Ioannis, I'n not aware of an industry-wide standard but different brands of cameras can generally be adapted to work on each others system. The first question would have to be--what brand of camera are you trying to control? We use both Pelco and Sensormatic at our airport but there's lots of other brands out there. Our switch is American Dynamics. Most of our cameras are controlled using ASCII streaming via Manchester but we're changing to RS422 for new installations. Most manufacturers make the control information available on their websites because they often have to interface with other systems like security and DVR.