7BChapter Four: Operation 77BS-Device Supervisor Object
81
Last Calibration Date
Attribute ID # 0x13 reports the date the device was last calibrated by the user. The response is
formatted as a data structure of four bytes used to represent a calendar date, as listed in Table 48.
Table 48: Calibration Date Format
Byte # Description Data Type Range
0-1 Year UINT 1997 to 2100
2 Month USINT 1 to 12
3 Day USINT 1 to 31
Next Calibration Date
Attribute ID # 0x14 identifies the date the device is scheduled for the next calibration. The date is
formatted as a data structure of four bytes used to represent a calendar date, as listed in Table 48.
Calibration Expiration Timer
Attribute ID # 0x15 specifies the tim
e rema
ining until the next recommended calibration. The
acceptable input range is -32767 to +32767 hours. The initial setting is 0. The attribute has a
resolution of 1 hour.
Calibration Expiration Warning Enable
Attribute ID # 0x16 specifies whether or not the Calibration Tim
er (Attribute ID #03 in this
object) will set the “Calibration Recom
mended” warning status bit in the exception status
attribute in the S-Device Supervisor Object (refer to Table 47, page 79), where:
0 =
Disable (initial)
1 =
Enable
Run Hours
Attribute ID # 0x17 reports the number of hours the device has been powered on. The response
has a resolution of 1 hour and a range of 0 to 65535. This value does not reset to zero when the
unit is powered down.
Factory Calibration Date
Attribute ID #64 reports the date the device was last calibrated at the factory
. The response is
form
atted as a data structure of four bytes used to represent a calendar date, as listed in Table 48,
page 81.
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