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16 Intel
®
NetStructure™ MPCHC5525 System Master Processor Board IPMI Reference Driver User’s Guide
IBMU Functionality
2.2.1.3 On-Board Temperature Sensor
To read out the actual temperature value from the on-board sensor, the procedure is as follows:
1. The system management software sends the IPMI command “Get Sensor Reading” to the
BMC, the BMC reads the value from the on-board sensor and sends it to the system
management software.
2. The system management software compares the read value with a threshold value.
3. If the temperature is too high, the system management software can, for example, initiate a
switch board or an alarm module to switch off the board by deactivating the BD_SEL# signal.
2.2.2 Communication between Chassis
Communication between several chassis is possible with the ICMB, which is an RS-485-based bus.
It connects the BMCs of two or more chassis. You can connect up to 42 chassis, according to the
ICMB Specification v1.0 Rev. 1.2. Refer to this specification for information on maximum cable
length.
The chassis are connected via the CPU boards’ RTBs. The ICMB connector is typically located on
the RTB’s front panel. See the Intel
®
NetStructure™ MPRTM4808 Technical Product Specification
for further reference.
Figure 7. Example for Nonintelligent Devices
Figure 8. Example: On-Board Sensor