| 摘要 |
PROBLEM TO BE SOLVED: To easily perform authentication processing between a data communication device and a portable terminal, and to transmit data acquired by the data communication device to the portable terminal.SOLUTION: A data communication system includes: data communication devices 30a to 30c connected to a working machine 1 for acquiring data related to the working machine 1; and data communication devices 30c to 40d capable of receiving the data of the data communication device 30a to 30c by radio communication. The data communication system includes a permission determination part 34 for, on the basis of a correspondence relation between physical addresses on a network assigned to the data communication devices 30a to 30c and physical addresses on the network assigned to the data communication devices 30c to 40d, performing authentication processing between the data communication devices 30a to 30c and the data communication devices 30c to 40d to determine whether to transmit the data to the data communication devices 30c to 40d. |
