A patient-support apparatus (10) includes a mattress assembly (14) supported on a frame (12), the mattress assembly (14) including a coverlet (28) configured to provide low-airloss therapy to a patient supported on the patient-support apparatus (10). The patient-support apparatus (10) is articulable to a number of positions and includes a control network (410) which is responsive to movement of portions of the frame (12) to alter operational parameters of the frame (12) and mattress assembly (14).
