发明名称 |
CONTINUITY-ISOLATION TESTING FOR CLASS A WIRING IN FIRE ALARM SYSTEM |
摘要 |
EU-244 CONTINUITY-ISOLATION TESTING FOR CLASS A WIRING IN FIRE ALARM SYSTEM An improvement is provided in a fire alarm system in which a large number of terminal units, comprising detectors and interface circuits, at a variety of locations are coupled or connected in separate, independent loops of the system, each of the scattered terminal units being addressable from a central control panel. The arrangement is such that serial synchronous power transmission and data communication is effectuated over the individual loop of the system. The improvement resides in providing continuity-isolation testing for a Class A wiring scheme involved in the loops. By Class A operation is meant that there are two separate channels involved in each loop. A continuity test is sequentially performed on both channels of the loop such that discontinuities can be precisely located.
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申请公布号 |
CA2013611(A1) |
申请公布日期 |
1990.11.01 |
申请号 |
CA19902013611 |
申请日期 |
1990.04.02 |
申请人 |
GENERAL SIGNAL CORPORATION & SIMON T. CARTER;CARTER, SIMON T. |
发明人 |
RIGHT, ROBERT W.;CARTER, SIMON T. |
分类号 |
G08B26/00;G08B29/06;(IPC1-7):G08B29/04 |
主分类号 |
G08B26/00 |
代理机构 |
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主权项 |
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地址 |
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