Disaster prevention system

• US 20070159980A1
• Filed: 01/11/2007
• Published: 07/12/2007
• Est. Priority Date: 01/12/2006
• Status: Active Grant

• Current Assignee: Nohmi Bosai Limited (Secom Company Limited)
• Original Assignee: Nohmi Bosai Limited (Secom Company Limited)
• Inventors: Yamaguchi, Yasuo
• Granted Patent: US 8,134,925 B2
• Time in Patent Office: Days
• US Class Current: 370/245
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/085 using central distribution transmission lines
• CPC Class Codes: G08B 25/14 Central alarm receiver or annunciator arrangements
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

Each terminal devices (1, 4) connected to one another via a LAN (11) includes: a main control portion (e.g. 31) performing operational control, a transmission LAN unit (34) performing transmission control regarding transmission and reception of disaster prevention information. The unit (34) includes: a transmitting and receiving circuit (36) connected to the portion (31); a transmission control portion (35) performing communication control; an arrival order determining and retransmitting circuit portion (37) connected to the portion (35) and to at least three of transmitting and receiving ports (38) which are capable of connecting to the LAN. Upon receiving an incoming signal of disaster prevention information from one of the portion (35) and the ports (38), the portion (37) outputs the received signal to the rest of them while shutting out for a predetermined period of time an incoming signal from the rest of the ports (38) that has sent the signal.

Claims

1. A disaster prevention system, comprising:

a LAN; and

a plurality of terminal devices including a fire receiver, said terminal devices being connected to one another via said LAN, wherein;

said plurality of terminal devices each comprises;

a main control portion for performing operational control; and

a transmission LAN unit for performing transmission control regarding transmission and reception of disaster prevention information;

said transmission LAN unit comprises;

a transmitting and receiving circuit directly connected to said main control portion;

a transmission control portion for performing communication control; and

an arrival order determining and retransmitting circuit portion connected to said transmission control portion and to at least three of transmitting and receiving ports which are capable of connecting to said LAN; and

said arrival order determining and retransmitting circuit portion, upon receiving an incoming signal relating to disaster prevention information from any one of said transmission control portion and the transmitting and receiving ports, outputs the received signal to the rest of said transmission control portion and the transmitting and receiving ports while shutting out for a predetermined period of time an incoming signal from the rest of the transmitting and receiving ports that has sent the signal.

2. The disaster prevention system according to claim 1, wherein:

said main control portion is provided with a necessary control unit in said terminal device through an arrangement of a bus, and exchanges signals with the control unit via the bus; and

said transmission LAN unit is connected to said main control portion via a signal line for directly exchanging signals.

3. The disaster prevention system according to claim 1, wherein said terminal device includes four transmitting and receiving ports.

4. The disaster prevention system according to claim 1, wherein at least one of said plurality of terminal devices has said main control portion connected to a line monitoring and control portion for monitoring and controlling for each line a connected device including a plurality of fire detectors connected to a plurality of lines.

5. The disaster prevention system according to claim 1, wherein at least one of said plurality of terminal devices has said main control portion connected to a transmission processing portion for performing a process of distributing disaster prevention information onto a different network, the disaster prevention information being based on a signal on the LAN.