A load control system comprises a plurality of control devices, each coupled to one of a plurality of device communication links. The device communication links are each coupled to a one of a plurality of link power supplies, which provides power for the control devices on the device communication links. The link power supplies are coupled together via a repeater communication link and operate as repeater devices to retransmit digital messages received from the device communication link onto the repeater communication link, and vice versa. The retransmitted digital messages are substantially the same as the received digital messages. No control devices are coupled to the repeater communication link, such that no control devices draw current through the repeater communication link. A maximum of only two or three link power supplies are coupled between any two control devices of the load control system.