Its communication model should been an arbitrator-producer-consumer model. In this model, it is difficult for the parameters of the equipment to be setup, and it is difficult to change since have been set first.

• 它的通讯模型可看为仲裁者-生产者-消费者模型,在这种通讯模型中,设备的参数不容易设定,而且一旦设定无法改变的缺陷。