ViewSonic CDE4200-L User Manual page 41

3.2 Get-Function Listing
The PC can interrogate the display for specific information. The Get-Function packet
format consists of 9 bytes which is similar to the Set-Function packet structure. Note
that the "Value" byte is always = 00.
Set-Function description:
Length: Total Byte of Message excluding "CR"
ID: Identification for each of display
Command Type: Identify command type,
"g" (0x67h) : Get Command
"r" (0x72h) : 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
Get-Function format:
Send: (Command Type= "g")
Name Length
Byte Count 1 Byte 2 Byte
Bytes order 1 2~3
Reply: (Command Type= "r" or "-")
If the Command is valid, Command Type = "r"
Name Length
Byte Count 1 Byte 2 Byte
Bytes order 1 2~3
If the Command is Not valid, Command Type= "-"
Name Length
Byte Count 1 Byte 2 Byte
Bytes order 1 2~3
Example1: Get Brightness from TV-05 and this command is valid.
The Brightness value is 67.
Send (Hex Format)
Name Length
0x30
Hex 0x38
0x35
ID Command Type Command
1 Byte
4
ID Command Type Command
1 Byte
4
ID Command Type
1 Byte 1 Byte
4
ID Command Type Command
0x67
30
Value1 Value2
1 Byte 1 Byte 1 Byte
5 6 7
Value1 Value2
1 Byte 1 Byte 1 Byte
5 6 7
CR
5
Value1 Value2
0x62 0x30 0x30
Value3 CR
1 Byte 1 Byte
8 9
Value3 CR
1 Byte 1 Byte
8 9
Value3 CR
0x30 0x0D