A load control device for use in a load control system (500, 510) for controlling an amount of power delivered from an AC power source to an electrical load, the load control system (500, 510) 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, the control circuit configured to render the controllably conductive device conductive or non-conductive at a transition time during a half cycle of the AC power source; 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, 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, characterised in that the communication circuit is 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, H and in that the control circuit is further configured to control the communication circuit to provide the active pull-down state or the active pull-up state on the electrical wire during a period of time around the transition time of the controllably conductive device when the communication circuit is not transmitting a digital message to the remote control device. 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, the control circuit configured to render the controllably conductive device conductive or non-conductive at a transition time during a half cycle of the AC power source; 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, 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, characterised in that the communication circuit is 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, H and in that the control circuit is further configured to control the communication circuit to provide the active pull-down state or the active pull-up state on the electrical wire during a period of time around the transition time of the controllably conductive device when the communication circuit is not transmitting a digital message to the remote control device.