| 摘要 |
PURPOSE:To shorten a call answering time by allowing a frame which is sent from a master station to each slave station to have a selective call signal having a flag at a bit position corresponding to the call number of the slave station, and letting the slave station answer at timing determined according to the number of flags before or after the flag of the slave station. CONSTITUTION:When the selective call signal is applied to an input terminal 1, a frame synchronizing signal detecting circuit 3 detects a frame synchronizing signal 112 and actuates a counter. The counter 4 begins to count when the frame synchronizing signal is detected according to a clock, and sends a pulse to an AND circuit 7 when its counted number reaches a value set by a number setting circuit 5. If a selective call signal part 113 is '1' at this time, the AND circuit 7 sends its output to a call detection output terminal 8 to indicate the slave station is called and when the selective call signal part 113 to '0', no signal appears at the call detection output terminal 8. |
