User Guide • SC4-CONCERTO • CompactPCI
®
Serial CPU Board
HD (Hard Disk Activity) LED
The SC4-CONCERTO offers a bicoloured LED marked as HD placed within the front panel. This LED,
when blinking green, signals activity on any device attached to the SATA ports of the CM238.
The yellow part of the HD LED shows activity on any of the 88SE9230 SATA ports.
As previously described, the green part of this LED may change its function dependent on the state of
the LED PG.
OT (Processor Hot) LED
The thermal status of the processor can be monitored exactly by several utilities that are available in
the market (e.g. “Speedfan” for Windows
®
or “lmsensors” for Linux). The LED “OT” (over-
temperature) can be assumed as a summery of that. It shows when the processor impends to get too
hot, resulting in reducing its performance by Intel
®
Speed Step
®
or similar.
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