Protocol - ViewSonic VS16294 User Manual

3. Protocol

3.1 Set-Function Listing
The PC can control the TV/DS for specific actions. The Set-Function command
allows you to control the TV/DS behavior in a remote site through the RS232 port.
The Set-Function packet format consists of 9 bytes.
Set-Function description:
Length: Total Byte of Message excluding "CR"
TV/DS ID:
Identification for each of TV/DS (01~98; default is 01)
ID "99" means to apply the set command for all connected displays.
Under such circumstances, only ID#1 display has to reply.
The TV/DS ID can be set via the OSD menu for each TV/DS 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]
1. The reply for "Power on" command is the exception for VT2405LED-1 and
VT3205LED. It's 0x322B0D ( 2+<CR>).
2. When PC applies command to all displays (ID=99), only the #1 set needs to reply
by the name of ID=1.
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
ID Command Type Command
1 Byte
4
ID Command Type
1 Byte 1 Byte
4
ID Command Type Command
0x73
ID Command Type
27
Value1 Value2
1 Byte 1 Byte 1 Byte
5 6 7
CR
5
Value1 Value2
0x24 0x30 0x37
CR
Value3 CR
1 Byte 1 Byte
8 9
Value3 CR
0x36 0x0D