UPS signaling state

A method for sending a power down signal from a Uninterruptible Power Supply (UPS) to a system receiving AC power from said UPS comprising the steps of:

• coupling said power down signal from said UPS to an input of a modulating circuit having a power line carrier protocol, said modulating circuit generating a modulated power down signal;
• coupling said modulated power down signal to an AC power cable coupling said AC power from said UPS to said system;
• coupling said modulated power down signal from said AC power cable to a demodulating receiving circuit having said power line carrier protocol, said demodulating receiving circuit regenerating said power down signal;
• coupling said power down signal from said demodulating receiving circuit to power down circuitry in said system for controlling a power down sequence for said system;
• determining if a source of a primary power line voltage coupled to said UPS meets an acceptable quality;
• and
• switching from said primary power line voltage to a secondary power line voltage in response to said determining step and generating said power down signal.

A system for sending a power down signal from an Uninterruptible Power Supply (UPS) to a system receiving AC power from said UPS comprising:

• an UPS receiving a primary power source and a secondary power source;
• circuitry for monitoring said primary power source and generating a power down signal in response a quality of said primary power source;
• circuitry for modulating a carrier signal with said power signal generating a modulated power down signal;
• circuitry for coupling said modulated power down signal to a power cable supplying AC power to said system from said UPS;
• circuitry for receiving and demodulating said modulated carrier signal to regenerate said power down signal;
• circuitry for coupling said power down signal to circuitry in said system for controlling power down sequencing said system in response to said power down signal;
• circuitry for determining if said primary power source coupled to said UPS meets an acceptable quality;
• and
• circuitry for switching from said primary power source to said secondary power source in response to said determining step.

A method for sending a power down signal from an Uninterruptible Power Supply (UPS) to a system receiving AC power from said UPS comprising the steps of:

• receiving a primary power source and a secondary power source in a UPS;
• monitoring said primary power source and generating a power down signal in response to a quality of said primary power source;
• modulating a carrier signal with said power signal thereby generating a modulated power down signal;
• coupling said modulated power down signal to a power cable supplying AC power to said system from said UPS;
• receiving and demodulating said modulated carrier signal to regenerate said power down signal;
• coupling said power down signal to circuitry in said system for controlling power down sequencing said system in response to said power down signal;
• controlling power down sequencing operations in said system in response to states of said power down signal
• determining if said source of a primary power line voltage coupled to said UPS meets an acceptable quality;
• and
• switching from said primary power source to said secondary power source in response to said determining step.