| 摘要 |
PROBLEM TO BE SOLVED: To shorten time required for a synchronization processing in data transmission and reception by reporting the information of a reception clock synchronized with the transmission clock of a transmitter by using a phase locked loop by a receiver to the transmitter and adjusting the frequency of the transmission clock corresponding to it by the transmitter. SOLUTION: A transmission part 40 is composed of a transmission CPU 420, a memory unit 410, a transmission VCO 440, a data modulation part 430, a transmission side ROM 460 and a RAM 451. Corresponding to the transmission clock oscillated corresponding to a voltage applied to the transmission VCO 440 by the transmission CPU 420, the data modulation part 430 transmits synchronization data. For that, a printer part on a reception side executes a PLL processing, a reception VCO 833 is made to oscillate the reception clock synchronized with the transmission clock, the value of an input voltage corresponding to a reception clock frequency is reported from a reception part 80 to the transmission CPU 420 and the transmission CPU 420 compares it with an appropriate voltage value inside the transmission side ROM 460. |
