Control keyboard is the indispensable rear-end control device in integrated security system RS485 3D PTZ CCTV Keyboard Controller for High Speed Dome Camera3D PTZ CCTV Keyboard Controller Protocol Pelco-P/Pelco-D/HC DVR/DH DVRFrequency 2400,4800,9600,19200bpsCameras up to 128pcs Protocol Pelco-P/Pelco-D/HC DVR/DH DVRFrequency 2400,4800,9600,19200bpsCameras controlled up to 31pcs communication ...