Base loop code transmitter

Details Base loop code transmitter Base loop code transmitter

G - Physics

08

B

340/73

G08B 25/00 (2006.01) G08B 25/04 (2006.01)

Patent

CA 1094187

ED-195 BASE LOOP CODE TRANSMITTER ABSTRACT OF THE DISCLOSURE A solid state code transmitter adapted for use with a conventional local fire alarm system in connection with installa- tions that include a McCulloh loop circuit for the transmission of signals to a central proprietary fire alarm surveillance point; the transmitter circuit generates an electronic data word 17 bits long, the first 14 bits being field programmable by way of minia- ture DIP switches, each data word representing an equivalent of one round of generated code; during an ALARM input the transmitter circuit will generate four rounds of code, and will further gener- ate one round when the ALARM input is removed; during a TROUBLE input, the circuit will generate two rounds of code and one round when that TROUBLE input is removed; during simultaneaus ALARM and TROUBLE inputs, ALARM will take precedence; however, a one round restoration code will not be generated is either ALARM or TROUBLE inputs remain active while the other is removed, and upon removal of a second input (ALARM or TROUBLE), a one round restoration code will be generated.

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