Abstract: The temperature of shelves used in a food holding cabinet are measured using a transistor. The voltage across a PN junction being known to be temperature dependent, the shelf temperature can be inferred from a calculated temperature of a PN junction of a transistor thermally coupled to a heated or refrigerated shelf. No calibration of the measurement device is required since the PN junction voltage, current and temperature relationship is well known.

Abstract: The temperature of shelves used in a food holding cabinet are measured using a transistor. The voltage across a PN junction being known to be temperature dependent, the shelf temperature can be inferred from a calculated temperature of a PN junction of a transistor thermally coupled to a heated or refrigerated shelf. No calibration of the measurement device is required since the PN junction voltage, current and temperature relationship is well known.

Abstract: A universal food holding cabinet has multiple compartments, the temperatures of which are under software control by microprocessors or microcontrollers located on power supply circuit boards for corresponding compartments. Each compartment can have different temperature control requirements with different requirements being met by different programs in different processors, or different operating parameters for the same program. The cabinet is configured to prevent the power supply boards from being installed incorrectly, to provide an address to a power supply circuit board when it is installed and by which a power supply circuit can be addressed by a master controller to receive downloads of executable instructions and/or data.

Abstract: Bezels or escutcheons for a temperature-controlled food holding cabinet are removable and field replaceable by the use of interlocking tabs and detents that hold the escutcheon in place and align the escutcheon to electrical connectors. A tab formed on either the escutcheon or chassis of the cabinet, engages a corresponding detent formed on either the cabinet chassis or the escutcheon. Two tabs and detents are preferably used. One tab engages a corresponding detent with an interference fit.

Abstract: A universal food holding cabinet has multiple compartments, the temperatures of which are under software control by microprocessors or microcontrollers located on power supply circuit boards for corresponding compartments. Each compartment can have different temperature control requirements with different requirements being met by a different program in different processors, or different operating parameters for the same program. The cabinet is configured to prevent the power supply boards from being installed incorrectly, to provide an address to a power supply circuit board when it is installed and by which a power supply circuit can be addressed by a master controller.