Multiple location load control system

An electrical load remote control device, comprising:

• a remote accessory terminal communicatively couplable to a main accessory terminal on the main control device;
• an energy storage device;
• and
• remote controller circuitry communicatively coupled to the accessory terminal, the remote controller circuitry to:
• charge the energy storage device using the AC electrical input received from the main control device via the remote accessory terminal during a first portion of an AC cycle of the AC electrical input to the main control device;
• and
• bidirectionally communicate one or more binary messages via the remote accessory terminal during a second portion of the AC cycle of the AC electrical input to the main control device.

An electrical load main control device, comprising:

• a hot terminal to receive an alternating current (AC) electrical input;
• a dimmed hot terminal to provide an electrical output couplable to one or more electrical load devices;
• one or more controllably conductive devices disposed in series between the hot terminal and the dimmed hot terminal;
• a main accessory terminal operatively couplable to the AC electrical input;
• and
• main controller circuitry communicatively coupled to the one or more controllably conductive devices and the accessory terminal, the main controller circuitry to:
• bidirectionally communicate one or more binary messages to one or more remote control devices via the main accessory terminal during a second portion of the AC cycle of the AC electrical input.