ViewSonic CD4220 User Guide - Page 48

5. Protocol 1 : with ID 5.1 Command Description Length: TV ID Command Type Command: Value[1~3]: CR Total Byte of Message excluding "CR" Identification for each of TV Identify command type, "s" (0x73h) : Set Command "g" (0x67h) : Get Command "r" (0x72h) : Reply Command "p" (0x70h) : RCU Pass-through "+" (0x2Bh) : Valid command Reply "-" (0x2Dh) : Invalid command Reply Function command code: One byte ASCII code Three bytes ASCII that defines the value 0x0D 5.2 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 11 bytes. Set-Function description: Length: Total Byte of Message excluding "CR" TV ID Identification for each of TV If we want to set all TV settings, TV ID can use "99" to achieve, and it will not have Reply command on this function. Command Type Identify command type, "s" (0x73h) : Set Command 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 Byte Count Bytes order Length ID Command Type 1 Byte 2 Byte 1 Byte 1 2~3 4 Command 1 Byte 5 Value1 1 Byte 6 Value2 1 Byte 7 Value3 1 Byte 8 CR 1 Byte 9 Reply: (Command Type="+" or "-") Name Length ID Command Type CR Byte Count 1 Byte 2 Byte 1 Byte 1 Byte Bytes 1 2~3 4 5 order Example1: Set Brightness as 76 for TV-02 and this command is valid Send (Hex Format) Name Length ID Command Type Command Value1 Value2 Hex 0x38 0x30 0x32 0x73 0x24 0x30 0x37 Reply (Hex Format) Name Length ID Command Type CR Hex 0x34 0x30 0x32 0x2B 0x0D Value3 0x36 CR 0x0D Example2: Set Brightness as 176 for TV-02 and this command is NOT valid Send (Hex Format) Name Length ID Command Type Command Value1 Value2 Value3 CR ViewSonic CD4220 46