Emerson Fisher FIELDVUE DVC5000 Configuration guide

www.Fisher.com
HARTrField Device Specification
Fisher™FIELDVUE™DVC5000 Digital Valve
Controllers
HART Revision Device Type Device Revision Firmware Revision
HART 5 02 23, 4
35, 6
Introduction 2.................................
Product Overview 2............................
Purpose of this document 2.....................
Abbreviations and definitions 2..................
Reference Documentation 3....................
Device Identification 3..........................
Product Interfaces 4............................
Control Valve Interface 4.......................
Host interface 4...............................
Internal Jumpers And Switches 5.................
Write Protection 5.............................
Firmware Upgrade 5...........................
Dynamic Variables 6............................
Device Variables 6..............................
Status Information 7............................
Device Status 7...............................
Universal Commands 8..........................
CommonPractice Commands 13.................
Supported Commands 13......................
Device-Specific Commands 21....................
Burst Mode 21................................
Catch Device Variable 21.......................
Performance 21................................
Annex A Compatibility Checklist 22................
Annex B DVC5000 Parameters as part
of a Rosemountr1410/1420 WirelessHARTr
Gateway 23...............................
Instruction Manual Supplement
D103266X012
DVC5000 Digital Valve Controller
May 2018
Product removed from sale October 2003

Instruction Manual Supplement
D103266X012
DVC5000 Digital Valve Controller
May 2018
2
Introduction
Product Overview
The FIELDVUE DVC5000 digital valve controller is designed to control the pneumatic actuator of a process control
valve. It receives a current signal from a host and uses instrument air supply to create a metered pressure output signal
to the pneumatic actuator. Movement of the actuator as it positions the process control valve is measured by the
DVC5000 travel sensor as its primary feedback. The name plate is located on the side of the DVC5000 master module
assembly and indicates the model name, individual product serial number, and any applicable third party approvals.
Purpose of this document
This specification is designed to be a technical reference for HART capable host application developers, system
integrators and knowledgeable end-users. It also provides functional specifications (e.g., commands, enumerations
and performance requirements) used during field device development, maintenance and testing. This document
assumes the reader is familiar with HART Protocol requirements and terminology. Additional product information is
available in the DVC5000 product literature, available from your Emerson sales office or Local Business Partner.
Abbreviations and definitions
AR Alert Record
Configuration
Variables
Variables which represent nonvolatile values of manufacturinginitialized data or userspecified
configuration information. These variables cannot be enumerated via Command 54 and as such
stand on their own with no associated units or range information.
Device Variable
Measured variables that are exposed to HART and can be enumerated using Command 54.
Generally there are variables whose ID is in the range of 0 to 10 and are associated with units
codes, status, and range values.
Enumeration A pre-defined set of values or text.
MV Measured Variable, a physical input to the instrument.
NV Named Variable – a logical point inside the device, hardmapped to a given MV as the source of
NV data.
Point A term that applies to diagnostic data packets. It is defined as a collection of periodically sampled
variables captured at a single instant in time. It does not include the “Monitor” point.
Byte An 8bit unsigned integer.
Word A 16bit unsigned integer.
Float Refers to the IEEE 754 floating point format.
Packed ASCII A special form of characters defined by HART in which 6bit ASCII characters are packed into byte
data.
Standard Span
Format
A proprietary 16bit integer format for numerical values used by some of this device’s Device
Specific commands.

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Reference Documentation
HART Smart Communications Protocol Specification Revision 5; a group of documents specifying the HART
Communication Protocol, physical layers, and Data Link Layers as defined by the HART Communications Foundation.
The DVC5000 is not an Active product. Contact your Emerson sales office or Local Business Partner if a copy of the
instruction manual is required.
Device Identification
Manufacturer Name Fisher Controls Model Name(s) DVC5000
Manufacture ID Code 19 (13 Hex) Device Type Code 02 (02 Hex)
HART Protocol Revision 5Device Revision 2 or 3
User Selectable HART Revision
between HART 5 and HART 7 No
Number of Device Variables 9
Physical Layers Supported FSK
Physical Device Category Valve Positioner

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Product Interfaces
Control Valve Interface
The DVC5000 digital valve controller is mechanically attached to the valve’s actuator by means of a mounting bracket.
The control valve's position is conveyed to the travel sensor of the DVC5000 digital valve controller by means of the
feedback bracket attached to the actuator’s stem and the rotating travel sensor.
MOUNTING
BRACKET
Pneumatic tubing connected to the DVC5000 brings instrument supply air to the DVC5000 and takes controlled
output air from the DVC5000 to the actuator. The pressure sensor in the DVC5000 measures the output pressure and
presents it as a device variable.
Host interface
The input to the DVC5000 can either be twowire 4to20 mA current loop (in pointtopoint mode) or 24 VDC (in
multidrop mode). This input is connected in the DVC5000’s terminal box on two terminals marked “LOOP +” and
“LOOP ”. Refer to the DVC5000 instruction manual for connection details.

Instruction Manual Supplement
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Internal Jumpers And Switches
The input to the DVC5000 is determined by the PtPt/MultiDrop switch on the printed wiring board.
MULTI‐DROP SWITCH
AUXILIARY
SWITCH
UP
(MULTI‐DROP)
DOWN
(POINT-TO-POINT)
A6191‐1
XX
LOOP-
LOOP+
Refer to the DVC5000 instruction manual for additional details on the settings of the selection switches.
Write Protection
There are two Write Protection states for the DVC5000: Not Protected or Protected. Protected prevents configuration
and calibration changes to the instrument. The default setting is Not Protected. Protection is controlled under
software control. Write Protection can be enabled remotely. However, to disable Write Protection to Not Protected,
you must have physical access to the instrument. The procedure will require you to short the AUX terminals inside the
terminal box when directed by the software as a security measure.
Firmware Upgrade
The firmware of a DVC5000 printed wiring board assembly cannot be upgraded.

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Dynamic Variables
Four Dynamic Variables are implemented.
COMMAND/RESPONSE MODE BURST MODE
Default Meaning Units Default Meaning Units
PV Analog Input mA, % Valve Travel %
SV Aux Contact Status %Travel Setpoint %
TV Pressure PSI, BAR, KPA Pressure PSI, BAR, KPA
FV Valve Travel %FW5: Aux Status %
FW6: Drive Signal %
Device Variables
These variables represent measurements taken by the device, are read only values, and are all in float format. These
can be read with Commands 33 and 54.
Variable ID Meaning Units
0Analog Input mA, %
1Auxiliary Contact Status (0% = Open, 100% = Shorted) %
2Output Pressure PSI, BAR, KPA
3Valve Travel %
4Drive Signal %
5 Unused
6Travel Setpoint %
7 Unused
8 Unused
9Implied Valve Position (Travel Target) %
10 Valve Travel %
211 Temperature _C, _F
Unit Codes
Variable Units Code Units
0No Units
6Pounds per square inch, psi
7 Bar
12 ($0C) Kilopascals, kPa
32 ($20) Celsius, _C
33 ($21) Fahrenheit, _F
39 ($27) Milliamps, mA
57 ($39) Percent, %

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Status Information
Device Status
The Field Device Status Byte is the only status byte defined in the HART protocol. The order and meaning of each of the
eight bits within the byte are fixed by the protocol. This byte is one of the status bytes included with each HART
response. It is not part of the Command 48 data.
Bit Device Revision Name of Status Bit Meaning
72, 3 Field Device Malfunction
Set / cleared by the firmware based on self test results.
This bit is set if the pressure, position or temperature
sensors provide invalid readings.
62, 3 Configuration Changed
Two such bits exist internally, one for each HART master.
Both copies are set when any variable, HART message,
tag, descriptor or date are changed from HART. Cleared
by command 38, separately for each master. This bit
survives loss of power.
52, 3 Cold Start
Set by the firmware whenever a RESET sequence is
executed or at initial device power up. Cleared by the
first HART command.
42, 3 More Status Active when any bit in command 48 is active.
3
2Not Used
3Analog Input Fixed
Active if the Instrument Mode of the DVC5000 is in the
“Out Of Service” condition or if the Control Mode of the
DVC5000 is in one of the digital set point modes.
22Analog Input Saturated
Active if the Instrument Mode of the DVC5000 is in the
“Out Of Service” condition or if the Control Mode of the
DVC5000 is in one of the digital set point modes.
3Not Used
12, 3 Internal Sensor Out of Limits
(This bit is named “NonPrimary Variable Out Of Limits”
in the HART documentation for transmitters. It has been
renamed to reflect the fact that these variables are
INTERNAL INPUTS to FIELDVUE products). The firmware
sets this bit when any sensor (pressure, position,
temperature) exceeds its operating limits.
02, 3 Loop Current Out of Range Set when any variable 0 (Analog Input) is saturated.

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Universal Commands
The DVC5000 field device implements all HART Revision 5 Universal Commands.
Command 0: Read Unique Identifier
Command 1: Read Primary Variable
Command 2: Read Loop Current and Percent of Range
Command 3: Read Dynamic Variables and P.V. Current
Command 6: Write Polling Address
Command 11: Read Unique Identifier Associated with Tag
Command 12: Read Message
Command 13: Read Tag, Descriptor, Date
Command 14: Read Primary Variable Transducer Information
Command 15: Read Primary Variable Output Information
Command 16: Read Final Assembly Number
Command 17: Write Message
Command 18: Write Tag, Descriptor, Date
Command 19: Write Final Assembly Number

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Command 0: Read Unique Identifiers
Byte Description Format Value
Request
Data Bytes none
Response
Data Bytes
0Data type expansion code Byte, hex $FE
1Manufacturer identification code Byte, hex $13
2Manufacturer’s Device Type code Byte, hex $02
3Number of preambles Byte, hex $05
4Universal command revision Byte, hex $05
5Device revision Byte, hex See table 1 below
6Software revision Byte, unsigned integer See table 1 below
7Hardware revision Byte, unsigned integer See table 2 below
8Device function flags Not Used $00
9Device Identification number 3 Bytes, hex
Code Description
Command
Specific
Response
Codes
none
Table 1. Device and Software Revision
Device Revision Software Revision Description
$02 $03 Firmware Revision 3
$04 Firmware Revision 4
$03 $05 Firmware Revision 5
$06 Firmware Revision 6
Table 2. Hardware Revision
Hardware Revision Description
($08) Not applicable
($10) Hardware revision 2
($18) Hardware revision 3
($20) Hardware revision 4
($28) Hardware revision 5

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Command 1: Read Primary Variable
This command reads the value of the DVC5000’s measured Valve Travel. The units are “%”.
Byte Format Description
Request
Data Bytes none
Response
Data B
y
tes
0Byte, hex Valve Travel Unit Code, 57(%)
14 Float Valve Travel value
Code Class Description
Command
Specific
Response
Codes
none
Command 2: Read Loop Current and Percent of Range
This command reads the value of the DVC5000’s loop current in implied units of “mA” (regardless of the configured
units setting) and the measured Valve Travel in units of “%”.
Byte Format Description
Request
Data Bytes none
Response
Data B
y
tes
03 Float Loop Current
47 Float Valve Travel
Code Class Description
Command
Specific
Response
Codes
none

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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 default Dynamic Variable assignment and the Variable Units Codes are shown on page 6.
Byte Format Description
Request
Data Bytes none
Response
Data Bytes
03 Float Loop Current (implied units of “mA”)
4Byte, hex Primary Variable (PV) units code
58 Float Primary Variable (PV) value
9Byte, hex Secondary Variable (SV) units code
1013 Float Secondary Variable (SV) value
14 Byte, hex Tertiary Variable (TV) units code
1518 Float Tertiary Variable (TV) value
19 Byte, hex Fourth Variable (FV or QV) units code
2023 Float Fourth Variable (FV or QV) value
Code Class Description
Command
Specific
Response
Codes
8Warning – Value read invalid (one of the variables is out of range)
Command 14: Read Primary Variable Transducer Information
Note
The Transducer Serial Number is not applicable to the DVC5000 and is set to “0”.
Byte Format Description
Returned Value
Device Revision 2 Device Revision 3
Request
Data bytes None
Response
Data
Bytes
02 UINT24 Transducer Serial Number 000000 000000
3 Enum
Transducer Limits and
Minimum Span Units
Code
39 (mA) 250 (Not Used)
47 Float Upper Transducer Limit 41C00000 7FA00000 (Not A Number NAN)
811 Float Lower Transducer Limit 00000000 7FA00000 (Not A Number NAN)
1215 Float Minimum Span 40800000 7FA00000 (Not A Number NAN)
Code Class Description
Response
Codes None

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Command 15: Read Primary Variable Output Information
This command returns the upper/lower range values for the measured Valve Travel.
The range values can be changed via Command 35.
Byte Format Description Returned Value
Request
Data bytes None
Response
Data
Bytes
0 Enum
PV Alarm Selection Code (see Common Table 6, Alarm
Selection Codes). The Alarm Selection Code indicates the
action taken by the device under error conditions. For
Actuators, the action taken by the positioner is indicated.
250 (Not Used)
1 Enum
PV Transfer Function Code (see Common Table 3, Transfer
Function Codes). The Transfer Function Code must return
“0”, Linear, if transfer functions are not supported by the
device.
250 (Not Used)
2 Enum AI Upper and Lower Range Values Units Code 57 (%)
3-6 Float AI Upper Range Value 42C80000
7-10 Float AI Lower Range Value 00000000
1114 Float PV Damping Value 250 (Not Used)
15 Enum Write Protect Code 0 or 1
16 Enum Reserved
Code Class Description
Response
Codes None

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CommonPractice Commands
The DVC5000 field device supports the following common practice commands:
Supported Commands
Command 33: Read Device Variables
Command 35: Write Primary Variable Range Values
Command 38: Reset Configuration Change Flag
Command 42: Master Reset
Command 48: Read Additional Status
Command 50: Read Dynamic Variable Assignments*
Command 54: Read Device Variable Information
Command 108: Write Burst Mode Command Number*
Command 109: Burst Control Mode*
*Command 50, 108, and 109 are supported in Device Revision 3 only
Command 33: Read Device Variables
This command is used to read the value of up to four selected Device Variables.
The Device Variables and the Variable Units Code are listed on page 6.
Note: If any one of the requested variable IDs is invalid, the INVALID_SELECTION error will be returned along with no
data bytes.
Byte Format Description Allowable choices
Request
Data Bytes
0Variable ID Variable assigned to slot #0 See Device Variables on page 6
1Variable ID Variable assigned to slot #1 See Device Variables on page 6
2Variable ID Variable assigned to slot #2 See Device Variables on page 6
3Variable ID Variable assigned to slot #3 See Device Variables on page 6
Response
Data Bytes
0Variable ID Variable assigned to slot #0
1Byte, hex Slot #0 Variable units code
25 Float Slot #0 Variable value
6Variable ID Variable assigned to slot #1
7Byte, hex Slot #1 Variable units code
811 Float Slot #1 Variable value
12 Variable ID Variable assigned to slot #2
13 Byte, hex Slot #2 Variable units code
1417 Float Slot #2 Variable value
18 Variable ID Variable assigned to slot #3
19 Byte, hex Slot #3 Variable units code
2023 Float Slot #3 Variable value
Code Class Description
Command
Specific
Response
Codes
2Invalid selection – Invalid Variable ID (see note above)

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Command 35: Write Primary Variable Range Values
In the DVC5000, the Primary Variable is defined to be the measured Valve Travel.
This command is used to write the ranging values reported in Command 15. It sets the engineering units to be
reported with 0% and 100% of calibrated travel.
This command will only be accepted when the DVC5000’s Instrument Mode is in the “Out of Service” condition and
will be rejected if Write Protection is in effect.
Byte Format Description Allowable choices
Request
Data Bytes
0 UINT8 Upper and Lower Range Values Unit Code 57(%)
1  4 Float Primary Variable Upper Range Value
5  8 Float Primary Variable Lower Range Value
Response
Data Bytes
0 UINT8 Upper and Lower Range Values Unit Code 57(%)
1  4 Float Primary Variable Upper Range Value
5  8 Float Primary Variable Lower Range Value
Code Class Description
Command
Specific
Response
Codes
2Invalid selection  Units code did not match configured units
7In Write Protect Mode
16 Access Restricted  Instrument Mode is not in “Out of Service” condition
32 Busy
Command 38: Reset Configuration Change Flag
Resets the configuration changed flag in the DVC5000.
This command is only accepted from the primary HART Master. Any write to the DVC5000 other than digital setpoint
values and write protect status will cause the configuration change flag to be set.
Byte Format Description
Request
Data Bytes none
Response
Data Bytes none
Code Class Description
Command
Specific
Response
Codes
16 Access Restricted (If command is issued from a Secondary master)

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Command 42: Perform Master Reset
Responds immediately by performing a “warm” reset. This is not equivalent to power up in that restart modes and
default IVP are not adopted and the realtime clock is not reset. All other data is read from nonvolatile memory and put
into effect.
A “soft reset” command will be honored while the DVC5000 Instrument Mode is in the “OutofService” condition.
Byte Format Description
Request
Data
bytes
None
Response
Data
Bytes
None
Code Class Description
Command
specific
Response
Codes
16 Error Access Restricted (instrument mode 0Out of Service
Command 48: Read Additional Status
Byte Format Description
Request
Data
bytes
0 None
Response
Data
Bytes
0 Uint8 Command 48 Response Byte 0
1 Uint8 Command 48 Response Byte 1
2 Uint8 Command 48 Response Byte 2
3 Uint8 Command 48 Response Byte 3
4 Uint8 Command 48 Response Byte 4
5 Uint8 Command 48 Response Byte 5
6 Uint8 Operating Mode
7 Uint8 Reserved

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Additional Device Status— DVC5000 Device Revision 2, Firmware 3, 4
Command 48 returns 5 bytes of data, with the following status information:
Byte Bit Name of Status Bit Meaning
0
7 Reserved
6No Free Time 1,2 Active if the microprocessor detects a fault in the servo execution
period.
5RAM Failure 1,2 Active if there is a failure associated with the RAM memory.
4Program Failure 1,2 Active there is a failure associated with the ROM (program)
memory.
3Critical NVM Failure 1,2 Active if there is a failure of nonvolatile memory used for
configuration data critical for instrument operation.
2Temperature Sensor Failure 1,2 Active when the instrument temperature sensor fails or the sensor
reading is outside of the range of 60° to 100°C (76° to 212°F).
1Pressure Sensor Failure 1,2
Active if any of the 3 pressure sensor readings are outside the range
of 24.0% to 125.0% of the calibrated pressure for more than 60
seconds.
0Travel Sensor Failure 1,2 Active if the sensed travel is outside the range of 25.0% to 125.0%
of calibrated travel.
1
7Auto Cal in Progress Alert 2Active when auto calibration is in progress.
6Dynamic Bypass Enabled Active if Dynamic Bypass is enabled.
5Calibration In Progress Alert 2Active when calibration is in progress.
4Diagnostics in Progress Alert 2Active when a diagnostic test is in progress.
3 Reserved
2Custom Characterization Custom Characterization in Effect active if the user-defined Custom
Characterization is enabled.
1Input Characterization Input Characterization in Effect active if any of the user-defined
Characterizations other than “Linear” is enabled.
0 Reserved
2
7 Reserved
6NonCritical NVM Alert 2Active if there is a failure of nonvolatile memory used for data not
critical for instrument operation.
5Cycle Counter High Alert 2Active if the Cycle Counter exceeds the Cycle Count Alert Point.
4Travel Accumulator High
Alert 2Active if the Travel Accumulator exceeds the Travel Accumulator Alert Point.
3 Reserved
2 Reserved
1Offline / Failed Alert 2Active if a shutdown alert has put the DVC5000 in a failed state.
0Auxiliary Input Alert 2Active when the AUX input is configured as an alarm switch and the
alarm is active
"Reserved" bits are always set to 0.
1. Sets “Field Device Malfunction”.
2. Sets “More Status Available”.
(continued)

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Additional Device Status— DVC5000 Device Revision 2, Firmware 3, 4 (continued)
Byte Bit Name of Status Bit Meaning
3
7 Reserved
6 Reserved
5 Reserved
4 Reserved
3 Reserved
2 Reserved
1 Reserved
0 Reserved
4
7Travel Alert Lo 2Active when the Travel is below the Travel Alert Lo Point.
6Travel Alert Lo Lo 2Active when the Travel is below the Travel Alert Lo Lo Point.
5Travel Alert Hi 2Active when the Travel exceeds the Travel Alert Hi Point.
4Travel Alert Hi Hi 2Active when the Travel exceeds the Travel Alert Hi Hi Point.
3Travel Deviation Alert 2
Active if the difference between the Travel Target and the Travel
exceeds the Travel Deviation Alert Point for more than the Travel
Deviation Time.
2Travel Limit/Cutoff Hi Alert 2Active when the Travel exceeds the Hi Limit/Cutoff Point.
1Travel Limit/Cutoff Lo Alert 2Active when the Travel falls below the Lo Limit/Cutoff Point.
0Drive Signal Alert 2Active when the Drive Signal exceeds target limits (<10% or
>90%) for more than 20 seconds when not in Cutoff condition.
"Reserved" bits are always set to 0.
1. Sets “Field Device Malfunction”.
2. Sets “More Status Available”.

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Additional Device Status - DVC5000 Device Revision 3, Firmware 5, 6
Command 48 returns 7 bytes of data, with the following status information:
Byte Bit Name of Status Bit Meaning
0
7 Reserved
6No Free Time 1,2 Active if the microprocessor detects a fault in the servo execution
period.
5RAM Failure 1,2 Active if there is a failure associated with the internal RAM
memory.
4Drive Current Failure 1,2 Active when the drive current to the I/P converter is not flowing as
expected.
3Critical NVM Failure 1,2 Active if there is a failure of nonvolatile memory used for
configuration data critical for instrument operation.
2Temperature Sensor Failure 1,2 Active when the instrument temperature sensor fails or the sensor
reading is outside of the range of 60° to 100°C (76° to 212°F).
1Pressure Sensor Failure 2
Active if any of the 3 pressure sensor readings are outside the range
of 24.0% to 125.0% of the calibrated pressure for more than 60
seconds.
0Travel Sensor Failure 1,2 Active if the sensed travel is outside the range of 25.0% to 125.0%
of calibrated travel.
1
7Auto Cal in Progress Alert 2Active when auto calibration is in progress.
6Dynamic Bypass Enabled 2Active if Dynamic Bypass is enabled.
5Calibration In Progress Alert 2Active when calibration is in progress.
4Diagnostics in Progress Alert 2Active when a diagnostic test is in progress.
3High Performance in Effect Active when the instrument is using the High Performance Tuning
Parameters.
2Custom Characterization Custom Characterization in Effect active if the user-defined
Custom Characterization is enabled.
1Input Characterization Input Characterization in Effect active if any of the user-defined
Characterizations other than “Linear” is enabled.
0PWB Set to “Multi-Drop” 2Active is PWB switch is set to “Multi”
2
7 Reserved
6NonCritical NVM Alert 2Active if there is a failure of nonvolatile memory used for data not
critical for instrument operation.
5Cycle Counter High Alert 2Active if the Cycle Counter exceeds the Cycle Count Alert Point.
4Travel Accumulator High
Alert 2Active if the Travel Accumulator exceeds the Travel Accumulator Alert Point.
3Instrument Time is Invalid
Alert 2Active if the instrument has been powered down since the last time the instrument clock was set.
2 Reserved
1Offline / Failed Alert 2Active if a shutdown alert has put the DVC5000 in a failed state.
0Auxiliary Input Alert 2Active when the AUX input is configured as an alarm switch and the
alarm is active
"Reserved" bits are always set to 0.
1. Sets “Field Device Malfunction”.
2. Sets “More Status Available”.
(continued)

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Additional Device Status - DVC5000 Device Revision 3, Firmware 5, 6 (continued)
Byte Bit Name of Status Bit Meaning
3
7 Reserved
6 Reserved
5 Reserved
4 Reserved
3 Reserved
2 Reserved
1 Reserved
0 Reserved
4
7Travel Alert Lo 2Active when the Travel is below the Travel Alert Lo Point.
6Travel Alert Lo Lo 2Active when the Travel is below the Travel Alert Lo Lo Point.
5Travel Alert Hi 2Active when the Travel exceeds the Travel Alert Hi Point.
4Travel Alert Hi Hi 2Active when the Travel exceeds the Travel Alert Hi Hi Point.
3Travel Deviation Alert 2
Active if the difference between the Travel Target and the Travel
exceeds the Travel Deviation Alert Point for more than the Travel
Deviation Time.
2Travel Limit/Cutoff Hi Alert 2Active when the Travel exceeds the Hi Limit/Cutoff Point.
1Travel Limit/Cutoff Lo Alert 2Active when the Travel falls below the Lo Limit/Cutoff Point.
0Drive Signal Alert 2Active when the Drive Signal exceeds target limits (<10% or
>90%) for more than 20 seconds when not in Cutoff condition.
5
7 Reserved
6 Reserved
5 Reserved
4 Reserved
3 Reserved
2 Reserved
1 Reserved
0 Reserved
Byte Left Digit Name of Status Bit
6
“0” Out of Service
“1” In Service
Right Digit Name of Status Bit
“3” “Analog (RSP)” Control
Mode
“2” “Digital” Control Mode
“1” Not used
“0” “Test” Control Mode
"Reserved" bits are always set to 0.
1. Sets “Field Device Malfunction”.
2. Sets “More Status Available”.

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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.
Byte Format Description
Request
Data Bytes None
Response
Data Bytes
0 UINT8 ID of variable returned as the first variable (PV) in Command #3
1 UINT8 ID of variable returned as the second variable (SV) in Command #3
2 UINT8 ID of variable returned as the third variable (TV) in Command #3
3 UINT8 ID of variable returned as the fourth variable (FV) in Command #3
Code Class Description
Command
Specific
Response
Codes
None
Command 54: Read Device Variable Information
Used to identify each of the Device Variables in the range of IDs 0, 1, 2, 3, 4, 6, 9, 10, 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 Format Description
Request Data
Bytes 0 Enum Device Variable ID, this command is applicable to variables 0, 1, 2, 3, 4, 6, 9, 10, and 211. All others will return invalid selection
Response
Data Bytes
0 UINT8 Device Variable ID (see “Device Variables” table page 6)
13 Device Variable Sensor Serial Number, 24bit number
(NOT USED  always zero)
4 UINT8 Device variable units code (see “Units Codes” table on page 6.)
58 Float Device Variable Upper Range
912 Float Device Variable Lower Range
1316 Float Device Variable Damping Value,
(NOT USED  always zero)
1720 Float Device Variable Minimum Span (NOT USED  always zero)
Code Class Description
Command
Specific
Response
Codes
2Invalid Selection