Motorola 900 series - SCSI Backplane

SCSI Device Expansion Module
4-2
A cooling sensor for the SCSI Device Expansion Module is on the backplane.
The backplane contains the comparator circuitry to determine cooling failure.
Two thresholds are used. The lower temperature threshold sends an open
collector signal back to the host and illuminates the yellow LED on the rear of
the SCSI Device Expansion Module. The higher threshold powers off the SCSI
Device Expansion Module protecting its contents regardless of the action
taken by the host. A voltage sensing circuit sends a signal back to the host
when the DC output of the power supply has dropped out.
Reference Guide
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