Self-checking cable type E.A.S. system

Details Self-checking cable type E.A.S. system Self-checking cable type E.A.S. system

1996-03-18

1998-02-03

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340516, 340572, G08B 1314

Patent

active

057149348

ABSTRACT:
An E.A.S. system capable of immediately making a decision on a broken condition of a tag 2 itself or its connection cable 8 or a non-connected condition of the connection cable 8 to a repeating device 1 at start-up of the system. The system comprises the repeating device 1 and a tag 2 detachably coupled through the connection cable 8 to the repeating device 1. The repeating device 1 is equipped with a jack 3 having a plug receiver 3a, a fixed contact 3b and a movable contact 3c, a pull-up resistor 4 coupled between the movable contact 3c and a power supply 10, a connection section for connecting the fixed contact 3b and the plug receiver 3a with a ground point, and a tag condition detecting section (5 to 7) coupled to the movable contact 3c. The tag 2 incorporates an internal resistor 2a, and a double pole plug 9 is detachably connected through the connection cable 8 with the jack 3. When the double pole plug 9 is separated from the jack 3, the movable contact 3c comes into contact with the fixed contact 3b, and when it is inserted into the jack 3, the movable contact 3c is separated from the fixed contact 3b.

REFERENCES:
patent: 4151520 (1979-04-01), Full
patent: 4716401 (1987-12-01), Wohlford et al.
patent: 5561417 (1996-10-01), Rothbaum et al.

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