The document discusses sensor device commands for getting and setting sensor readings, thresholds, hysteresis, and event enables according to the IPMI specification version 2.0. It includes examples of getting sensor readings in International Components for Unicode Transformation Format (ICTS) and calculating sensor values based on factors. Formulas and processes are provided for getting sensor statuses, thresholds, and event flags as well as setting hysteresis and thresholds.

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IPMI Specification V2.0
of Section 35
2011/5/23
As presented by Simon

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Section 35
• Sensor Device Commands

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Sensor Device Commands

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Get Sensor Reading(1/3)

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Get Sensor Reading(2/3)

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Get Sensor Reading(3/3)

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Get Sensor Reading in ICTS
Get Sensor Reading Factors0xC8 = MSB 1100 1000 LSB, at or above UNC

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Sensor Reading Conversion Formula

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Calculate
• x = 0xBC = 188
• M = 0xAB = 171
• B = 0
• K1 = 0
• K2 = 0xC = (1100)2= -(0100)= -4
• L[] see Full Sensor Record Byte 24, units see
Byte 21~23
• y=188*171*0.0001=3.2148 (V) Appendix

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Get Sensor Hysteresis

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Hysteresis

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Set Sensor Hysteresis

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Get and Set Sensor Hysteresis in
ICTS

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Get Sensor Thresholds
Need Readable Threshold Mask support in SDR

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Set Sensor Thresholds
1. Value in RAM not SDR
2. Need Settable Threshold Mask support in SDR

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Get and Set Sensor Thresholds

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Get Sensor Event Enable(1/2)

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Get Sensor Event Enable(2/2)
• Byte 3,4: Get Assertion Event Enable or not
• Byte 5,6: Get Deassertion Event Enable or not
• Note that internal event flags and scanning will
continue even though Event Message generation
is disabled, unless sensor scanning is disabled.

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Set Sensor Event Enable(1/2)
Need Event Mask support

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Set Sensor Event Enable(2/2)
• Byte 3,4: Select assertion event
• Byte 5,6: Select deassertion event

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Get and Set Sensor Event Enable in
ICTS
10: disable, 01: enable
E = 1110
D = 1101

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Auto Re-arm VS Manual Re-arm
• Auto Re-arm
• Manual Re-arm
Flag 0 0
1 1Flag
Threshold
Positive
Hysteresis
+1
Auto Re-arm

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Three OEM Commands
• Begin sensor test
• 0x20 0x2e 0x00 0xcc 0x5e 0x2b 0x00 0x04 0x40 0x00
• Set sensor data
• 0x20 0x2e 0x00 0xcc 0x5e 0x2b 0x00 0x04 0x40 0x01 [sensor
number] [threshold data]
• 0x20 0x2e 0x00 0xcc 0x5e 0x2b 0x00 0x04 0x40 0x01 [sensor
number] [discrete data 1] [discrete data 2]
• Where [discrete data 2] is offset 0 to 7 and [discrete data
1] is offset 8 to 14
• End sensor test
• 0x20 0x2e 0x00 0xcc 0x5e 0x2b 0x00 0x04 0x40 0x02

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Auto Re-arm Threshold Sensor: 44h

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Auto Re-arm Threshold Sensor:
Threshold

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Auto Re-arm Threshold Sensor
Example (1/5)

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Auto Re-arm Threshold Sensor
Example (2/5)
UNC : B0h, UC : E0h, Hysteresis: 0x05

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Auto Re-arm Threshold Sensor
Example (3/5)
UNC : B0h, UC : E0h, Hysteresis: 0x05

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Auto Re-arm Threshold Sensor
Example (4/5)
UNC : B0h, UC : E0h

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Auto Re-arm Threshold Sensor
Example (5/5)
UNC : B0h, UC : E0h

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Re-arm Sensor Events(1/2)

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Re-arm Sensor Events(2/2)
• Byte 3,4: re-arm assertion event
• Byte 5,6: re-arm deassertion event
• The Get Sensor Event Status commands may
be considered as returning the state of
internal flags.

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Manual Re-arm Discrete Sensor: B0h

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#B0h Chassis_Intrus: Type 05h

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Sensor Type Codes

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Manual Re-arm Discrete Sensor(1/6)

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Manual Re-arm Discrete Sensor(2/6)

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Manual Re-arm Discrete Sensor(3/6)
0x03 = LSB 1100 0000 MSB

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Manual Re-arm Discrete Sensor(4/6)
0x01 = LSB 1000 0000 MSB

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Manual Re-arm Discrete Sensor(5/6)
0x0C = LSB 0011 0000 MSB

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Manual Re-arm Discrete Sensor(6/6)

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The End
•Thanks!

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Appendix (1/3) – Get Sensor Reading
Factors

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Appendix (2/3)

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Appendix (3/3)

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Get Sensor Event Status (1/5)

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Get Sensor Event Status (2/5)

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Get Sensor Event Status (3/5)

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Get Sensor Event Status (4/5)

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Get Sensor Event Status (5/5)