1. A load control device for use in a load control system for controlling an amount of power delivered from an AC power source to an electrical load, the load control system comprising a remote control device adapted to be coupled to the load control device via an electrical wire, the load control device comprising:a controllably conductive device adapted to be electrically coupled in series between the AC power source and the electrical load;
a control circuit configured to control the controllably conductive device to control the amount of power delivered to the electrical load using a forward phase control technique, the control circuit configured to render the controllably conductive device conductive at a transition time during a present half cycle of the AC power source and to render the controllably conductive device non-conductive at approximately the end of the present half cycle; and
a communication circuit adapted to be coupled to the electrical wire, the communication circuit configured to conduct a charging current for a power supply of the remote control device through the electrical wire, the communication circuit responsive to the control circuit to control the electrical wire between an active pull-up state and an active pull-down state to transmit a digital message to the remote control device via the electrical wire;
wherein the control circuit is configured to control the communication circuit to generate a high impedance state on the electrical wire when the communication circuit is not transmitting a digital message to the remote control device, the control circuit further configured to control the communication circuit to provide the active pull-up state on the electrical wire before or during the transition time of the controllably conductive device when the communication circuit is not transmitting a digital message to the remote control device.