Power line communication receiver

A Power Line Communication (PLC) system comprising:

• a PLC sender;
• and
• a PLC receiver, connected to the PLC sender through power lines, configured to receive a power signal and command signal,
• wherein:
• when the PLC receiver receives the command signal from the PLC sender, the PLC receiver calculates time periods of each first level voltage signal and second level voltage signal, and records corresponding bits according to a time period of the time periods of each corresponding first level voltage signal and each corresponding second level voltage signal,
• when a time period of the time periods of the first level voltage signal or the second level voltage signal is a first time period, the PLC receiver records a first value,
• when a time period of the time periods of the first level voltage signal or the second level voltage signal is a second time period, the PLC receiver records a second value,
• the PLC receiver is a light emitting diode (LED) device, comprising:
• a processor unit;
• a memory unit, connected to the processor unit, and configured to store an identity code;
• an LED unit, connected to the processor unit, and
• when the PLC receiver receives the command signal, the processor unit records an address code and a lighting code contained in the command signal, and determines if the address code corresponds to the identity code stored in the memory unit, and if the address code corresponds to the identity code stored in the memory unit, the processor unit acknowledges the address code and controls the LED unit according to the lighting code.