| 摘要 |
PURPOSE:To transmit and receive an exact data, by controlling so that a printing data received from the center is sent out to a printing device, when a transmitting and receiving flag shows that the center is not under communication, and eliminating a noise in case of communication of the center. CONSTITUTION:In accordance with a data request instruction, a data from a center 8 is extracted by an acoustic coupler control part 12, and is stored in a buffer BUF1. Thereafter, the control part 12 outputs a data reception completing signal to a device control part 10, sends out a data request instruction to the center 8 and stores a receiving data in a buffer BUF2. Subsequently, the control part 12 informs this data storage to the control part 10, and thereafter, resets a communication flag F. When the flag F of the control part 12 is reset, this control part 10 outputs a printing data stored in a buffer PDB to a printer control part 11. |
