Title:
REMOTE EQUIPMENT CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP3437610
Kind Code:
B2
Abstract:
PURPOSE: To independently provide the loop constitution of plural terminal equipments and to easily switch the plural terminal equipments by switching a latch relay to the terminal equipment or a loop part for fault diagnosis by loop constitution control signals.
CONSTITUTION: A pulse detection part 2 detects the pulse signals of the loop constitution control signals constituted of at least more than two pulse signals supplied from an external controller 1 through communication channel side terminals L1 and L2. A pulse counting part 6 transmits driving operation signals to a latch relay part 7 when the predetermined number of the pulse signals arrive. The latch relay part 7 switches the terminal contact points of the latch relay 8 from A2 to B2 and from A1 to B1 by the driving operation signals and connects the loop part 9 to a communication channel system. Also, by cancellation operation signals from the pulse detection part 2, the terminal contact points are switched from B2 to A2 and from B1 to A1, the terminal equipment 10 is connected to the communication channel system and a state capable of normal communication is attained.
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Inventors:
Hideo Miura
Shigeru Nishizawa
Shigeru Nishizawa
Application Number:
JP24940293A
Publication Date:
August 18, 2003
Filing Date:
October 05, 1993
Export Citation:
Assignee:
Shirayama Manufacturing Co., Ltd.
International Classes:
H02J13/00; H04B3/46; H04M3/30; (IPC1-7): H04B3/46; H02J13/00; H04M3/30
Domestic Patent References:
| JP58103256A | ||||
| JP4109816A |
Attorney, Agent or Firm:
Yoshiharu Yoshida