发明名称 |
Single-wire loop alarm system |
摘要 |
A single-wire loop alarm system in which an identification module is placed across each alarm switch. Any module which is across an open switch is powered by the loop current and, in response to a pulse count in the loop representing its address, changes the loop impedance in order to report on its status. The loop current may alternate in direction so that oppositely poled modules may be used, thus allowing a larger number of powered modules to accommodated at the same time.
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申请公布号 |
US4751498(A) |
申请公布日期 |
1988.06.14 |
申请号 |
US19860838595 |
申请日期 |
1986.03.11 |
申请人 |
TRACER ELECTRONICS, INC. |
发明人 |
SHALVI, RAM;TEICH, RUDOR M.;GUILLAUME, KEITH |
分类号 |
G08B25/01;G08B26/00;(IPC1-7):G08B25/00 |
主分类号 |
G08B25/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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