| 摘要 |
PURPOSE:To simplify the construction without using address signal generation circuits which are conventionally required, by assigning different count values to each unit group and by transmitting and receiving the data signal according to this assignment. CONSTITUTION:A reset pulse P20 and digital pulses P21, ...P2n are transmitted from an order unit 1. These pulses are counted by the counter installed on the transmission/reception units 30a, 30b-3na, 3nb of each unit group 20-2n. When the digital value corresponds to the assigned value of the unit group belonging to, transmission and reception are performed between the respective transmission/recept ionunits 30a and 30b and 3na and 3nb. By this reason, a special address signal generation circuit and an address signal reading circuit which are conventionally required, and not required and a general counter is sufficient instead of them. Construction becomes simple. |
