Design wireless interface of CCTV PTZ camera

Hi, your request is ambiguous. If you want an encrypted wireless transmission of command and video signal the type of protocol can't be RS422. The RS422 protocol can tx/rx only the command and it is current based (need a cable). One of possibility is to use a bidirectional radio module with proprietary protocol but the fast and "easy" solution is to use wifi module wich can tx/rx data and command connected to uP can control PTZ command. It'is very important to know the transmission distance. On all case the budget is low for this application.