| 摘要 |
PURPOSE:To obtain an inexpensive communication system by applying period formation so that a communication period and a pause period are repeated alternately periodically in applying two-way communication to serial data between a master set and a slave set through a communication line. CONSTITUTION:In applying 2-way communication between the master set and the slave set, one communication section is formed by two communication areas P1, P2, and the areas P1, P2 are used respectively as transmission and reception areas of the master set. When the 1st master bit SB1 is generated from the master set at the area P1, transmission data is extracted from a microcomputer in the master set and transmitted to the slave set through a transmission line. When the 2nd start bit SB2 is generated from the master set at the area P2, it is detected by the slave set and data is transmitted from the slave set to the master set at a point of time of the SB2. The microcomputer executes other jobs than the communication at the pause period when the communication period is finished. The communication period and the pause period are repeated at prescribed period length. |
