Pelco

PTZ protocols 
http://www.youtube.com/watch?v=MsYzR3Q4aSo PELCO protocol 
http://commfront.com/RS232_Examples/CCTV/Pelco_D_Pelco_P_Examples_Tutorial.htm
http://www.ikalogic.com/forums/viewtopic.php?f=3&t=480 Basic rs485 to rs232 conversion. 
http://www.codeforge.com/article/21109
=== Links ===
Microcontroller