H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/49, 379/57
H04M 3/10 (2006.01) H04M 3/24 (2006.01) H04Q 3/00 (2006.01)
Patent
CA 1041203
ABSTRACT A status detector control comprises temporary storage to receive a sense point address which is coupled to decoders to decode the particular sense point address. A second tem- porary storage is provided to store the status of an addressed sense point. An error register is provided to store an error signal when a fault detector is coupled to the circuit. A decoded address (units and tens) is coupled from the status detector control to a decoder driver which drives a status detector driver. If fault detection is provided in the cir- cuitry, it is coupled to the status detector driver circuitry. The status detector driver output is coupled through the sense points to a receiver. This receiver comprises a pulse trans- former with the secondary coupled to the sense points and coupled via three diodes to ground. A strobe signal produced by the status detector control strobes the primary of the pulse transformer which is output to Schmitt triggers. The output of the Schmitt triggers is coupled to a multiplexer with the de- coded address (hundreds and thousands) from the status detector control. The output of the multiplexer is coupled in the status detector control to store the status of the addressed sense points.
227986
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