A method for node communication for use in a rack system is provided. The method includes providing a detecting unit for connecting to the nodes via a circuit switching device; predefining a linked list in which a limit of times for the detecting unit to communicate with each of the nodes is set; sequentially selecting one node of the nodes so that the detecting unit is connected to the one node via the circuit switching device; adding an assigned communication parameter between the detecting unit and the one node selected to the linked list, wherein a number of times of communication corresponding to the assigned communication parameter is not greater than the limit of times; and performing communication between the detecting unit and the one node selected in accordance with the assigned communication parameter in the linked list.