A data transmission device is provided. the data transmission device comprises a first device comprising a first memory; a second device comprising a plurality of sensors, a multiplexer to which data output from the plurality of sensors is input, and a counter connected to the multiplexer; a first transmission line configured to transmit a clock of a signal generator mounted on the first device or the second device to the second device or the first device; a second transmission line configured to transmit data output from the multiplexer according to an output from the counter of the second device to the first memory of the first device; and a third transmission line configured to transmit the output from the counter of the second device to the first device to enable the data transmitted to the first memory of the first device to be stored in a second memory or output.