在linux环境下通过RS485串口实现对云台镜头的各种控制（包括摄像头的打开，关闭，各个方向的运动及运动速度，预设点，自动扫描，变倍，调焦，光圈，视角宽窄等等的各项控制）。(In the Linux environment through the RS485 serial port to achieve a variety of PTZ camera control (including camera open, closed, movement and movement speed, eac