Data processing: generic control systems or specific application – Specific application – apparatus or process – Specific application of temperature responsive control system
Reexamination Certificate
2008-12-18
2011-10-04
Patel, Ramesh (Department: 2121)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Specific application of temperature responsive control system
C700S300000, C713S300000, C713S310000, C318S599000, C318S811000
Reexamination Certificate
active
08032261
ABSTRACT:
A cooling system includes a fan unit having a terminal receiving a signal representative of a commanded fan speed and a terminal for receiving a signal representative of actual fan speed. A system controller is responsive to temperature and the actual fan speed, for producing control signals for fan to adjust fan speed in accordance with the temperature and the actual fan speed, for producing the control signals in one of a plurality of different predetermined two-wire communication protocols. The system includes a fan controller and a two-line communication bus coupling the control signals between the system controller and the fan controller. The fan controller detects the one of the plurality of predetermined two-wire communication protocols on the two-wire communication bus and provides, in accordance with such detection, one terminal of the fan unit with the commanded fan speed and transmits the signal representative of the actual fan speed to the system controller via the communication bus.
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Beauchamp Robert M.
Roux Phillip J.
EMC Corporation
Patel Ramesh
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