Profile: Dannovo Electronic Co.Ltd is a manufacturer of IP surveillance cameras and video conference cameras. Our keyboard controller is specially designed for video conference camera, which is completely compatible with VISCA protocol. It controls the rotation of speed dome camera and swinging angle of joystick with nonpolar variable speed control to embody speed dome camera rotating speed for real-time purposes. All input and output communication port utilizes anti-radar design, powerful anti-jamming performance and the standard transmitting distance is 1200 meters. RS485 control bus can control 255pcs head-end equipment address and connect 128pcs equipment in parallel at the most, as well as 7pcs series-connected to video conference camera.