SES Elements
The SCSI Send Diagnostic and Receive Diagnostic Results commands can be addressed to a specific SES element in the enclosure. There are many different element codes defined to cover a wide range of devices. The most common SES elements are power supply, cooling fan, temperature sensor, and UPS. The SCSI command protocols assume that there may be more than one of each device type so they must be each given an 8-bit address.
When an SES controller is interrogated for the status of an SES element, the response includes a 4-bit element status code. The most common element status codes are: 1h=OK, 2h=critical, 3h=warning, 5h=not installed.
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