Pressure support device user interface

A method of operating a pressure support device to produce a pressurized flow of breathing gas for delivery to a patient, the method comprising:

• operably coupling an accessory to the pressure support device, wherein the pressure support device produces a pressurized flow of breathing gas for delivery to the patient;
• actuating a user interface disposed on a housing of the pressure support device, the user interface comprising a primary display, a secondary display that is physically separate and spatially apart from the primary display, and a single control, the primary display including one or more primary indicia indicative of one or more operating parameters of the pressure support device in a first mode of operation, the secondary display including one or more secondary indicia indicative of one or more operating parameters of the accessory in a second mode of operation, the secondary display being operational in response to the single control being operated in the second mode of operation and being non-operational in response to the control being operated in the first mode of operation, such that the entire secondary display is always substantially blank responsive to the single control being operated in the first mode of operation, wherein the primary display includes a number of primary indicia indicative of corresponding ones of the operating parameters of the pressure support device, wherein the secondary display includes a number of secondary indicia indicative of corresponding ones of the operating parameters of the accessory, wherein the secondary indicia include illuminable characters disposed on the secondary display, and wherein the pressure support device provides therapy to the patient during the first and second mode of operation;
• and
• manipulating the single control of the user interface, the single control being operable to:
• (a) adjust and select a corresponding one of the one or more operating parameters of the pressure support device in the first mode of operation, (b) adjust and select a corresponding one of the one or more operating parameters of the accessory in the second mode of operation, and (c) switch between the first mode of operation and the second mode of operation.