Flowserve MX HART Field Unit - Manual (Page 57)

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MX/QX HART Field Unit FCD LMENIM2340-00 – 1/14
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Enum
Enum-8
An integer enumeration with each numeric value having a specific meaning. Only values specified in “Appendix
C – Enumeration and Bit Field Tables” are used.
Float
An IEEE 754 single precision floating point number. The exponent is transmitted first followed by the most
significant mantissa byte.
Latin-1 A string using the 8-bit ISO Latin-1 character set. Latin-1 strings are padded out with zeros (0x00).
Packed
A string consisting of 6-bit alpha-numeric characters that are a subset of the ASCII character set. This allows four
characters to be packed into three bytes. Packed ASCII strings are padded out with space (0x20) characters.
Unsigned-nn
An unsigned integer where nn indicates the number of bits in this integer. Multi-byte integers are transmitted
MSB-LSB.
Time
An unsigned 32-bit binary integer with the least significant bit of the time value representing 1/32 of a millisecond
(i.e. 0.03125 milliseconds). When time data types are used to represent time of day they indicate the number of
1/32 of milliseconds since midnight. Time can span in excess of 37 hours. When a longer span is required the
field device should use time in conjunction with a Date.
Appendix C – Enumeration and Bit Field Tables
Extended Field Device Status
Bit Mask Description
0x00 Status OK
0x01
Maintenance Required: This bit is set to indicate that, while the device has not malfunctioned, the Field Device
requires maintenance.
0x02
Device Variable Alert: This bit is set if any Device Variable is in an Alarm or Warning State. The host should
identify the Device Variable(s) causing this to be set using the Device Variable Status Indicators.
0x04 Critical Power Failure: Not Used
0x08 Failure: Not Used
0x10 Out of Specification: Not Used
0x20 Function Check: Not Used
Units Code:
Temperature
Unit Code Description
32 Degrees Celsius
33 Degrees Fahrenheit
39 Milliamperes
Miscellaneous
Unit Code Description
57 Percent
Loop Current Mode
Code Loop Current Mode Description
0 Signaling Disabled (Multi-drop)
1 Signaling Enabled (Point-to- Point)
Variable Classification
Code Device Variable Classification
0 Device Variable Not Classified
64 Temperature
Device Variable Family
Code Device Variable Family