Title:
EMERGENCY TELEPHONE INDIVIDUAL IDENTIFICATION DEVICE
Document Type and Number:
Japanese Patent JPH04281693
Kind Code:
A
Abstract:
PURPOSE: To make the device small through the adoption of a simple circuit and to ensure the high reliability.
CONSTITUTION: A voltage is applied to a resistive element 13 of each emergency telephone set 10 (1-n) from a DC power supply device through an individual signal line 15 and a current being an identification signal flowing through the resistive element 13 is detected by a resistive element 17 of a central device and a voltage amplifier 19 through the individual signal line 15 and an A/D converter 21 and a decoder 22 are used based on the detected current to identify the installed point of each emergency telephone set 10 (1-n).
Inventors:
SUZUKI YASUYUKI
NISHIKIGI KOUJI
FUKAZAWA MUNEAKI
NISHIKIGI KOUJI
FUKAZAWA MUNEAKI
Application Number:
JP4472191A
Publication Date:
October 07, 1992
Filing Date:
March 11, 1991
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H04B3/00; H04Q3/42; H04Q5/00; (IPC1-7): H04B3/00; H04Q3/42; H04Q5/00
Attorney, Agent or Firm:
Akira Kobiji (2 outside)