Fisher FIELDVUE DVC2000 Instruction Manual Supplement page 11

Instruction Manual Supplement
D103783X012
Command 3: Read Dynamic Variables and Loop Current
This command is used to read the value of Loop Current and the four Dynamic Variables. The four dynamic variables
returned depend upon the variable assignment as defined by Command 51 and read back via Command 50.
The default Dynamic Variable assignment and the Variable Units Codes are shown on page 6.
Byte
Request
none
Data Bytes
0­3
4
5­8
9
Response
10­13
Data Bytes
14
15­18
19
20­23
Code
Command­
Specific
8
Response
Codes
Command 14: Read Primary Variable Transducer Information
The transducer limits reported in this command indicate that these values are set to "Not Used"
Note
The Transducer Serial Number is not applicable to the DVC2000 and is set to "0". The other parameters will be set to "0x7F",
"0xA0", "0x00", or "250" Not Used , when they are not applicable.
Byte
Request
None
Data bytes
0­2
3
Response
Data 4­7
Bytes
8­11
12­15
Code
Response
None
Codes
Format Description
Float Loop Current (implied units of "mA")
Byte, hex Primary Variable (PV) units code
Float Primary Variable (PV) value
Byte, hex Secondary Variable (SV) units code
Float Secondary Variable (SV) value
Byte, hex Tertiary Variable (TV) units code
Float Tertiary Variable (TV) value
Byte, hex Fourth Variable (FV or QV) units code
Float Fourth Variable (FV or QV) value
Class Description
Warning – Value read invalid (one of the variables is out of range)
Format Description
UINT24 Transducer Serial Number
Enum Transducer Limits and Minimum Span Units Code
Float Upper Transducer Limit
Float Lower Transducer Limit
Float Minimum Span
Class Description
DVC2000 Digital Valve Controller
September 2017
Returned Value
000000
250 (Not Used)
7FA00000 (Not A Number NAN)
7FA00000 (Not A Number NAN)
7FA00000 (Not A Number NAN)
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