Protocol - ViewSonic CDE4200-L User Manual

3. Protocol

3.1 Set-Function Listing
The PC can control the display for specific actions. The Set-Function command
allows you to control the display behavior in a remote sit through the RS232 port.
The Set-Function packet format consists of 9 bytes.
Set-Function description:
Length: Total Byte of Message excluding "CR"
ID: Identification for each of display
If we want to set all settings, ID can use "99" to achieve, and it will not
have Reply command on this function.
The ID can be set via the OSD menu for each set.
Command Type: Identify command type,
"s" (0x73h) : Set Command
"+" (0x2Bh) : Valid command Reply
"-" (0x2Dh) : Invalid command Reply
Command: Function command code: One byte ASCII code
Value[1~3]:
Three bytes ASCII that defines the value
CR: 0x0D
Set-Function format:
Send: (Command Type= "s")
Name Length
Byte Count 1 Byte 2 Byte
Bytes order 1 2~3
Reply: (Command Type= "+" or "-")
Name Length
Byte Count 1 Byte 2 Byte
Bytes order 1 2~3
[NOTE] The reply for "Power on" command is the exception. It's 0x322B0D (
2+<CR>).
Example1: Set Brightness as 76 for TV-02 and this command is valid
Send (Hex Format)
Name Length
0x30
Hex 0x38
0x32
Reply (Hex Format)
Name Length
0x30
Hex 0x34
0x32
ID Command Type Command
1 Byte
4
ID Command Type
1 Byte 1 Byte
4
ID Command Type Command
0x73
ID Command Type
0x2B
27
Value1 Value2
1 Byte 1 Byte 1 Byte
5 6
CR
5
Value1 Value2
0x24 0x30 0x37
CR
0x0D
Value3 CR
1 Byte 1 Byte
7 8 9
Value3 CR
0x36 0x0D