex Format)   
Name   Length...

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...

Brightness   5 $  24 000 ~ 100      
Sharpness   5 %   25 000 ~ 100     
Color    5 &  26 000 ~ 100      
Tint    5 ‘  27 000 ~ 100      
Bass  5 .  2E 000 ~ 100  Sets Bass value 
Treble 5 /  2F 000 ~ 100  Sets Treble value 
Balance 5 0  30 000 ~ 100  Sets Balance position 
000 : 16:9 
001 : 4:3 
002 : ZOOM 
Picture Size   5 1  31 
003 : PANORAMA   
 
000 : English 001 : French 002 : Spanish 003 : Germany 004 : Italian 005 : Simplified Chinese 
OSD Language    55 2  32 
006 : Russian   
 
OSD timeout  5...

6.2 Get-Function Listing  
The PC can interrogate the LCD Monitor for specific information. The Get-Function packet format 
consists of 5 bytes which is similar to the Set-Function packet structure. Note that the “Value” byte is 
always = 00. 
 
Get-Function description :  
Length:   Total bytes of message = 5 ASCII (35H), excluding “CR” 
Command:   Get-Function command code: One byte ASCII code   
Value[1~3]:  Always = 000 
 
Get-Function format from PC to LCD (ASCII) 
Name   Length  Command
Value1...

 Length Command  CommandResponse Range 
Get Function   
  Code 
(ASCII)  Code (Hex)
(Three ASCII  bytes) Comments 
Get-Contrast   
 a  61 000 ~ 100    Gets Contrast value 
Get-Brightness     b  62 000 ~ 100    Gets Brightness value
Get-Sharpness     c  63 000 ~ 100    Gets Sharpness value
Get-Color     d  64 000 ~ 100    Gets Color value 
Get-Tint     e  65 000 ~ 100  Gets Tint value 
Get-Volume     f  66 000 ~ 100    Gets Volume value 
000: OFF (unmuted)Get-Mute    g  67 
001: ON (muted)  Gets Mute...

ViewSonic CD4220  55 
6.3  Remote Control Pass-through mode 
When PC sets the LCD monitor to Remote Control Pass through mode, the LCD shall send a three 
bytes packet (followed by “CR”) in response to RCU button activation. Note, that in this mode the RCU 
shall have no effect on the monitor function.  For example: “+Volume” will not change the volume in the 
LCD but only sends “+Volume” c ode to PC over the RS232 port. 
 
Remote Control pass-through packet format from LCD monitor to PC(ASCII) 
Name...