Specifications

B
IPMI Commands and Managed Sensors
35
Types of sensors
TheRTMimplementsthefollowingtypesofsensors.
• Discrete—Adiscretesensorcanrepresentupto16states.Thesensoriscodedasa16‐bit
valuewithonebittrueandtheremainingbitsfalse.
• Digital—Adigitalsensorhastwopossiblestates,onlyoneofwhichcanbeactiveatany
giventime.Forexample,adigitalsensormonitoringthepowermayindicatewhetherthe
powerisgood(withinanacceptablerange)ornot.
• OEM—AnOEMsensorisan8‐bitvaluewithitsstatesdefinedbythemanufacturer.The
readingtypesofthesesensorsaresometimesdefinedas“sensor‐specific.”
• Threshold—Athresholdsensorhasarangeof256values,whichrepresent
measurementsontheRTManditsFRUs.Temperature,voltage,current,andfanspeed
sensorsareexamplesofthresholdsensors.
Table14showsthethresholddefinitions.
Table 14. Threshold types
Threshold type Description
UNR Upper non-recoverable thresholds generate a critical alarm on the high side.
UC Upper critical thresholds generate a major alarm on the high side.
UNC Upper non-critical thresholds generate a minor alarm on the high side.
LNC Lower non-critical thresholds generate a minor alarm on the low side.
LC Lower critical thresholds generate a major alarm on the low side.
LNR Lower non-recoverable thresholds typically generate a critical alarm on the low side.