Initializing method and data transmitter

The preset 1st mode signal, a signal for maximum signal layer and minimum signal layer is alternating, wherein the alarm signal and preset 2nd mode signal of the signal for determining device presents a pre-formed. A plurality of data transfer unit (100) are fixed network, data transmission unit (100) transmitting unit (110) and data transfer unit (100) receiving unit (120) connected with the lower section; (110) and printer data transfer unit (100) for receiving unit (120) is section of the terminal is data transfer unit (100) transmission device. The preset 1st mode signal for receiving unit (120) to receiving and is synchronizing clocks; and a complete data transfer unit (100), synchronous with a preset 2nd mode signal from the transmitting unit (110) by the lower section of the data transmission unit (100); each 2nd preset mode signal line and signal levels' determining layer of receiving unit (120), according to receiving; the alarm data transfer unit (100) is an layer, which the transmission method of data.