Abstract: A data transmission system and method and a method of selecting a communication path for a dual-controller system are provided, which are applied in a first controller and a second controller of the dual-controller system. First of all, a corresponding transmission medium is selected according to a feature of a data request issued by a controller, then the data request is converted into a data format compatible with a medium interface corresponding to the selected transmission medium and is sent to a corresponding medium driving portion connected with the medium interface, and the data request is sent to another controller through the medium driving portion and a connected corresponding medium controller, so as to select a path of the highest transmission performance, and realize the data transmission between the two controllers.

Abstract: An intranet IP address modification system and method for a dual controller, and is used to modify the intranet IP addresses dynamically under the condition of keeping an intranet based TCP connection of a dual controller from disruption and disconnection. Before modifying the intranet IP address, blocking all data transmission of an intranet connection simultaneously at both ends of the intranet connection of a dual controller; next, re-determining the network card IP's at both ends of the intranet connection based on a conflicting internet IP address; then, revising the intranet IP's and routing table according to the re-determined IP address, modifying correspondingly the remote terminal IP's in an ARP buffer storage and a corresponding MAC address, and modifying correspondingly portal IP address of the intranet connection; and finally, upon the completion of intranet IP address modification, resuming data transmission of the intranet connection simultaneously at both ends of the connection.

Abstract: A data transmission system and method and a method of selecting a communication path for a dual-controller system are provided, which are applied in a first controller and a second controller of the dual-controller system. First of all, a corresponding transmission medium is selected according to a feature of a data request issued by a controller, then the data request is converted into a data format compatible with a medium interface corresponding to the selected transmission medium and is sent to a corresponding medium driving portion connected with the medium interface, and the data request is sent to another controller through the medium driving portion and a connected corresponding medium controller, so as to select a path of the highest transmission performance, and realize the data transmission between the two controllers.