Automatic configuration of a control module for a lighting fixture

A control module for controlling a control device of a load control system, wherein the control device is configured to control an electrical load, the control module comprising:

• a first electrical terminal, a second electrical terminal, a third electrical terminal, and a fourth electrical terminal;
• a first wired communication circuit coupled to the third and fourth electrical terminals and configured to communicate with the control device;
• a second wired communication circuit coupled to the first and second electrical terminals and configured to communicate with the control device;
• a control circuit;
• and
• a power supply configured to receive power via the first and second electrical terminals and generate a supply voltage for powering the control circuit;
• wherein the control circuit is configured to:
• control a magnitude of a voltage across the first and second electrical terminals using the second wired communication circuit;
• and
• determine whether to communicate with the control device using the first wired communication circuit or the second wired communication circuit based on a response caused by the control of the magnitude of the voltage across the first and second electrical terminals.