A transmittingreceiving unit for asynchronous data transmission has a CRC unit and a transmission FIFO in a transmission path. The test arrangement includes a light emitting source arranged for selectively generating a plurality of predetermined optical signals for simulating virtual threats, and a plurality of optical guides for the simulation signals, directly coupled with the source and adapted to be connected to the aforementioned optical channels for selectively stimulating the threat warning unit. At the removal, wet etching is performed with an aqueous solution containing hydrofluoric acid, and acetic acid or isopropyl alcohol. 3 to 0, and each of c and d has a value of from 0. A first molecular patterned surface having one or more regions of the first functionalities and one or more regions of the second functionalities is formed. The system according to the present invention allows high-speed and stable data acquisition and data conversion and accurate and reliable data transmission, when the data amount is significant.