Downhole safety switch and communication protocol

An addressable switch comprising:

• an electrical input and an electrical output, the electrical input being configured to communicate with a surface controller when a unique address is received by the electrical input from the surface controller;
• a downstream switch configured to connect or disconnect the electrical input to the electrical output when the unique address is received by the electrical input;
• a safety circuitry;
• a processor in electrical communication with the downstream switch and the safety circuitry;
• a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the processor to perform operations comprising:
• receiving, by the processor, a signal from the surface controller;
• sending, by the processor, the signal to the safety circuitry to arm a detonator, wherein the unique address is associated with the detonator;
• and
• generating, by the processor, orientation data, wherein downlink communication between the surface controller and the electrical input occurs via Hopped Frequency Shift Keying (HFSK) voltage-modulated signals;
• wherein a transport layer comprises a bit-stream with a Preamble, Sync, and Data Packet patterns, wherein the Data Packet pattern consists of Type, Address, Sequence, Command, Data, and Hash fields, wherein the HFSK alternates between four different frequencies, F1, F2, F3, and F4, with a change in frequency indicating a new bit, and wherein the Command comprises one of the following:
• request device ID and version;
• Poll device for status;
• Downstream Switch Enable (DSSE);
• ARM Detonator;
• and FIRE;
• and
• wherein the frequencies F1 and F2 are utilized for a Zero bit, and wherein the frequencies F3 and F4 are utilized for a One bit, excepting during the Preamble and Sync patterns.