http://support.dell.com/.../1800MPrs232.pdf
DellTM 1800MP RS232 Protocol Pin Assignment (Facing ... To pop up the OSD menu and adjust the ... • Control command Syntax (From PC to ... Example: Power ON Command (Send low byte firstly) ... --> 0xBE, 0xEF, 0x10, 0x05, 0x00, 0xC6, 0xFF, 0x11, 0x11, ...