Fisher FIELDVUE DVC2000 Instruction Manual Supplement page 19

Instruction Manual Supplement
D103783X012
Command 50: Read Dynamic Variable Assignments
This command returns a list of four device variable codes taken from table DVC Device Variables which are returned in
Command 3. These Dynamic Variables are fixed and control the Command 3 response, whether burst or by request.
Byte
Request
None
Data Bytes
0
1
Response
2
Data Bytes
3
Code
Command­
Specific
None
Response
Codes
Command 54: Read Device Variable Information
Used to identify each of the Device Variables in the range of IDs 0...10 inclusive and 211. Responds with the Sensor
Serial Number, Sensor range Units, Sensor ranges, Damping Value, and Minimum Span of the selected Variable. The
Variable range values will be in the same units as the Variable Units.
Byte
Request Data
0
Bytes
0
1­3
4
Response
5­8
Data Bytes
9­12
13­16
17­20
Code
Command­
Specific
2
Response
Codes
Format Description
UINT8 ID of variable returned as the first variable (PV) in Command #3
UINT8 ID of variable returned as the second variable (SV) in Command #3
UINT8 ID of variable returned as the third variable (TV) in Command #3
UINT8 ID of variable returned as the fourth variable (FV) in Command #3
Class Description
Format Description
Device Variable ID, this command is applicable to variables 0­10 or 211.
Enum
All others will return invalid selection
UINT8 Device Variable ID
Device Variable Sensor Serial Number, 24­bit number
(NOT USED ­ always zero)
UINT8 Device variable units code
Float Device Variable Upper Range
Float Device Variable Lower Range
Device Variable Damping Value,
Float
(NOT USED ­ always zero)
Float Device Variable Minimum Span (NOT USED ­ always zero)
Class Description
Invalid Selection
DVC2000 Digital Valve Controller
September 2017
19