| 摘要 |
PURPOSE:To facilitate wiring between a master machine and a slave machine and to shorten time for calling from the slave machine to the master machine by making retrieving of the slave machine from which call is made between a switch box and the master machine basing on number information of the switch box and slave machine stored beforehand in the master machine. CONSTITUTION:The master machine M side that received on information of a call switch S1 outputs number information of the switch box and slave machine in a memory 24 to a data line A by a signal processing device 20. In the switch box T, the switch box number is impressed by a comparator circuit 10 and compared with own switch box number. When they coincide, a coincidence signal is impressed to a decoder circuit 11. The circuit 11 decodes number information of the slave machine received by a transmitting-receiving circuit 9, and outputs to output terminals (a)-(m). Accordingly, a transmitting-receiving change-over circuit 15 is operated by output of a slave machine setting switch S4, and the circuit 9 becomes transmitting mode, and sends slave machine catching information to the master machine M side. The master machine reads out again the number information of the slave machine from a memory 24 to operate an indicator 10. As an ''H'' signal is outputted from latch circuit 3a under this condition, the master machine M side reads out next number information from the memory 24, and transmits to the switch box side. |
