APG DDL Operating Manual
Large Digital Display
Instruction Manual
®
Large Display
• Large 1.80" Digits
• Dual-Line 6-Digit Display
• Readable from up to 100 Feet (30 Meters) Away
• Superluminous Sunlight Readable Display
• NEMA 4X, IP65 Rated Field Mountable Enclosure
• Operating Temperature Range of -40 to 65°C (-40 to 150°F)
• 0-20 mA, 4-20 mA, 0-5 V, 1-5 V, and ±10 V Inputs
• Input Power Options Include 85-265 VAC or 12-24 VDC
• Isolated 24 VDC Transmitter Power Supply
• Signal Input Conditioning for Flow & Round Horizontal Tanks
• Programmable Display & Function Keys
• Multi-Pump Alternation Control
• 4 Relays + Isolated 4-20 mA Output Option
• Onboard USB & RS-485 Serial Communication
• Modbus® RTU Communication Protocol Standard
• Program the Meter from a PC with onboard USB and MeterView Pro
Automation Products Group
1025 W 1700 N • Logan UT 84321 USA
Tel (435) 753-7300 • Fax (435) 753-7490
www.apgsensors.com
Large Digital Display Instruction Manual
Caution: Read complete
instructions prior to installation and
operation of the meter.
Warning: Risk of electric shock or
personal injury.
Warning!
This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss. Anyone
using this product for such applications does so at their
own risk. Automation Products Group, Inc. shall not be
held liable for damages resulting from such improper
use.
!
Disclaimer
The information contained in this document is subject to change without notice. Automation
Products Group makes no representations or warranties with respect to the contents hereof
and specifically disclaims any implied warranties of merchantability or fitness for a particular
purpose.
Limited Warranty
Automation Products Group, Inc. warrants this product against defects in material or
workmanship for the specified period under “Specifications” from the date of shipment from
the factory. Automation Products Group’s liability under this limited warranty shall not
exceed the purchase value, repair, or replacement of the defective unit.
Registered Trademarks
Modbus® is a Registered Trademark of Schneider Automation Inc. All other trademarks
mentioned in this document are the property of their respective owners.
© 2018 Automation Products Group, Inc. All rights reserved.
www.apgsensors.com
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Large Digital Display Instruction Manual
Table of Contents
Table of Contents ............................................................ 3
Table of Figures .............................................................. 4
Introduction ..................................................................... 4
Ordering Information ....................................................... 4
Specifications .................................................................. 5
General ................................................................................. 5
Process Input ........................................................................ 5
Relays ................................................................................... 6
Isolated 4-20 mA Transmitter Output ..................................... 6
RS485 Serial Communications Terminal ............................... 6
Modbus® RTU Serial Communications .................................. 6
Digital Input & Output Terminal .............................................. 7
Compliance Information .................................................. 7
Safety .................................................................................... 7
Safety Information ........................................................... 8
Installation ....................................................................... 8
Unpacking ............................................................................. 8
Wall Mounting Instructions .................................................... 9
Mounting Dimensions ....................................................... 9
Pipe Mounting Instructions .................................................. 10
Transmitter Supply Voltage Selection (P+, P-) ..................... 11
Connections ........................................................................ 11
Connectors Labeling ....................................................... 12
Power Connections ......................................................... 12
Signal Connections ......................................................... 13
Modbus RTU Serial Communications ............................. 14
Relay Connections .......................................................... 14
Switching Inductive Loads ............................................... 15
RS485 Output Connections ............................................ 16
Digital I/O Connections ................................................... 18
F4 Digital Input Connections ........................................... 18
4-20 mA Output Connections .......................................... 19
Analog Output Transmitter Power Supply ....................... 19
Interlock Relay Feature ................................................... 19
Setup and Programming ............................................... 20
Overview ............................................................................. 20
Programming Buttons and Status LED Indicators ................ 21
MeterView® Pro Software .................................................... 22
MeterView Pro Installation .............................................. 22
Display Functions & Messages ............................................ 23
Main Menu .......................................................................... 25
Setting Numeric Values ....................................................... 25
Setting up the Meter (setup) ............................................... 26
Setting the Input Signal (Input) ...................................... 27
Setting the Input Units or Custom Tags (units) .............. 27
Setting the Decimal Point (dEc pt) ................................. 28
Programming the Meter (prog) ....................................... 29
Setting the Display Parameter & Intensity (dsplay) ........ 32
Setting the Relay Operation (relay).................................... 33
Setting the Relay Action .................................................. 34
Programming Set and Reset Points ................................ 34
Setting Fail-Safe Operation ............................................. 34
Programming Time Delay ............................................... 34
Relay Action for Loss of 4-20 mA Input (Loop Break) ...... 35
Relay and Alarm Operation Diagrams ................................. 35
High Alarm Operation (Set > Reset) ............................... 35
Low Alarm Operation (Set < Reset) ................................ 35
High Alarm with Fail-Safe Operation (Set > Reset) ......... 36
Low Alarm with Fail-Safe Operation (Set < Reset) .......... 36
Pump Alternation Control Operation ............................... 36
Relay Sampling Operation .............................................. 37
Signal Loss or Loop Break Relay Operation ................... 37
Time Delay Operation .................................................... 37
Relay Operation Details ...................................................... 38
Overview ........................................................................ 38
Relays Auto Initialization ................................................ 38
Fail-Safe Operation ........................................................ 38
Front Panel LEDs ........................................................... 38
Latching and Non-Latching Relay Operation .................. 39
Non-Latching Relay (Auto) ............................................. 39
Non-Latching Relay (A-man) ........................................ 39
Latching Relay (LatcH) .................................................. 39
Latching Relay (Lt-Clr) ................................................ 39
Acknowledging Relays ................................................... 40
Pump Alternation Control Applications (Altern) ............. 40
Setting up the Interlock Relay (Force On) Feature .......... 42
Scaling the 4-20 mA Analog Output (Aout) ......................... 43
Reset Menu (reset) ........................................................... 43
Control Menu (Contrl) ....................................................... 43
Setting up the Password (pass) .......................................... 44
Protecting or Locking the Meter ...................................... 44
Making Changes to a Password Protected Meter ........... 45
Disabling Password Protection ....................................... 45
Advanced Features Menu ................................................... 46
Advanced Features Menu & Display Messages .............. 46
Noise Filter (filter) ...................................................... 48
Noise Filter Bypass (bypass) ......................................... 48
Rounding Feature (round) ............................................. 48
Modbus RTU Serial Communications (serial) .............. 48
Select Menu (SElect) .................................................... 49
Signal Input Conditioning (Functn) ................................. 49
Low-Flow Cutoff (CutofF) .............................................. 51
Analog Output Programming (AoutPr) ........................... 51
Programmable Function Keys User Menu (user) ........... 51
Tare (tare) .................................................................... 52
Internal Source Calibration (ICAL) .................................. 53
Meter Operation ............................................................ 54
Button Operation ................................................................ 54
Function Key Operation ...................................................... 54
Digital Input Operation ........................................................ 54
Maximum/Minimum Readings ............................................. 55
Troubleshooting ............................................................. 56
Diagnostics Menu (diag) .................................................... 56
Determining Software Version ........................................ 56
Reset Meter to Factory Defaults ......................................... 56
Factory Defaults & User Settings .................................... 57
Troubleshooting Tips .......................................................... 58
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Large Digital Display Instruction Manual
Model Number
Reorder Number
Power
Options Installed
PD2-6000-6H0-AP
DDL-A00
85-265 VAC
No Options
PD2-6000-6H7-AP
DDL-A14
85-265 VAC
4 relays & 4-20 mA output
PD2-6000-7H0-AP
DDL-D00
12-24 VDC
No Options
PD2-6000-7H7-AP
DDL-D14
12-24 VDC
4 relays & 4-20 mA output
Model Number
Description
PDA6260
Pipe Mounting Kit
PDA7485-I
RS-232 to RS-422/485 isolated converter
PDA7485-N
RS-232 to RS-422/485 non-isolated converter
PDA8485-I
USB to RS-422/485 isolated converter
PDA8485-N
USB to RS-422/485 non-isolated converter
PDAPLUG2
Plastic Conduit Plug
PDX6901
Suppressor (snubber): 0.01 µF/470 , 250 VAC
Table of Figures
Figure 1. Meter Mounting Holes ................................................. 9
Figure 2. Meter Dimensions - Side View .................................... 9
Figure 3. Meter Dimensions – Front View .................................. 9
Figure 4. Vertical Pipe Mount Assembly................................... 10
Figure 5. Horizontal Pipe Mount Assembly .............................. 10
Figure 6. Transmitter Supply Voltage Selection ....................... 11
Figure 7. Connector Labeling for Fully Loaded Meter ............... 12
Figure 8. Power Connections ................................................... 12
Figure 9. Transmitters Powered by Internal Supply .................. 13
Figure 10. Transmitter Powered by Ext. Supply or Self-Powered
................................................................................................ 13
Figure 11. Voltage Input Connections ...................................... 14
Figure 12. Relay Connections .................................................. 14
Figure 13. AC and DC Loads Protection .................................. 15
Figure 14. Low Voltage DC Loads Protection .......................... 15
Figure 15. RS-422 or RS-485 Wiring ....................................... 16
Figure 16. RS-485 Two-Wire Multi-Drop Wiring ....................... 17
Figure 17. Connections for RS485 Connector to Serial Converter
............................................................................................... 17
Figure 18. Three-Wire RS485 Connection ............................... 17
Figure 19. Digital Input and Output Connections ..................... 18
Figure 20. F4 Digital Input Connections .................................. 18
Figure 21. 4-20 mA Output Connections ................................. 19
Figure 22. Interlock Connections ............................................. 19
Figure 23. Acknowledge Relays with Function Key or Digital
Input........................................................................................ 40
Introduction
This analog input meter is a multi-purpose, easy to use, large-display digital process meter ideal for level,
flow rate, temperature, or pressure transmitter applications. It features large 1.8 inch superluminous LED
digits, which can be read in direct sunlight from up to 100 feet (30 meters) away. It is housed in a waterresistant, field-mountable NEMA 4X/IP65 rated enclosure for convenient indoor and outdoor installation.
The meter accepts current and voltage signals (e.g. 4-20 mA, 0-10 V). Three of the programming buttons
can be set for custom operation. The analog input can be scaled to display the process in two different
scales; for example, the main display could indicate level in feet and the second display could indicate the
volume in gallons.
A fully loaded meter comes with four (4) SPDT relays, a 4-20 mA output, two 24 VDC power supplies, five
(5) digital inputs and four (4) digital outputs, and RS485 serial communications.
The two or four relays can be used for alarm indication or process control applications such as pump
alternation control. The 4-20 mA isolated output, Modbus RTU serial communications, and digital I/O
features make this meter an excellent addition to any system.
Ordering Information
Standard Models
Accessories
Manufactured by Precision Digital Corporation, 233 South St, Hopkinton MA 01748 USA
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Large Digital Display Instruction Manual
Specifications
Display
Main display: 1.8" (46 mm) high, red
LEDs
6 digits per line (-99999 to 999999), with
lead zero blanking
Display
Intensity
Eight user selectable intensity levels
Display
Update Rate
5/second (200 ms)
Overrange
Display flashes 999999
Underrange
Display flashes -99999
Display
Assignment
Line 1 and line 2 may be assigned to
PV1, PV2, PCT, d r-u, d gross, d nt-g,
max/min, max & min, set points, units
(line 2 only), or Modbus input.
Programming
Methods
Four programming buttons, digital inputs,
PC and MeterView Pro software, or
Modbus registers.
Noise Filter
Programmable from 2 to 199 (0 will
disable filter)
Filter Bypass
Programmable from 0.1 to 99.9% of
calibrated span
Recalibration
All ranges are calibrated at the factory.
Recalibration is recommended at least
every 12 months.
Max/Min
Display
Max/min readings reached by the
process are stored until reset by the
user or until power to the meter is turned
off.
Password
Three programmable passwords restrict
modification of programmed settings.
Pass 1: Allows use of function keys and
digital inputs
Pass 2: Allows use of function keys,
digital inputs and editing set/reset points
Pass 3: Restricts all programming,
function keys, and digital inputs.
Power Options
85-265 VAC 50/60 Hz, 90-265 VDC, 20
W max or 12-24 VDC 10%, 15 W max
Powered over USB for configuration only.
Isolated
Transmitter
Power Supply
Terminals P+ & P-: 24 VDC 10%. 12-24
VDC powered models selectable for 24, 10,
or 5 VDC supply (internal P+/P- switch).
85-265 VAC models rated @ 200 mA max,
12-24 VDC powered models rated @ 100
mA max, @ 50 mA max for 5 or 10 VDC
supply.
Non-Volatile
Memory
All programmed settings are stored in
non-volatile memory for a minimum of
ten years if power is lost.
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 meters may
share one 5 A fuse
Normal Mode
Rejection
Greater than 60 dB at 50/60 Hz
Isolation
4 kV input/output-to-power line
500 V input-to-output or output-to-P+
supply
Overvoltage
Category
Installation Overvoltage Category II:
Local level with smaller transient
overvoltages than Installation
Overvoltage Category III.
Environmental
Operating temperature range: -40 to
150°F (-40 to 65°C)
Storage temperature range: -40 to 185°F
(-40 to 85°C)
Relative humidity: 0 to 90% noncondensing
Connections
Removable and integrated screw
terminal blocks accept 12 to 22 AWG
wire.
Enclosure
UL Type 4X, IP65 rated. Polycarbonate
& glass blended plastic case, color:
gray. Includes four PG11 through-hole
conduit openings, with two factory
installed PG11, IP68, black nylon
threaded hole plugs with backing nuts.
Mounting
Wall Mounting: Four (4) mounting holes
provided for mounting meter to wall. See
Wall Mounting Instructions on page 9 for
additional details.
Pipe Mounting: Optional pipe mounting
kit (PDA6260) allows for pipe mounting.
Sold separately. See Pipe Mounting
Instructions on page 10 for additional
details.
Tightening
Torque
Removable Screw Terminals: 5 lb-in
(0.56 Nm)
Digital I/O and RS485 Terminals: 2.2
lb-in (0.25 Nm)
Overall
Dimensions
10.63" x 12.59" x 4.77" (270 mm x 319.7
mm x 121.2 mm) (W x H x D)
Weight
6.10 lbs (2.76 kg)
Warranty
Please see https://www.apgsensors.com/
about-us/terms-conditions for full
warranty statement.
Inputs
Field selectable: 0-20, 4-20 mA, 10 V (05, 1-5, 0-10 V), Modbus PV (Slave)
Accuracy
±0.03% of calibrated span ±1 count,
square root & programmable exponent
accuracy
range: 10-100% of calibrated span
Temperature
Drift
0.005% of calibrated span/C max from 0
to 65C ambient,
0.01% of calibrated span/C max from -40
to 0C ambient
Signal Input
Conditioning
Linear, square root, programmable
exponent, or
round horizontal tank volume calculation
Multi-Point
Linearization
2 to 32 points for PV or PV1
2 to 8 points for PV2 (Dual-scale Level
feature)
Except where noted all specifications apply to operation at +25°C.
General
Process Input
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Large Digital Display Instruction Manual
Programmable
Exponent
1.0001 to 2.9999
Round H Tank
Diameter & Length: 999.999 inch or cm
calculates volume in gallons or liters
respectively.
Low-Flow
Cutoff
0-999999 (0 disables cutoff function)
Decimal Point
Up to five decimal places or none:
d.ddddd, d.dddd, d.ddd, d.dd, d.d, or
dddddd
Calibration
Range
Input Range
Minimum Span Input 1 &
Input 2
4-20 mA
0.15 mA
10 V
0.01 V
An error message will appear if the input
1 and input 2 signals are too close
together.
Input
Impedance
Voltage ranges: greater than 500 k
Current ranges: 50 - 100 (depending
on resettable fuse impedance)
Input Overload
Current input protected by resettable
fuse, 30 VDC max.
Fuse resets automatically after fault is
removed.
F4 Digital
Input Contacts
3.3 VDC on contact. Connect normally
open contacts across F4 to COM.
F4 Digital
Input
Logic Levels
Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC
Rating
4 SPDT (Form C) internal rated 3 A @
30 VDC and 125/250 VAC resistive load;
1/14 HP (≈ 50 W) @ 125/250 VAC for
inductive loads
High or Low
Alarm
User may program any alarm for high or
low trip point.
Unused alarm LEDs and relays may be
disabled (turn off).
Relay
Operation
Automatic (non-latching) and/or manual
reset
Latching (requires manual acknowledge)
with/without clear
Pump alternation control (2 to 4 relays)
Sampling (based on time)
Off (disable unused relays and enable
Interlock feature)
Manual on/off control mode
Relay Reset
User selectable via front panel buttons
or digital inputs
1. Automatic reset only (non-latching),
when the input passes the reset
point.
2. Automatic + manual reset at any time
(non-latching)
3. Manual reset only, at any time
(latching)
4. Manual reset only after alarm
condition has cleared (latching)
Note: Front panel button or digital input
may be assigned to acknowledge
relays programmed for manual
reset.
Noise
Suppression
Noise suppression is recommended for
each relay contact switching inductive
loads; see page 15 for details.
Deadband
0-100% of span, user programmable
Time Delay
0 to 999.9 seconds, on & off relay time
delays
Programmable and independent for
each relay
Fail-Safe
Operation
Programmable and independent for
each relay.
Note: Relay coil is energized in non-
alarm condition. In case of power
failure, relay will go to alarm state.
Auto
Initialization
When power is applied to the meter,
relays will reflect the state of the input to
the meter.
Output Source
Process variable (PV), max, min, set
points 1-4, Modbus input, or manual
control mode
Scaling Range
1.000 to 23.000 mA for any display
range
Calibration
Factory calibrated: 4.000 to 20.000 = 420 mA output
Analog Out
Programming
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and
break
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/C max from 0 to 65C ambient,
0.8 µA/C max from -40 to 0C ambient
Note: Analog output drift is separate
from input drift.
Isolated
Transmitter
Power Supply
Terminals I+ & R: 24 VDC 10%. May be
used to power the 4-20 mA output or
other devices. Refer to Figure 21 on
page 19.
All models rated @ 40 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power
Minimum
Maximum
24 VDC
10
700
35 VDC
(external)
100
1200
Compatibility
EIA-485
Connectors
Removable screw terminal connector
Max Distance
3,937' (1,200 m) max
Status
Indication
Separate LEDs for Power (P), Transmit
(TX), and Receive (RX)
Slave ID
1 – 247 (Meter address)
Baud Rate
300 – 19,200 bps
Transmit Time
Delay
Programmable between 0 and 199 ms
Data
8 bit (1 start bit, 1 or 2 stop bits)
Parity
Even, Odd, or None with 1 or 2 stop bits
Byte-To-Byte
Timeout
0.01 – 2.54 second
Turn Around
Delay
Less than 2 ms (fixed)
Note: Refer to the Modbus Register Tables located at
www.apgsensors.com for details.
Isolated 4-20 mA Transmitter Output
Relays
RS485 Serial Communications Terminal
Modbus® RTU Serial Communications
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Large Digital Display Instruction Manual
Digital Input & Output Terminal
Channels
4 digital inputs & 4 digital outputs
Digital Input
Logic High
3 to 5 VDC
Digital Input
Logic Low
0 to 1.25 VDC
Digital Output
Logic High
3.1 to 3.3 VDC
Digital Output
Logic Low
0 to 0.4 VDC
Source Current
10 mA maximum output current
Sink Current
1.5 mA minimum input current
+5 V Terminal
To be used as pull-up for digital inputs
only. Connect normally open
pushbuttons across +5 V & DI 1-4.
WARNING!
DO NOT use +5 V
terminal to power
external devices.
UL & C-UL Listed
USA & Canada
UL 508 Industrial Control Equipment (United States),
C22.2 No. 142 (Canadian National Standard)
UL File Number
E160849
Front Panel
UL Type 4X, NEMA 4X, IP65
Low Voltage Directive
EN 61010-1:2010
Safety requirements for measurement, control, and laboratory use
Compliance Information
Safety
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Large Digital Display Instruction Manual
Caution: Read complete instructions
prior to installation and operation of the
meter.
Warning: Risk of electric shock or
personal injury.
Warning!
Hazardous voltages exist within enclosure.
Installation and service should be performed only by trained
service personnel.
!
Safety Information
Installation
There is no need to open the clear plastic front cover in order to complete the installation, wiring,
and setup of the meter. All programming is done through the buttons and switches located under
the lower door panel and are accessible by removing the single securing screw. Wires should be
run through the knockout holes located on the bottom of the meter.
There are a total of four pre-drilled conduit entry holes located at the bottom of the meter. If the
need to drill additional holes arises, make sure you will have the clearance necessary for conduit
mounting hardware.
Do not disconnect the RJ45 connector found on the right side of the meter wiring board. Doing so
will disable the onboard digital I/O, RS-485 serial communications, and M-Link functionality.
Instructions are provided for changing the transmitter power supply to output 5 or 10 VDC instead
of 24 VDC, see page 11.
Unpacking
Remove the meter from box. Inspect the packaging and contents for damage. Report damages, if
any, to the carrier. If any part is missing or the meter malfunctions, please contact your supplier or
the factory for assistance.
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Large Digital Display Instruction Manual
Wall Mounting Instructions
Figure 2. Meter
Dimensions - Side View
Figure 3. Meter Dimensions – Front View
2.63" (67 mm)
4.77"
(121.2 mm)
Mounting Hole Mounting Hole
Front Door
Panel Sc rew
10.63" (270 mm)
12.59" (319.7 mm)
10.43" (265 mm)
9.8" (249 mm)
11.14" (283 mm )
The meter can be mounted to any wall using the four provided mounting holes. Note that the bottom
mounting holes are located underneath the front door panel. To mount the meter to a wall, follow these
instructions.
1. Prepare a section of wall
approximately 11″ x 13″ (280 mm x
330 mm) for meter mounting by
marking with a pencil the mounting
holes (shown in the image to the
right) on the wall.
2. Using a drill bit slightly smaller than
the girth of the mounting screws,
pre-drill holes at the mounting
locations previously marked.
3. Insert mounting screws into the four
mounting holes and screw them into
the pre-drilled holes. Do not
overtighten the mounting screws
as it is possible that the enclosure
could crack and become damaged.
Figure 1. Meter Mounting Holes
Mounting Dimensions
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Large Digital Display Instruction Manual
Pipe Mounting Instructions
The meter can also be mounted to a pipe using the optional pipe mounting kit (PDA6260). This kit
includes two mounting plates, two U-bolts, and the necessary nuts and bolts. To mount the meter to a
pipe using the pipe mounting kit accessory, follow these instructions.
1. Secure the mounting plates to the top
and bottom (for vertical pipes) or left and
right (for horizontal pipes) of the reverse
side of the meter enclosure using the
provided fasteners. Do not overtighten
the fasteners as it could cause damage
to the enclosure.
2. Using the provided nuts and U-bolts,
secure the mounting plates to the pipe
enough torque such that the meter
cannot be moved up or down (or side to
side).
Figure 4. Vertical Pipe Mount Assembly
Figure 5. Horizontal Pipe Mount Assembly
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Large Digital Display Instruction Manual
Transmitter Supply Voltage Selection (P+, P-)
Caution
Use copper wire with 60°C or 60/75°C
insulation for all line voltage connections.
Observe all safety regulations. Electrical
wiring should be performed in accordance
with all applicable national, state, and local
codes to prevent damage to the meter and
ensure personnel safety.
MENU RESET
F1
MAX
F2
ENT ER
F3
All meters, including models equipped with the 12-24 VDC power option, are shipped from the factory
configured to provide 24 VDC power for the transmitter or sensor.
If the transmitter requires 5 or 10 VDC excitation, the switch labeled P+/P- must be configured
accordingly.
To access the voltage selection jumper:
1. Unplug the meter power.
2. Unscrew and open the front door panel.
3. Locate the P+/P- switch located in the center of the connections board (see diagram below).
4. Flip this switch into the appropriate position for the required transmitter excitation.
Figure 6. Transmitter Supply Voltage Selection
Connections
All connections are made to screw terminal connectors located under the front door panel. Remove the
single securing screw in order to access the wiring terminals.
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Large Digital Display Instruction Manual
Warning!
Do not connect any equipment other than Automation Products
Group’s expansion modules, cables, or meters to the RJ45 M-LINK
connector. Otherwise damage will occur to the equipment and the
meter.
Do not disconnect the RJ45 connector located to the left of the power
terminal block. Doing so will disable the onboard digital I/O, RS-485
serial communications, and M-Link functionality.
MENU RESET
F1
MAX
F2
ENTER
F3
AC or DC
POWER
Required External Fuse:
5 A max, 250 V Slow Blow
POWER
+
-
Connectors Labeling
The connectors’ label, affixed to the inside of the lower door panel, shows the location of all connectors
available with requested configuration.
Figure 7. Connector Labeling for Fully Loaded Meter
Power Connections
Power connections are made to a two-terminal connector labeled POWER on Figure 7 on page 12. The
meter will operate regardless of DC polarity connection. The + and - symbols are only a suggested wiring
convention.
Figure 8. Power Connections
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Large Digital Display Instruction Manual
Signal Connections
Signal connections are made to a six-terminal connector labeled SIGNAL on Figure 7. The COM
(common) terminal is the return for the 4-20 mA and the 10 V input signals.
Current and Voltage Connections
The following figures show examples of current and voltage connections.
There are no switches or jumpers to set up for current and voltage inputs. Setup and programming is
performed through the front panel buttons.
Figure 9. Transmitters Powered by Internal Supply
Figure 10. Transmitter Powered by Ext. Supply or Self-Powered
The current input is protected against current overload by a resettable fuse. The display may or may not
show a fault condition depending on the nature of the overload.
The fuse limits the current to a safe level when it detects a fault condition, and automatically resets itself
when the fault condition is removed.
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Large Digital Display Instruction Manual
-+
+
Voltage
Signal
mA+P-
21 3 54
P+ V+
COM
INPUT SIGNAL
mA+P-
21 3 54
P+ V+
COM
INPUT SIGNAL
3-Wire Voltage
Transducer
Signal
-
C NONO NC NC C
RELAY4 RELAY3
4 36 5 2 1
C NONO NC NC C
RELAY2 RELAY1
4 36 5 2 1
Figure 11. Voltage Input Connections
The meter is capable of accepting any voltage from -10 VDC to +10 VDC.
Modbus RTU Serial Communications
Serial communications connection can be made to the onboard RS485 terminal block or USB connector
shown in Figure 7. If RS232 is required, an RS485 to RS232 adapter (PDA7485) may be used. See
Ordering Information on page 4 for additional information.
Relay Connections
Relay connections are made to two six-terminal connectors labeled RELAY1 – RELAY4 in Figure 7.
Each relay’s C terminal is common only to the normally open (NO) and normally closed (NC) contacts of
the corresponding relay. The relays’ C terminals should not be confused with the COM (common) terminal
of the INPUT SIGNAL connector.
Figure 12. Relay Connections
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Large Digital Display Instruction Manual
Switching Inductive Loads
C
R
C
R
Use a diode with a reverse breakdown
voltage two to three times the circuit
voltage and forward current at least as
large as the load current.
The use of suppressors (snubbers) is strongly recommended when switching inductive loads to prevent
disrupting the microprocessor’s operation. The suppressors also prolong the life of the relay contacts.
Suppression can be obtained with resistor-capacitor (RC) networks assembled by the user or purchased
as complete assemblies. Refer to the following circuits for RC network assembly and installation:
Figure 13. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 Ω for each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:
1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid loads. Check to confirm proper operation.
3. Install the RC network at the meter's relay screw terminals. An RC network may also be installed
across the load. Experiment for best results.
RC Networks Available from Automation Products Group
RC networks are available from Automation Products Group and should be applied to each relay contact
switching an inductive load. Part number: PDX6901.
Note: Relays are de-rated to 1/14th HP (50 watts) with an inductive load.
Figure 14. Low Voltage DC Loads Protection
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Large Digital Display Instruction Manual
RS485 Output Connections
An RS-485 connector is provided for the use of advanced Modbus®
serial communications. This connector converts the serial output of
the meter to balanced, full or half-duplex RS-485 signals. It has a
removable screw terminal connector for the RS-485 terminals which
includes Transmit Data (DO) and (/DO), Receive Data (DI) and (/DI),
and Signal Ground. Baud rates are adjustable and handled by the
meter (see Modbus RTU Serial Communications on page 48 for
more information).
The RS-485 connector has three diagnostic LEDs: a Power (PWR) LED to show when the adapter is
powered properly, a Transmit Data (TX) LED to show when the adapter is sending data out from the PC
side, and a Receive Data (RX) LED to show when the adapter is receiving data from the meter.
Installation
Figure 15 shows the connection of a meter to a PC using the RS485 output connector and a PDA7485
RS-232 to RS-422/485 converter in an RS-422 network. Figure 16 shows the connection of several
meters to a PC using a PDA7485 RS-232 to RS-422/485 converter in an RS-485 network.
When using more than one meter in a multi-drop mode, each meter must be provided with its own unique
address. The meter address (Slave ID) may be programmed between 1 and 247. The transmit delay may
be set between 0 and 199 ms. The parity can be set to even, odd, or none with 1 or 2 stop bits.
To change the meter address:
1. Press and hold the Menu button for three seconds to access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SEriaL) menu is displayed and press Enter, Addres is displayed.
3. Press Enter to change meter address using Right and Up arrow buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run Mode.
Figure 15. RS-422 or RS-485 Wiring
Notes:
1. Termination resistors are optional and values depend on the cable length and characteristic
impedance. Consult the cable manufacturer for recommendations.
2. Refer to RS-232 to RS-422/485 Converter documentation for further details.
3. Use shielded cable, twisted-pairs plus ground. Connect ground shield only at one location.
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Large Digital Display Instruction Manual
Figure 16. RS-485 Two-Wire Multi-Drop Wiring
RS485 Connector to RS-422/485 Serial
Converter Connections
RS-422/485 Serial
Converter
PDA1485 RS-485
Adapter
DO DI DO DI DI DO DI DO
Figure 17. Connections for RS485
Connector to Serial Converter
Notes:
1. Termination resistors are optional and values depend on the cable length and characteristic
impedance. Consult the cable manufacturer for recommendations.
2. Refer to RS-232 to RS-485 Converter documentation for further details.
3. Use shielded cable, twisted-pair plus ground. Connect ground shield only at one location.
Connections
Figure 17 details the wiring connections from the RS-485
connector to an RS-422/485 serial converter (such as the
PDA7485 or PDA8485) for a four-wire network.
Three Wire Connection
In order to wire the 5 pins for use as a 3-wire half-duplex RS-485 connection, it is necessary to create a
jumper connection between DI – DO and DI- – DO- as shown below.
Figure 18. Three-Wire RS485 Connection
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Large Digital Display Instruction Manual
Digital I/O Connections
Digital inputs and outputs are provided in order to expand the functionality of the meter. Digital inputs are
made via a push button or switch connection to the appropriate digital input connector block and the +5
VDC block. Digital output connections are made by wiring from the appropriate digital output block to the
grounding terminal block.
Figure 19. Digital Input and Output Connections
F4 Digital Input Connections
Digital input F4 is also available on the meter. This digital input is connected with a normally open contact
across F4 and COM, or with an active low signal applied to F4.
Figure 20. F4 Digital Input Connections
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