ViewSonic CD4220 User Guide - Page 53

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 that defines the value Set-Function format: Name Byte Count Bytes order Length 1 Byte 1 Command Value1 Value2 Value3 CR 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte 2 3 4 5 6 All Set-Function from PC to Monitor (ASCII) Name Length Command Value1 Value2 Value3 CR Byte Count 5 1 Byte 1 Byte 1 Byte 1 Byte 00D Bytes order 1 2 3 4 5 6 Example: Set Mute-ON command (ASCII) Name Length Command Value1 Value2 Value3 CR Byte Count 5 6 0 0 0 00D Bytes order 1 2 3 4 5 6 Example: Set Mute-OFF command (ASCII) Name Length Command Value1 Value2 Value3 CR Byte Count 5 6 0 0 1 00D Bytes order 1 2 3 4 5 6 Example: Set Tint to 50 command (ASCII) Name Length Command Value1 Value2 Value3 CR Byte Count 5 ' 0 5 0 00D Bytes order 1 2 3 4 5 6 LCD Monitor will send "+" (02Bh) and "CR" bytes to PC after receiving a valid command. LCD Monitor will send "-" (02Dh) and "CR" bytes to PC if the command is not valid. Value Range: Three bytes ASCII value range Command Code: Function command code in ASCII CD4620/CD4220 set command table Set Function Length Command Code (ASCII) Power 5 ! Input Select 5 " Contrast 5 # Command Code (Hex) 21 22 23 Value Range (Three ASCII bytes) 000: STBY 001: ON 000 : VGA 001 : HDMI1 002 : HDMI2 003 : AV 004 : YPbPr 005 : S-Video 000 ~ 100 Comments Controlled power status: ON or Standby ViewSonic CD4220 51