Series DHC Digihelic® Differential Pressure Controller
[34.93]
53/64
HIGH
[42.34]
®
Specications - Installation and Operating Instructions
Bulletin P-DHC
[20.96]
1-3/8
The Series DHC Digihelic® Differential Pressure Controller is a 3-in-1 instrument
possessing a digital display gage, control relay switches, and a transmitter with both
current and voltage outputs. Combining these 3 features allows the reduction of
several instruments with one product, saving inventory, installation time, and cost.
The Series DHC Digihelic
pressure, velocity, and volumetric ow applications reading in several commonly
used engineering units with optional unidirectional or bidirectional ranges. These
units achieve a 1.5% or better accuracy on extremely low ranges, and 0.5% accuracy
for ranges at or above 1 in w.c. Calibration can be performed in the eld, making
maintaining its accuracy more manageble. Additionally, the Series DHC Digihelic
differential pressure controller includes 2 SPDT control relays with adjustable
deadbands. Programming the unit is simple using the built-in menu. With scalable
4-20 mA, selectable voltage process outputs, and selectable Modbus
communication, this controller can easily t into your application.
INSTALLATION
Select a clean, dry location that is free from shock and vibration where temperature
limits will not be exceeded. Distance from the transmitter to the receiver is limited
only by total loop resistance. See WIRING section. The tubing feeding pressure to
the instrument can be practically any length required, but longer lengths will slightly
increase response time.
All standard models are calibrated for use in a vertical mounting position. The DHC
will perform properly when mounted at any angle but should be zeroed before use.
Pressure Connections
For installation convenience, there are two sets of 1/8˝ female NPT pressure ports;
one set is located on the back of the unit and the other is located on the side. Be sure
to seal the unused ports with the included pipe plugs (accessory A-330).
• Positive Pressure: Connect tubing to the HIGH PRESSURE port (indicated with a
“+” sign) and vent the LOW PRESSURE port (indicated with a “-” sign) to
atmosphere.
• Negative (Vacuum) Pressure: Connect tubing to the LOW PRESSURE port
(indicated with a “-” sign) and vent the HIGH PRESSURE port (indicated with a
“+” sign) to atmosphere. When operating this device in a dusty environment, install
an optional A-331 lter vent plug into the vented port to keep interior clean.
• Differential Pressure: Connect tubing from the higher source to the HIGH
PRESSURE port (indicated with a “+” sign) and from the lower source to the LOW
PRESSURE port (indicated with a “-” sign).
®
differential pressure controller is the ideal instrument for
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1 [25.40]
1/2 [12.70]
®
or BACnet
PRESSURE
PORT
1 [25.40]
1/8 FEMALE NPT LOW
PRESSURE CONNECTION
3x Ø3/16 [4.77] HOLES EQUALLY
SPACED ON A 4-1/8 [104.78] B.C.
SURFACE MOUNTING
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Polycarbonate.
Accuracy: ±0.5% FSO for all ranges, except 0.5 in w.c. @ ±1% FSO, and ranges at
or below ±0.25 in w.c. @ ±1.5% FSO.
Stability: < ±1% / year FSO.
Pressure Limits: Ranges > 1 in w.c.: 6 psi max operation, 6 psi burst; Ranges ≤ 1
in w.c.: 3.6 psi max operation, 6 psi burst.
®
Temperature Limits: -4 to 158°F (-20 to 70°C).
Thermal Effects: .02% FS / °F (.036% FS / °C).
Power Requirements: 12-28 VDC or 12-28 VAC 50 to 400 Hz.
Power Consumption: 3 VA max.
Output Signal: 4-20 mA (4-wire); 0-10 V, 0-5 V, 1-5 V, and 2-10 V (4-wire).
Communication: BACnet MS/TP or Modbus
Supported Baud Rate: 9600, 19200, 38400, 57600, 76800, 115200.
Device Load: 1/8 unit load.
Zero and Span Adjustments: Accessible via menus.
Response Time: 400 ms (damping set to 0).
Display: Backlit LCD display, LED setpoint indicators.
Electrical Connections: 15 pin male high density D-sub connection. 18˝ (46 cm)
cable with 15 conductors included.
Process Connections: 1/8˝ female NPT ports on side and back.
Enclosure Rating: NEMA 4X (IP66).
Mounting Orientation: Not position sensitive.
Size: 5˝ OD (127 mm) x 1.9˝ (48 mm) deep.
Weight: 8.8 oz (250 g).
The DHC may be either panel (ush) mounted or surface mounted.
Panel Mounting Including -SS Bezel:
1. Cut a 4-9/16˝ (116 mm) diameter hole in the panel.
2. Insert gage and secure in place with provided screws and mounting lugs as
shown in Figure 1.
Surface Mounting
1. Use the drill template (Figure 4 on the next page) on the front of the desired
mounting surface. Provide three 3/16˝ diameter holes in panel on a 4-1/8˝
diameter bolt circle. Cut the opening for the terminal block as shown in Figures 2
and 4.
2. If the rear pressure connections are to be used, also provide 1/2˝ diameter holes
as shown in Figures 2 and 4.
3. Insert 6-32 machine screws from rear of mounting surface, threading them into
The DHC uses a standard 15 pin male high density D-Sub connector available from
most electronic distributors. A pre-wired 18˝ cable is included with each unit. See
below table for cable color wiring information.
15 Pin Connector
Function
12-28 VAC/VDC Power
12-28 VAC/VDC Power
4-20 mA Output Signal
0-10 V Output Signal
External Input Signal
Signal Common
Relay #1 N/O
Relay #1 Common
Relay #1 N/C
Relay #2 N/O
Relay #2 Common
Relay #2 N/C
RS-485 B(+)
RS-485 A(-)
RS-485 Common
NOTICE
CAUTION
TerminalCable Color
1
6
11
7
8
2
12
13
14
15
10
5
4
3
9
Brown
Yellow
Red
Light Purple
Light Green
Black
Violet
Grey
White
Dark Blue
Dark Green
Orange
Tan
Pink
Light Blue
The input power polarity is unimportant.
Wire in accordance with an equivalent national standard or code.
Use copper conductors rated for 60°C. All terminals are rated
CLASS 2.
ISOLATION Zones: Each zone has 500 VAC isolation from all other zones.
Zone Inputs/Outputs
1
Power (1,6)
2
Current (2,11); Voltage (7); External Input (8)
3
Relay 1 (12,13,14)
4
Relay 2 (5,10,15)
5
RS-485 (3,4,9)
4-20 mA Transmitter – Check the specications for the device receiving this signal for
input resistance. Typical 250 to 600 Ω, 600 Ω maximum.
OPERATION
KEY FUNCTIONS
Keys
Function
SP/ALAllows access
Home Position
Main Menu
Function
Sub Menu
Function
Edit Setting
Function
Edit Value
Function
to the Set Point
and Alarm
menus
MENUAllows access
to the menus
UP
Sequences
ARROW
DOWN
Sequences
ARROW
ENTERDisplay full-
scale range of
unit
Return
to home
position
through
menus
through
menus
Enter into
sub menu
Return to
previous
menu
Sequences
through sub
menus
Sequences
through sub
menus
Enter edit
function for
setting
Cancel edit,
return to sub
Menu
Previous
option
Cancel edit,
return to sub
Menu
Increment
the value
Next option Decrement
the value
Accept the
current
option
Short press:
Move caron
to next digit.
Long Press:
Accept the
current value
RESETClear or reset
an Alarm (alarm
set for manual
reset)
Peak/Valley
sub menu
resets display
to present
value
ALARM DESCRIPTOR
SP1 DESCRIPTOR
MULTIPLIER
DESCRIPTOR
VISABLE WITH
SOME VELOCITY
ND FLOW RANGES
EXTERNAL INPUT
UNITS
INPUT VALU
Setting Set Points and Alarms
hot key provides direct access to the Set Point and Alarm MENU. The Set
The
Point and Alarm MENUS that are displayed are based upon the Set Point (SP) and
Alarm (AL) SUB MENUs. Reference the “SPAL MENU” diagram under the Menu Structure section for the complete menu structure.
Set Point Adjustment
Adjusting the DHC set points is quick and simple. Instead of setting a set point and
deadband, simply adjust “SP1T” or “SP2T” for the desired trigger point, and then
adjust “SP1R” or “SP2R” for the desired reset point. The associated LED will light up
green when the set point is triggered.
1.0
SP1T
SP1R
0.8
0.6
0.4
0.2
SP2R
SP2T
0
Figure 5: Set points
Using Figure 5 as an example, an instrument with a 1 in w.c. range would have the
set point 1 turn on at 0.9 in w.c. and off at 0.85 in w.c. SP1T sets the turn on point and
SP1R sets the turn off point. This represents a typical rising pressure set point. The
second portion shows set point 2 turn on at 0.1 in w.c. and off at 0.15 in w.c. SP2T
sets the turn on point, and SP2R sets the turn off point. This represents a typical falling
pressure set point. Either set point can trigger a relay if selected in the rLy1 or rLy2
menus.
Main Menu Selections (Upper Right Display Reads MENU)
• Pin - Set a custom pin code to lock out access to all menu settings
• oPEr Operation - Selection of pressure, velocity or ow mode, display units and
output scaling
• SP Set Point - Enable/disable set points
• AL Alarm - Enable/disable alarm limits, other alarm settings
• rLy Relay - Congure relay source and action when active
• inP Input - Congure external input
• diS Display - Monitor and adjust display related settings: Peak, valley, % output
and dampening
• Conn Connection - Congure RS-485 serial parameters and protocol
• CAL Calibration - Perform user zero and span, restore factory default settings, view
device serial number
Pin - SUB MENU
In order to prevent unauthorized modication of settings, a pin number can be
congured. Pin entry is enabled when the congured pin number is anything other
than 0000.
Unit (Velocity) SUB MENU
For velocity measurement, the following units are available:
• SFPM - Standard feet per minute
• M/S - Meters per second
AVAILABLE VELOCITY RANGES
Input Range in w.c. SCFM Range M/S Range
Air velocity and ow readings are based upon standard dry air
conditions with an ambient temperature of 70°F and a barometric
pressure of 29.92 INHG. Maximum velocity range is obtained with K-Factor set to
maximum value (9.999).
oPEr (Operation) MAIN MENU
The oPEr MENU contains SUB MENUs that select the operating mode, display unit,
and analog output scaling of the instrument.
The SUB MENUS are:
• ≡odE - Mode
• Unit - Display Unit
• POL - Pressure Output Low
• POH - Pressure Output High
• KFAC - Velocity K-Factor
• VOL - Velocity Output Low
• VOH - Velocity Output High
• AREA - Duct Area
• FOL - Flow Output Low
• FOH - Flow Output High
• uoUt - Voltage Output Range
If the instrument mode is set to Pressure, the oPEr MENU will include the POL and
POH SUB MENUs. If the instrument mode is set to Velocity, the oPEr MENU will
include the KFAC, VOL and VOH SUB MENUs. If the instrument mode is set to Flow,
the oPEr MENU will include KFAC, AREA, FOL and FOH SUB MENUs. These menus
will be discussed under their respective sections following the Unit (Velocity) SUB
MENU and Unit (Flow) SUB MENUs sections.
≡odE (Mode) SUB MENU
Set the mode of operation of the instrument.
• PRES - Pressure
• VEL - Velocity
• FLOW - Flow
Unit(Pressure) SUB MENU
For pressure mode, the following units are available:
• INWC - Inches of water column
• FTWC - Feet of water column
• MMWC - Millimeters of water column
• CMWC - Centimeters of water column
• PSI - Pounds per square inch
• INHG - Inches of mercury
• MMHG - Millimeters of mercury
• MBAR - Millibar
• PA - Pascal
• KPA - Kilopascals
• HPA - Hectopascals
• OZIN - Ounce inches
Unit (Flow) SUB MENU
For ow measurements the following units are available:
• SCFM - Standard cubic feet per minute
3
/H - Cubic meters per hour
• M
The Available Flow Ranges table below shows the ow ranges available with the
maximum duct size and K-Factor selected for each input range.
AVAILABLE FLOW RANGES
Input Range in w.c. SCFM Range M
Pressure output low and pressure output high are used to scale the current and voltage
output. Set POL to the desired display reading for 4 mA output. Set POH to the desired
display reading for 20 mA output. POL can be greater than POH. In this situation, the
analog outputs are reverse acting.
KFAC SUB MENU
The K-Factor sub menu becomes accessible if the instrument mode is set to Velocity or
Flow. When the DHC is used with a Pitot tube, the manufacturer may specify a K-Factor.
The adjustment range is 0.001 to 9.999. The factory setting is 1.
VOL and VOH SUB MENUs
Velocity output low and velocity output high are used to scale the current and voltage
output. Set VOL to the desired display reading for 4 mA output. Set VOH to the desired
display reading for 20 mA output. VOL can be greater than VOH. In this situation, the
analog outputs are reverse acting.
AREA SUB MENU
The Area sub menu becomes accessible if the instrument mode is set to Flow. The duct
area is specied in either ft
range is 0.13-25.0 ft
2
or m2 depending on the ow unit selected. The adjustment
2
(0.012-2.323 m2). The factory setting is 1 ft2 (0.093 m2).
FOL and FOH SUB MENUs
Flow output low and ow output high are used to scale the current and voltage output.
Set FOL to the desired display reading for 4 mA output. Set FOH to the desired display
reading for 20 mA output. FOL can be greater than FOH. In this situation, the analog
outputs are reverse acting.
PRESSURE RANGE VS. AVAILABLE UNITS
INWC FTWC MMWC CMWC PSIINHG MMHG MBAR PAKPAHPAOZIN
The voltage output range setting allows the voltage output limits to be congured to 1
of 4 common ranges. Available options include: 0-10 V, 0-5 V, 1-5 V, and 2-10 V. The
factory setting is 0-10 V.
SP (Set Point) MAIN MENU
The SP MENU allows the individual set points to be enabled or disabled. The SUB
MENUS are:
• SP1 - Set Point 1 Enable
• SP2 - Set Point 2 Enable
SP1 (Set Point 1 Enable) SUB MENU
Enable/disable set point 1. When enabled (ON), the set point 1 trigger and reset SUB
MENUS will appear in the SPAL menu. The factory setting is ON.
SP2 (Set Point 2 Enable) SUB MENU
Enable/disable set point 2. When enabled (ON), the set point 2 trigger and reset SUB
MENUS will appear in the SPAL menu. The factory setting is ON.
rLy1, rLy2 (Relay 1 Source, Relay 2 Source) SUB MENUS
• OFF - Relay not used
• SP1 - Set Point 1
• SP2 - Set Point 2
• AL - Either Alarm
• ALHI - High Alarm
• ALLO - Low Alarm
• EXT - External Input
The selected source determines when the relay is active. If the source is active, the
relay will be active.
r1At, r2At (Relay 1 Action, Relay 2 Action) SUB MENUS
• DIR - Direct Acting/CLSE - Close on Active
• REV - Reverse Acting/OPEN - Open on Active
The selected action determines what happens when the relay is active. If the selected
source is an alarm, then the options are CLSE and OPEN.
AL (Alarm) MAIN MENU
The AL MENU allows the features of the alarm to be congured. The SUB MENUS are:
• ALHi - Alarm High Limit Enable
• ALLo - Alarm Low Limit Enable
• ALrE - Alarm Reset Type
• ALiH - Alarm Inhibit Enable
• ALDL - Alarm Delay Time
ALHi (Alarm High Limit Enable) SUB MENU
Enable/disable the alarm high limit. When enabled (ON), the alarm high limit (ALHI)
SUB MENU will appear in the SPAL menu. The factory setting is ON.
ALLo (Alarm Low Limit Enable) SUB MENU
Enable/disable the alarm low limit. When enabled (ON), the alarm low limit (ALLO)
SUB MENU will appear in the SPAL menu. The factory setting is ON.
ALrE (Alarm Reset Type) SUB MENU
• AUTO - Automatic reset (factory setting)
• HOLD - Manual reset. An alarm is reset by the RESET key on the front panel.
ALiH (Low Alarm Inhibit) SUB MENU
• ON - Alarm inhibit is on
• OFF - Alarm inhibit is off (factory setting)
If ALiH is selected ON, a low alarm condition is suspended upon power up until the
process value passes through the alarm set point once.
ALDL (Alarm Delay) SUB MENU
Sets the amount of time an alarm condition must be continuously met before the alarm
condition is recognized. The alarm delay is adjustable from 0-3600 seconds. The
factory setting is 0.
rLy (Relay) MAIN MENU
The rLy menu includes options to congure which source will trigger a relay and what
happens when a relay is triggered. The SUB MENUS are:
• rLy1 - Relay 1 Source
• rLy2 - Relay 2 Source
• r1At - Relay 1 Action
• r2At - Relay 2 Action
inP (Input) MAIN MENU
The inP MENU allows the features of the external input to be congured. The SUB
MENUs are:
• inP - External Input Enable
• tyPE - External Input Type
• DLY - External Input Delay
inP (External Input Enable) SUB MENU
• ON - External input enabled (factory setting)
• OFF - External input disabled
tyPE (External Input Type) SUB MENU
• NO - Normally Open (factory setting)
• NC - Normally Closed
DLY (External Input Delay) SUB MENU
Sets the amount of time the external input must be continuously active before it is
considered active. The delay is adjustable from 0-3600. The factory setting is 0.
diS (Display) MAIN MENU
• PEAK - Peak value
• VALY - Valley value
• PdiS - Process display
• DAMP - Damping Time
PEAK (Peak) SUB MENU
The Peak feature stores the highest process reading the instrument has measured
since the last reset or power up. At power up PEAK is reset to the present pressure
reading. To manually reset the PEAK value, press the RESET key while in the PEAK
SUB MENU.
VALY (Valley) SUB MENU
The valley feature stores the lowest process reading the instrument has measured
since the last reset or power up. At power up VALY is reset to the present pressure
reading. To manually reset the VALY value, press the RESET key while in the VALY
SUB MENU.
PdiS (Process Display) SUB MENU
• STD - Display reads pressure, velocity, or ow values
• PCT - Display reads % of full-scale value
When the display is reading percent, PCT is displayed in the upper right of the display.
DAMP (Damping) SUB MENU
The damping time can be adjusted from 0 to 30 seconds.
Damping stabilizes the display and outputs from instabilities due to circumstances
such as vibration and excessive pressure uctuations. Adjust the damping value until
the display reads a stable value for the application.
The Conn menu contains SUB MENUS to congure the RS-485 serial parameters and
selected protocol. The SUB MENUS are:
• Prot - Protocol
• ADDR - Protocol Address
• bAUd - Serial Baud Rate
• PAr - Serial Parity
• StP - Serial Stop Bits
Prot (Protocol) SUB MENU
• MOD - Modbus
• BAC - BACnet Communication
• NONE - Communication disabled
®
Communication (factory setting)
SPAN (Span Calibration) SUB MENU
For an accurate calibration, perform a Zero calibration rst. The pressure to apply
will depend on the selected mode and the POH, VOH or FOH value. Apply a stable
pressure equal to the congured output high value. Press and hold the ENTER button
until the process value is cleared. The display will show a dash in each digit starting
with the left most position. After 4 dashes have been displayed, the process value will
be displayed and the new span will be applied. If the span cannot be applied, a FAiL
message will be displayed. This error could occur if the applied pressure is too low or
too high.
rSt (Reset Factory Defaults) SUB MENU
• NO - Do nothing
• YES - Reset all settings, clear user calibration
ADDR (Protocol Address) SUB MENU
This value sets the RS-485 device address. See the table below for protocol specic
ranges. The factory setting is 127. SUB MENU not available if protocol is NONE.
Protocol Range
®
Modbus
BACnet
bAUd (Serial Baud Rate) SUB MENU
• 96 - 9600 bps
• 192 - 19200 bps
• 384 - 38400 bps
• 576 - 57600 bps
• 768 - 76800 bps
• 1152 - 115200 bps
• AUTO - Auto-baud (factory setting)
If the selected protocol is Modbus
determine the serial parity and serial stopbits. If selected communication protocol is
BACnet, serial parity and serial stop bits are xed to NONE and 1 respectively. SUB
MENU not available if protocol is NONE.
PAr (Serial Parity) SUB MENU
• EVEN - Even Parity (factory setting)
• ODD - Odd Parity
• NONE - No Parity
SUB MENU not available if protocol is NONE or BAC or if serial baud rate is AUTO.
StP (Serial Stop Bits) SUB MENU
• 1 - One stop bit
• 2 - Two stop bits
1-247
0-127
®
communication, the AUTO setting will also
After selecting YES the instrument will reboot itself.
Sn 1, Sn 2 (Serial Number Display) SUB MENUS
The serial number of the instrument can be viewed on the display using these menus.
The rst 4 characters are available with Sn 1 and the second 4 characters are available
with Sn 2.
SPAL (Set Point/Alarm) MENU
The SPAL menu contains the set point trigger and reset value as well as the alarm
limits. This menu is accessible from the home screen with the SPAL button. If both set
points and both alarm limits are disabled, then the SPAL menu will contain no SUB
MENUS and pressing the SPAL button will not do anything. The SUB MENUS are:
• SP1T - Set Point 1 Trigger
• SP1R - Set Point 1 Reset
• SP2T - Set Point 2 Trigger
• SP2R - Set Point 2 Reset
• ALLO - Alarm Low Limit
• ALHI - Alarm High Limit
SP1T, SP2T (Set Point Trigger) SUB MENUS
These SUB MENUS set the trigger value for each set point. When the process value
equals the set point trigger value, the set point is considered active. These SUB
MENUS are only present if their corresponding enable setting is set to ON.
SP1R, SP2R (Set Point Reset) SUB MENUS
These SUB MENUS set the reset value for each set point. When the process value
equals the set point reset value, the set point is considered inactive. These SUB
MENUS are only present if their corresponding enable setting is set to ON.
ALLO (Alarm Low Limit) SUB MENU
This SUB MENU sets the alarm low limit value. If the process value is less than the
alarm low limit value, the low alarm is considered active.
SUB MENU not available if protocol is NONE or BAC or if serial baud rate is AUTO.
CAL (Calibration) Main Menu
The CAL menu contains SUB MENUS to perform eld calibration, reset settings, and
display information. The SUB MENUS are:
• ZERO - Zero Calibration
• SPAN - Span Calibration
• rSt - Reset Factory Defaults
• Sn 1 - Display Serial Number part 1
• Sn 2 - Display Serial Number part 2
ZERO (Zero Calibration) SUB MENU
For accurate calibration, do not apply any pressure when performing this function.
Press and hold the ENTER button unit the process value is cleared. The display will
show a dash in each digit starting with the left most position. After 4 dashes have been
displayed, the process value will be displayed and the new zero will be applied. For
best results, perform the zeroing function in the same orientation you will mount the
DHC.
ALHI (Alarm High Limit) SUB MENU
This SUB MENU sets the alarm high limit value. If the process value is greater than the
alarm high limit value, the high alarm is considered active.
The range of the alarm limits depends on the selected mode. If both low and high
alarm limits are enabled, they cannot be closer than 2% of full-scale to each other. The
dead bands of the alarm limits are xed at 1% of full-scale.
Auto serial conguration enables the device to determine the baud rate, parity and
stop bits directly from the serial trafc. This allows a device to be quickly and easily
deployed after a valid RS-485 MAC address is chosen. Note that the auto conguration
procedure assumes a serial conguration appropriate to the selected protocol as
follows:
SUPPORTED SERIAL CONFIGURATIONS
Protocol
BACnet - MS/TP9600
®
- RTUEven
Modbus
When Modbus
away from the main network, it is necessary to generate trafc in order to congure the
serial communication. Attempting to read input registers is a good method to generate
trafc. Note that while serial conguration is in progress, the device may not respond
to requests. The device may require multiple read requests to complete the serial
conguration process.
The auto serial conguration process will complete once a message addressed to the
device is received and processed successfully. The serial conguration parameters
are then saved to non-volatile storage and loaded by default each time the device
starts. If the serial conguration of the bus changes, a power cycle of the device is
required to restart the auto serial conguration process.
BACnet Communication Protocol Services
Device Communication Control Service (DM-DCC-B)
This device supports the Device Communication Control Service BIBB. The optional
time duration in minutes is also supported. This device is congured with a password
that must be provided to successfully execute this command. The password is
“Dwyer”.
Reinitialize Device Service (DM-RD-B)
This device supports the Reinitialize Device Service BIBB. The supported device
states are COLDSTART and WARMSTART. All other states return error. This device
is congured with a password that must be provided to successfully execute this
command. The password is “Dwyer”.
Supported
Baud RatesData SizeParityStop Bits
19200
38400
57600
78600
115200
®
communications protocol is selected, and the device is setup ofine or
8None1
1
Odd
None
None2
BACnet Communication Protocol Objects Overview
The instrument supports the following objects:
SUPPORTED BACNET COMMUNICATION PROTOCOL OBJECTS
Object Type
Device
Analog Input
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Analog Value
Multi-State Value
Multi-State Value
Multi-State Value
Multi-State Value
Multi-State Value
Multi-State Value
Multi-State Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Binary Value
Positive
Integer Value
Positive
Integer Value
Positive
Integer Value
Note: The default object identier is 607xxx, where xxx is replaced by the MS/TP
MAC address set in the ADDR SUB MENU under the Conn MENU. The object
identier value will change as the MS/TP MAC address changes. However, if a
specic object identier is written via BACnet communication protocol, then that
value is stored and changes to the MS/TP MAC address will no longer affect the
object identier. Similarly, the default object name includes 607xxx. The object name
will reect the current object identier. If a specic object name is written via BACnet
communication protocol, then that value is stored and changes to the object identier
will no longer affect the object name.
Dynamically
Creatable
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Dynamically
Deletable
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Valley
Velocity K-Factor
Flow Area
Process Output Low
Process Output High
Set Point 1 Trigger Value
Set Point 1 Reset Value
Set Point 2 Trigger Value
Set Point 2 Reset
Alarm High limit
Alarm Low Limit
Process Mode
Voltage Output Range
Relay 1 Source
Relay 1 Action
Relay 2 Source
Relay 2 Action
External Input Type
Enable Set Point 1
Set Point 1 Status
Enable Set Point 2
Set Point 2 Status
Enable Alarm High Limit
Alarm High Limit Status
Enable Alarm Low Limit
Alarm Low Limit Status
Manual Alarm Reset
Power Up Alarm Inhibit
Enable External Input
External Input Status
Alarm Delay
BACnet Communication Protocol Objects
Device Object
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
System Status
Vendor Name
Vendor Identier
Model Name
Firmware Version
Application Software
Version
Location
Description
Protocol Version
Protocol Revision
Protocol Services
Supported
Protocol Object Types
Supported
Object List
Maximum APDU Length
Accepted
Segmentation Supported
APDU Timeout
Number of APDU Retires
Max Master
Max Info Frames
Device Address Binding
Database Revision
Property List
Serial Number
Analog Input - Pressure
This object represents the current pressure reading in the selected unit of measure.
The pressure unit is set via the units property and is independent of the display unit.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
This object represents the current velocity reading in the selected unit measure. The
velocity unit is set via the units property and is independent of the display unit.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Supported velocity units:
• feet-per-minute(77)
• meters-per-second(74)
Analog Value - Flow
This object represents the current ow reading in the selected unit measure. The ow
unit is set via the units property and is independent of the display unit.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Supported ow units:
• cubic-feet-per-minute(84)
• cubic-meters-per-hour(135)
Analog Value - Peak
This object represents the maximum process value measured since the last power
cycle or reset. The unit of measure matches the selected process value. This value
cannot be reset remotely.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
AV1
“Velocity”
Analog Value
Current Reading
{0,0,0,0}
Normal
No Fault Detected
FALSE
*Model Specic
AV2
“Flow”
Analog Value
Current Reading
{0,0,0,0}
Normal
No Fault Detected
FALSE
Process Value Unit
AV3
“Peak”
Analog Value
Current Reading
{0,0,0,0}
Normal
No Fault Detected
FALSE
Process Value Unit
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
This object represents the minimum process value measured since the last power
cycle or reset. The unit of measure matches the selected process value. This value
cannot be reset remotely.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Analog Value - Velocity K-Factor
This object represents the Velocity K-Factor setting. When the instrument is used with
a Pitot tube, the manufacturer may specify a K-Factor in order to properly convert
differential pressure to velocity.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
Analog Value - Flow Area
This object represents the cross sectional area of the duct where ow is to be
measured. The area is specic in either ft
The adjustment range is 0.13-25.0 ft
2
(0.093 m
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
).
AV4
“Valley”
Analog Value
Current Reading
{0,0,0,0}
Normal
No Fault Detected
FALSE
Process Value Unit
AV5
“Velocity K-Factor”
Analog Value
1.0
{0,0,0,0}
Normal
No Fault Detected
FALSE
no-units
9.999
0.001
AV6
“Flow Area”
Analog Value
1.0 (0.093)
{0,0,0,0}
Normal
No Fault Detected
FALSE
square-feet
(square-meters)
25.0 (2.323)
0.13 (0.093)
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
2
or m2 depending on the ow unit selected.
2
(0.012-2.323 m2). The factory setting is 1 ft2
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
This object represents the process or operating mode of the instrument. This setting
determines which process variable is output on the analog channels and measurement
unit of the peak, valley, set points and alarm limits.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Analog Value - Process Output Low
This object represents the process value at which the analog output channels will be
at their minimum value. The unit of this value matches the unit of the selected process
mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
Analog Value - Process Output High
This object represents the process value at which the analog output channels will be
at their maximum value. The unit of this value matches the unit of the selected process
mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
MSV1
“Process Mode”
Multi-State Value
1
{0,0,0,0}
Normal
No Fault Detected
FALSE
3
“Pressure”, “Velocity”,
“Flow”
AV7
“Process Output Low”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
AV8
“Process Output High”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
This object represents the nominal range of the voltage output channel.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Binary Value - Enable Set Point 1
This object represents the enable state of set point 1. When enabled, the set point 1
trigger and reset values are compared against the current process value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Analog Value - Set Point 1 Trigger Value
This object represents the process value at which set point 1 transitions from inactive
to active. The unit of this value matches the unit of the selected process mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
MSV2
“Voltage Output Range”
Multi-State Value
1
{0,0,0,0}
Normal
No Fault Detected
FALSE
4
{“0-10V”, “0-5V”,
“2-10V”, “1-5”}
BV1
“Enable Set Point 1”
Binary Value
Active
{0,0,0,0}
Normal
No Fault Detected
FALSE
AV9
“Set Point 1 Trigger Value”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering
Units
Real
Real
This object represents the process value at which set point 1 transitions from active to
inactive. The unit of this value matches the unit of the selected process mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
Binary Value - Set Point 1 Status
This object represents the current status of set point 1. When active, the SP1 LED on
the instrument face is illuminated.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Binary Value - Enable Set Point 2
This object represents the enable state of set point 2. When enabled, the set point 2
trigger and reset values are compared against the current process value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Analog Value - Set Point 2 Trigger Value
This object represents the process value at which set point 2 transitions from inactive
to active. The unit of this value matches the unit of the selected process mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
AV10
“Set Point 1 Reset Value”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
BV2
“Set Point 1 Status”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
BV3
“Enable Set Point 2”
Binary Value
Active
{0,0,0,0}
Normal
No Fault Detected
FALSE
AV11
“Set Point 2 Trigger
Value”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
This object represents the process value at which set point 2 transitions from active to
inactive. The unit of this value matches the unit of the selected process mode.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
Binary Value - Set Point 2 Status
This object represents the current status of set point 2. When active, the SP2 LED on
the instrument face is illuminated.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Binary Value - Enable Alarm High Limit
This object represents the enable state of the alarm high limit. When enabled, the
alarm high limit value is compared against the current process value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Analog Value - Alarm High Limit
This object represents the process value at which the alarm high status transitions
from inactive to active. The unit of this value matches the unit of the selected process
mode. The alarm high status transitions from active to inactive at 1% full-scale less
than this value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
AV12
“Set Point 2 Reset Value”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Model Specic
BV4
“Set Point 2 Status”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
BV5
“Enable Alarm High Limit”
Binary Value
Active
{0,0,0,0}
Normal
No Fault Detected
FALSE
AV13
“Alarm High Limit”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Model Specic
Alarm Low Limit
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
This object represents the current status of the alarm high limit. When active, the ALHI
LED on the instrument face is illuminated.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
**The high alarm status can be reset to inactive by writing inactive to the present
value property. This is allowed only if the Manual Alarm Reset is Active and the
process value no longer satises the alarm high condition. In all other cases a
BACnet communication protocol error is returned.
Binary Value - Enable Alarm Low Limit
This object represents the enable state of the alarm low limit. When enabled, the alarm
low limit value is compared against the current process value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Analog Value - Alarm Low Limit
This object represents the process value at which the alarm low status transitions
from inactive to active. The unit of this value matches the unit of the selected process
mode. The alarm low status transitions from active to inactive at 1% full-scale greater
than this value.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
BV6
“Alarm High Limit Status”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
BV7
“Enable Alarm Low Limit”
Binary Value
Active
{0,0,0,0}
Normal
No Fault Detected
FALSE
AV14
“Alarm Low Limit”
Analog Value
Model Specic
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
Alarm High Limit
Model Specic
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Real
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
This object represents the current status of the alarm low limit. When active, the ALLO
LED on the instrument face is illuminated.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
**The low alarm status can be reset to inactive by writing inactive to the present
value property. This is allowed only if the Manual Alarm Reset is Active and the
process value no longer satises the alarm low condition. In all other cases a BACnet
communication protocol error is returned.
Binary Value - Manual Alarm Reset
This object represents the alarm type setting (ALrE in the menu). When active, the
alarm status will remain active after the alarm condition has passed.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Binary Value - Power Up Alarm Inhibit
This object represents the Low Alarm Inhibit (ALiH) SUB MENU. When enabled, the
process value must be greater than the alarm low limit before an alarm low condition
is considered active.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Positive Integer Value - Alarm Delay
This object represents the amount of time an alarm condition must be continuously
met before the alarm status becomes active.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
BV8
“Alarm Low Limit Status”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
BV9
“Manual Alarm Reset”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
BV10
“Power Up Alarm Inhibit”
Binary Value
Inactive
{0,0,0,0}
Normal
No Fault Detected
FALSE
PIV1
“Alarm Delay”
Positive Integer Value
0
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
3600
0
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering Units
Real
Real
This object represents the relay 1 source setting. The selected source determines
when the relay is active. If the source is active, the relay will be active.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Multi-State Value - Relay 1 Action
This object represents the relay 1 action setting. The selected action determines what
happens when the relay is active. If the selected source is an alarm, then the state text
values are “Close” and “Open”.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Multi-State Value - Relay 2 Source
This object represents the relay 2 source setting. The selected source determines
when the relay is active. If the source is active, the relay will be active.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
MSV3
“Relay 1 Source”
Multi-State Value
2
{0,0,0,0}
Normal
No Fault Detected
FALSE
7
{“Off”, “Set Point 1”, “Set
Point 2”, “Any Alarm”,
”Alarm High LImit”,
“Alarm Low Limit”,
“External Input”}
MSV4
“Relay 1 Action”
Multi-State Value
1
{0,0,0,0}
Normal
No Fault Detected
FALSE
2
{“Direct”, “Reverse”}
MSV5
“Relay 2 Source”
Multi-State Value
3
{0,0,0,0}
Normal
No Fault Detected
FALSE
7
{“Off”, “Set Point 1”, “Set
Point 2”, “Any Alarm”,
”Alarm High LImit”,
“Alarm Low Limit”,
“External Input”}
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of Character
String
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
This object represents the relay 2 action setting. The selected action determines what
happens when the relay is active. If the selected source is an alarm, then the state text
values are “Close” and “Open”.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Binary Value - Enable External Input
This object represents the enable state of the external input. When enabled, the
external input is monitored and can be used to active a relay.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Multi-State Value - External Input Type
This object represents the type of contact/switch connected to the external input.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Number of States
State Text
Positive Integer Value - External Input Activation Delay
This object represents the amount of time the external input must be continuously
active before it is considered active.
PropertyDefault ValueProperty Data TypeAccess
Object Identier
Object Name
Object Type
Preset Value
Status Flags
Event State
Reliability
Out Of Service
Units
Max Pres Value
Min Pres Value
MSV6
“Relay 2 Action”
Multi-State Value
1
{0,0,0,0}
Normal
No Fault Detected
FALSE
2
{“Direct”, “Reverse”}
BV11
“Enable External Input”
Binary Value
Active
{0,0,0,0}
Normal
No Fault Detected
FALSE
MSV7
“External Input Type”
Multi-State Value
1
{0,0,0,0}
Normal
No Fault Detected
FALSE
2
{“Normally Open”,
“Normally Closed”}
PIV2
“External Input
Activation Delay”
Positive Integer Value
0
{0,0,0,0}
Normal
No Fault Detected
FALSE
Mode Specic
3600
0
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
BACnet Object Identier
Character String
BACnet Object Type
BACnet Binary PV
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
Unsigned
BACnet Array[N] of
Character String
BACnet Object Identier
Character String
BACnet Object Type
Unsigned
BACnet Status Flags
BACnet Event State
BACnet Reliability
Boolean
BACnet Engineering
Units
Real
Real
communications protocol installations should comply with
NOTICE
and Implementation Guide V1.02, Modbus
NOTICE
Modbus
®
Communication Protocol over Serial Line Specication
Modbus
®
Organization, Inc., 2006
Communications wiring must be in a daisy-chain fashion. Star
connections and T connections are not permitted
®
Modbus
Communications Protocol Functions
The DHC supports the following functions.
®
Modbus
Communications Protocol Registers
Input Registers
The String data type is read as a stream of ASCII characters with the rst character
sent in the MSB of the rst register and the second character sent in the LSB of the
rst register and so on. If the string is shorter than the allotted size, the remaining bytes
Invalid Address
Over Range
Under Range
Sensor Range Exceeded
Sensor Error
No Sensor
User Settings Invalid
Factory Settings Invalid
External Memory Failure
Internal Memory Failure
Set Point 1 Enable
Set Point 1 Trigger Value
Set Point 1 Reset Value
Set Point 2 Enable
Set Point 2 Trigger Value
Set Point 2 Reset Value
Enable Alarm High Limit
High Alarm Limit
Enable Alarm Low Limit
Low Alarm Limit
Manual Alarm Reset
Power Up Alarm Inhibit
Alarm Delay
Alarm High Limit Status
Alarm Low Limit Status
Relay 1 Source
Multi-address support allows a register to be read or written to using different byte
orientations specied by the address range. For example, input register 0001 can also
be read at 2001, 4001 and 6001 with different byte orientations as listed in the table
below. Registers that do not have multi-address support are only available in BigEndian byte orientation (Modbus
Byte OrderAddress Range
Big-Endian
Byte Swap
Word Swap
Little-Endian
0001-2000
2001-4000
4001-6000
6001-8000
®
communications protocol standard).
32bit Values16bit Values
Register 1Register 1Register 1
MSBLSBMSB LSB
A
B
C
D
B
C
D
A
D
D
A
C
B
A
C
B
B
A
A
B
B
A
B
A
MAINTENANCE
Upon nal installation of the Series DHC, no routine maintenance is required. The
Series DHC is not eld serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
This symbol indicates waste electrical products should not be disposed
of with household waste. Please recycle where facilities exist. Check with
your Local Authority or retailer for recycling advice.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact
customer service to receive a Return Materials Authorization (RMA) number before
shipping the product back for repair. Be sure to include a brief description of the