R

Rack mount UPS UPS that can be mounted in a rack along with servers, hubs, and other devices.

Rated Rectifier Current The maximum output current of a rectifier at 58V for a 48 V (nominal) rectifier, or 29 V for a 24 V (nominal) rectifier.

Rated System Current The sum of the rated rectifier currents in the power system.

Raw Power Electrical power which may or may not contain unwanted electrical signals.

Receptacle A contact device installed at an outlet designed to accept a single plug. Receptacles on the rear of a UPS accept plugs from supported system equipment such as computers or monitors.

Rectifier A module fitted to the power system that converts AC input power to regulated DC output power.

Rectifier Bus The bus to which the outputs of the rectifiers are connected.

Rectifier Magazine A module in the power system used to connect the rectifiers to other modules in the power system.

Rectifier Voltage The voltage to which the rectifiers are set. This is assumed to be the same for each rectifier and does not include current share adjustments.

Redundancy Duplication of elements in a system or installation to enhance the reliability or continuity of operation.

Regulation The act of limiting voltage – using various methods - to a set range.

Reserve Battery time remaining to end of discharge

RFI Radio Frequency Interference

RM Rectifier Magazine

RMS Route Mean Squared

RS-232 Also called serial ports; a method of communicating digital information in which the data bits are transmitted sequentially over one line.

RS-232C A common point-to-point hardware configuration for serial communications.

RS-485 A multi-drop hardware configuration for serial communications. There is no intrinsic method of bus collision detection in RS-485, so higher layers in the protocol stack must take this into account.