The utility model discloses a main many communication device from communications network, including a communication circuit and the 2nd communication circuit, a communication protocol and the 2nd communication protocol are supported enough simultaneously to host computer and follow function in addition, the host computer is connected with the machine of follow through a communication circuit and the 2nd communication circuit simultaneously. The utility model discloses pass through many bus connection with host computer and the machine of following, communication in time reliably, and is more timely effective to the processing of special event, can realize communication data's orderly high efficiency transmission moreover.