Communications: electrical – Continuously variable indicating – With meter reading
Patent
1996-05-10
1998-11-03
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34082543, 340518, 34082578, 307 41, 364264, G08B 2500
Patent
active
058315462
ABSTRACT:
An automatic addressing scheme for a life safety system having a local rail, and a plurality of modules inter-connected by the local rail, a first of the modules being a central processing unit, and the remainder being I/O modules having a variety of functions, as well as a common line forming part of the local rail; an arrangement is provided for detecting the location of each of the I/O modules and assigning addresses thereto without human intervention, the arrangement including a resistor and transistor, capable of being conductive to ground, associated with each I/O module. A constant current source is located at the central processing unit, connected by the common line to the resistors in series circuit, and with a common address input means connected from the central processing unit to said common line and thereby to the I/O modules. Further there is an arrangement for providing a cycle of voltage measurements in which successive variable voltage drops are measured from the CPU to the particular transistor actually conducting to ground.
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Costa Hilario S.
Munn Donald J.
General Signal Corporation
Wilson Jr. William H.
Zimmerman Brian
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