Systems and methods for controlling combined initiating device and notification appliance circuits

1. A detection and alarm system, comprising:

a combined circuit including paired wires, one or more initiating devices, and one or more notification appliances communicatively coupled with the paired wires in parallel; and

a control panel having a controller communicatively coupled with the combined circuit, the controller configured to:

monitor the one or more initiating devices in a standby mode having a first polarity output on the paired wires;

maintain the one or more notification appliances in an off state in the standby mode;

detect an anomaly from an initiating device of the one or more initiating devices in the standby mode;

switch the combined circuit from the standby mode to an alarm mode having a second polarity output on the paired wires in response to the anomaly from the initiating device;

activate the one or more notification appliances in the alarm mode; and

maintain the one or more initiating devices in an off state in the alarm mode.

2. The detection and alarm system of claim 1 , wherein the controller is further configured to:

transmit a signal to control the one or more notification appliances in the alarm mode.

3. The detection and alarm system of claim 1 , wherein the alarm mode includes a first alarm mode having the first polarity output on the paired wires and a second alarm mode having the second polarity output on the paired wires, and

wherein the controller is further configured to switch between the first alarm mode and the second alarm mode such that the one or more initiating devices are monitored in the first alarm mode and the one or more notification appliances are active in the second alarm mode.

4. The detection and alarm system of claim 1 , further comprising:

an end-of-line resistor connected in parallel between the paired wires, wherein the one or more initiating devices and the one or more notification appliances are communicatively coupled along the paired wires between the end-of-line resistor and the controller.

5. The detection and alarm system of claim 1 , wherein the combined circuit is communicatively coupled with the controller at a primary interface, and

wherein the detection and alarm system further comprise a return line communicatively coupled with the combined circuit and the controller at a secondary interface.

6. The detection and alarm system of claim 1 , wherein the one or more initiating devices comprise one or more pull switches or one or more fire detectors.

7. The detection and alarm system of claim 1 , wherein the one or more notification appliances comprise one or more visual alarms or one or more audio alarms.

8. A method of controlling, by a control panel, a combined circuit including paired wires, one or more initiating devices, and one or more notification appliances communicatively coupled with the paired wires in parallel, the method comprising:

monitoring the one or more initiating devices in a standby mode having a first polarity output on the paired wires of the combined circuit;

maintaining the one or more notification appliances in an off state in the standby mode;

detecting an anomaly from an initiating device of the one or more initiating devices in the standby mode;

switching the combined circuit from the standby mode to an alarm mode having a second polarity output on the paired wires in response to the anomaly from the initiating device;

activating the one or more notification appliances in the alarm mode; and

maintaining the one or more initiating devices in an off state in the alarm mode.

9. The method of claim 8 , further comprising:

transmit a signal to control the one or more notification appliances in the alarm mode.

10. The method of claim 8 , wherein the alarm mode includes a first alarm mode having the first polarity output on the paired wires and a second alarm mode having the second polarity output on the paired wires, and

wherein the method further comprises switching between the first alarm mode and the second alarm mode such that the one or more initiating devices are monitored in the first alarm mode and the one or more notification appliances are active in the second alarm mode.

11. The method of claim 8 , wherein the combined circuit further includes an end-of-line resistor connected in parallel between the paired wires, wherein the one or more initiating devices and the one or more notification appliances are communicatively coupled along the paired wires between the end-of-line resistor and the control panel.

12. The method of claim 8 , wherein the combined circuit is communicatively coupled with the control panel at a primary interface, and

wherein the combined circuit further includes a return line communicatively coupled with the combined circuit and the control panel at a secondary interface.

13. The method of claim 8 , wherein the one or more initiating devices comprise one or more pull switches or one or more smoke detectors.

14. The method of claim 8 , wherein the one or more notification appliances comprise one or more visual alarms or one or more audio alarms.

15. A non-transitory computer-readable medium storing instructions for controlling, by a control panel, a combined circuit including paired wires, one or more initiating devices, and one or more notification appliances communicatively coupled with the paired wires in parallel, the non-transitory computer-readable medium comprising instructions to:

monitor the one or more initiating devices in a standby mode having a first polarity output on the paired wires of the combined circuit;

maintain the one or more notification appliances in an off state in the standby mode;

detect an anomaly from an initiating device of the one or more initiating devices in the standby mode;

switch the combined circuit from the standby mode to an alarm mode having a second polarity output on the paired wires in response to the anomaly from the initiating device;

activate the one or more notification appliances in the alarm mode; and

maintain the one or more initiating devices in an off state in the alarm mode.

16. The non-transitory computer-readable medium of claim 15 , further comprising instructions to:

transmit a signal sent to control the one or more notification appliances in the alarm mode.

17. The non-transitory computer-readable medium of claim 15 , wherein the alarm mode includes a first alarm mode having the first polarity output on the paired wires and a second alarm mode having the second polarity output on the paired wires, and

wherein the non-transitory computer-readable medium further comprising instructions to switch between the first alarm mode and the second alarm mode such that the one or more initiating devices are monitored in the first alarm mode and the one or more notification appliances are active in the second alarm mode.

18. The non-transitory computer-readable medium of claim 15 , wherein the combined circuit further includes an end-of-line resistor connected in parallel between the paired wires, wherein the one or more initiating devices and the one or more notification appliances are communicatively coupled along the paired wires between the end-of-line resistor and the control panel.

19. The non-transitory computer-readable medium of claim 15 , wherein the combined circuit is communicatively coupled with the control panel at a primary interface, and

wherein the combined circuit further includes a return line communicatively coupled with the combined circuit and the control panel at a secondary interface.

20. The non-transitory computer-readable medium of claim 15 , wherein the one or more initiating devices comprise one or more pull switches or one or more smoke detectors, and the one or more notification appliances comprise one or more visual alarms or one or more audio alarms.