The 480P from dbx is the power supply for the 480R remote control. The power supply also acts as the communication hub between the 480R and other units in a DriveRack network system.The unit communicates with the network master via DB-9 or RJ-45 connectors (wired in parallel), utilizing the RS485 protocol, and can support cable lengths of up to 4,000 feet.Key Features�Power supply and communication link for 480R remote�DB-9 and RJ-45 link connectors�RS232 port for connection to a PC�Includes internal universal power supply with selectable voltage |