... -interference ability,max transmission distance 1200M3. Max 16pcs of subsidiary keyboard controllers 4. Password lock function5. Key beep switch function6. PTZ ... 0-254CommunicationRS485 half duplex operationcascading qtyMax 16 pcs of subsidiary keyboard controllers, ID : 0-15joystick3D(up, down, left, right, zoom)Connection5PIN ...