Precision Digital Corporation Helios PD2-6363 User manual

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
•Large Display NEMA 4X, IP65 Wall Mounted Flow Rate/Totalizer
•Dual Pulse, Open Collector, NPN, PNP, TTL, Switch Contact, Sine Wave (Coil), Square Wave Inputs
•Large Dual-Line 6-Digit Display, 1.8" (46 mm) Readable from 100 Feet (30 Meters) Away
•Isolated 5, 10 or 24 VDC Flowmeter Power Supply
•4 Relays with Interlocking Capability + Isolated 4-20 mA Output Option
•Free PC-Based, On-Board, MeterView Pro USB Programming Software
•SunBright Display Standard Feature; Great for Outdoor Applications
•Rate, Total, and Grand Total for Each InputChannel
•Gate Function for Display of Slow Pulse Rates
•K-Factor, Internal Scaling, orExternal Calibration
•Operating Temperature Range: -40 to 65°C (-40 to 149°F)
•Conformal Coated PCBs for Dust and Humidity Protection
•UL & C-UL Listed. E160849; 508 Industrial Control Equipment
•Input Power Options: 85-265 VAC / 90-265 VDC or 12-24 VDC / 12-24 VAC
•ProgrammableDisplay, Function Keys & Digital Input
•On-Board USB & RS-485 Serial Communications
•Modbus RTU Communication Protocol Standard
•5 Digital Inputs & 4 Digital Outputs Standard
•Password Protection
•Light / Horn & Button Accessory
•Control Station Accessory for Remote Operation
•3-Year Warranty
MeterView Pro
USB Install

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
2
Disclaimer
The information contained in this document is
subject to change without notice. Precision Digital
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.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•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 his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2021 Precision Digital Corporation.
All rights reserved.
FREE MeterView Pro
Programming Software
The meter can be powered from the USB connection. When
using the USB connection, DO NOT apply AC or DC power to
the meter.
The easiest and quickest way to program your Helios
meter is to use the FREE MeterView Pro
programming software. This software is loaded into
the meter and connects and installs directly to your
PC with a USB cable. We recommend that the first
thing you do after taking the meter out of the box is
connect the Helios to your PC with the provided USB
cable –do not use a different cable. DO NOT apply
AC or DC power to the meter while your PC is
connected to the meter as it will disrupt the USB
connection. You don’t even have to apply an input
signal.
MeterView Pro programming software is intuitive, and
most customers can get their meter programmed as
they like without even looking in the manual.
Watch MeterView Pro Software Video at
www.predig.com/meterviewpro
In addition to programming, the software may be used
for:
•Monitoring
•Datalogging using your PC
•Generating and saving programming files for
later use
Once your meter is programmed the way you want it,
you can wire it up for your application per the
instructions in this manual and install it. If you find that
you need to make adjustments to the programming
after the meter is installed, you can use the front
panel buttons and the instructions in this manual to do
so.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
3
Table of Contents
Introduction..........................................................................................................6
Ordering Information...........................................................................................6
Specifications.......................................................................................................8
General.............................................................................................................8
Dual Pulse Inputs ............................................................................................9
Dual Rate/Totalizer........................................................................................10
Relays.............................................................................................................10
USB Connection............................................................................................10
Isolated 4-20 mA Transmitter Output ..........................................................11
RS-485 Serial Communications ...................................................................11
Modbus®RTU Serial Communications........................................................11
Digital Input (F4)............................................................................................11
Digital Inputs & Outputs ...............................................................................11
MeterView Pro Software................................................................................11
Compliance Information....................................................................................12
Safety..............................................................................................................12
Safety Information .............................................................................................12
Installation..........................................................................................................12
Unpacking......................................................................................................12
Wall Mounting Instructions ..........................................................................13
Mounting Dimensions..................................................................................13
Conduit Holes Location...............................................................................13
Pipe Mounting Instructions ..........................................................................14
Installation Overview.....................................................................................15
MeterView Pro Software................................................................................15
MeterView Pro Installation...........................................................................15
Flowmeter Supply Voltage Selection (P+, P-) .................................................16
Connections...................................................................................................17
Connectors Labeling ...................................................................................17
Power Connections.....................................................................................18
Signal Connections .....................................................................................18
Configure Input Type and Level Switches...................................................19
Relay Connections......................................................................................19
Switching Inductive Loads...........................................................................19
RS-485 Connections...................................................................................20
RS-485 Multi-Drop Connection ...................................................................20
RS-485 Serial Converters ...........................................................................20
Digital I/O Connections................................................................................21
F4 Digital Input Connections.......................................................................21
4-20 mA Output Connections......................................................................21
Analog Output Transmitter Power Supply...................................................22
Remote Operation of Meter.........................................................................22
Interlock Relay Feature...............................................................................22
Setup and Programming...................................................................................23
Overview.........................................................................................................23
LED Status Indicators...................................................................................23
Programming Buttons...................................................................................24
Display Functions & Messages....................................................................25
Main Menu......................................................................................................28
Setting Numeric Values ................................................................................28
Setting Up the Meter (setup)........................................................................29
Setting the Input Signal (Input)..................................................................30
Setting the Totalizer Features (total)........................................................30
Setting the Dual-Input Mode (nmode)..........................................................30
Setting the Rate, Total, & Grand Total Units/Tags (units).........................32
Setting the Decimal Point (dEc pt).............................................................32
Programming the Rate/Totalizer (prog)......................................................33
Setting the Display Parameters & Intensity (dsplay)..................................36
Display Intensity (d-Inty)...........................................................................36

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
4
Setting the Relay Operation (relay)............................................................37
Setting the Relay Assignment (asSign)......................................................37
Setting the Relay Action (Act).....................................................................37
Programming Set and Reset Points............................................................38
Setting Fail-Safe Operation.........................................................................38
Programming Time Delay............................................................................38
Relay and Alarm Operation Diagrams.........................................................39
High Alarm Operation (Set > Reset)................................................................39
Low Alarm Operation (Set < Reset)............................................................39
High Alarm with Fail-Safe Operation (Set > Reset).....................................39
Low Alarm with Fail-Safe Operation (Set < Reset) .....................................39
Time Delay Operation .................................................................................40
Total Relay Sampling Operation .................................................................40
Pump Alternation Control Operation ...........................................................41
Relay Operation Details................................................................................42
Overview .....................................................................................................42
Relays Auto Initialization.............................................................................42
Fail-Safe Operation.....................................................................................42
Front Panel LEDs........................................................................................42
Latching and Non-Latching Relay Operation ..............................................42
Non-Latching Relay (Auto) .........................................................................43
Non-Latching Relay with Manual Reset (A-nman).......................................43
Latching Relay (LatcH)...............................................................................43
Latching Relay with Clear (Lt-Clr)............................................................43
Acknowledging Relays................................................................................44
Setting Up the Interlock Relay (Force On) Feature.....................................44
Scaling the 4-20 mA Analog Output (Aout).................................................45
Reset Menu (reset).......................................................................................45
Manual Control Menu (Contrl).....................................................................45
Setting Up the Password (pass)...................................................................46
Protecting or Locking the Meter Functions..................................................46
Total Reset Password & Non-Resettable Total...........................................46
Making Changes to a Password Protected Meter.......................................46
Disabling Password Protection....................................................................46
Advanced Features Menu.............................................................................47
Advanced Features Menu & Display Messages..........................................47
Gate Function (Gate) ..................................................................................48
Contact De-Bounce Filter (FiLter).............................................................49
Rounding Feature (round)..........................................................................49
Modbus RTU Serial Communications (serial)..........................................49
Select Menu (SElect).................................................................................50
Input Signal Conditioning (Functn).............................................................50
Math Function (nmath)................................................................................51
Math Constants (Const)..............................................................................51
Low-Flow Cutoff (CutofF)...........................................................................51
Totalizer Count Up/Down (Count)...............................................................52
Analog Output Programming (AoutPr) .......................................................52
Programmable Function Keys User Menu (user).......................................53
Meter Operation .................................................................................................55
Button Operation...........................................................................................55
Function Keys Operation..............................................................................55
Digital Inputs Operation................................................................................55
Maximum/Minimum Readings......................................................................55
Troubleshooting.................................................................................................56
Diagnostics Menu (diag) ..............................................................................56
Testing the Display LEDs............................................................................56
Determining Software Version.....................................................................56
Reset Meter to Factory Defaults...................................................................56
Factory Defaults & User Settings................................................................57
Troubleshooting Tips....................................................................................59

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
5
Table of Figures
Figure 1. Meter Mounting Holes Location .......................................................13
Figure 2. Meter Mounting Holes Dimensions..................................................13
Figure 3. Meter Dimensions –Side View.........................................................13
Figure 4. Meter Dimensions - Front View ........................................................13
Figure 5. Conduit Holes Location –Bottom View...........................................13
Figure 6. Vertical Pipe Mount Assembly..........................................................14
Figure 7. Horizontal Pipe Mount Assembly.....................................................14
Figure 8. Flowmeter Supply Voltage Selection...............................................16
Figure 9. PD2-6363-6H0 / 7H0 Connectors Label............................................17
Figure 10. PD2-6363-6H7 / 7H7 Connectors Label..........................................17
Figure 11. Power Connections .........................................................................18
Figure 12. Flowmeters Powered by Internal Power Supply...........................18
Figure 13. Flowmeters Powered by External Supply......................................18
Figure 14. Self-Powered Magnetic Pickup Coil Flowmeter............................18
Figure 15. NPN open Collector Input ...............................................................18
Figure 16. PNP Sensor Powered by Internal Supply......................................18
Figure 17. Switch Input Connections...............................................................18
Figure 18. Relay Connections...........................................................................19
Figure 19. AC and DC Loads Protection..........................................................19
Figure 20. Low Voltage DC Loads Protection.................................................19
Figure 21. RS-485 Connection..........................................................................20
Figure 22. Five-Wire RS-485 Connections.......................................................20
Figure 23. Three-Wire RS-485 Multi-Drop Connections.................................20
Figure 24. Connections for RS-485 Connector to Serial Converter..............21
Figure 25. Three-Wire RS-485 Connection......................................................21
Figure 26. Digital Input and Output Connections...........................................21
Figure 27. F4 Digital Input Connections..........................................................21
Figure 28. 4-20 mA Output Connections .........................................................21
Figure 29. Analog Output Supply Powering Other Devices...........................22
Figure 30. Meter to PDA2364-MRUE Control Station Connection.................22
Figure 31. Interlock Connections.....................................................................22
Figure 32. Dual Input Mode (ud AB)..................................................................30
Figure 33. Dual Input Mode (ud AI)..................................................................30
Figure 34. Dual Input Mode (ud BI)..................................................................31
Figure 35. Dual Input Mode (quad 1)................................................................31
Figure 36. Dual Input Mode (quad 2)................................................................31
Figure 37. Dual Input Mode (quad 4)................................................................31

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
6
Introduction
The Helios PD2-6363 is a multi-purpose, easy to use,
large-display dual pulse input rate/totalizer ideal for
flow rate, total, and flow control 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 water-resistant, field-mountable NEMA 4X/IP65
rated enclosure for convenient indoor and outdoor
installation.
The programming buttons are located behind the
lower panel door and are not generally accessible
during operation. For that reason, we recommend the
use of the PDA2364-MRUE remote control station
which has four buttons to mimic the buttons behind
the panel.
The meter accepts two pulse (e.g. ±40 mV to ±8 V),
square wave (0-5 V, 0-12 V, or 0-24 V), open
collector, NPN, PNP, TTL or switch contact signals
from a pulse output flowmeter. The rates, as
measured by the flowmeters, are automatically
aggregated into cumulative totals and grand totals
which can be displayed with the rates.
Various math functions may be applied to the rate,
total, or grand totals of the two channels, including
addition, difference, absolute difference, average,
weighted average, multiplication, division, minimum,
maximum, draw, ratio, and concentration. This is in
addition to the input signal conditioning functions
(linear, square root, programmable exponent, or
round horizontal tank calculations).
The displays, relays, and the analog output may be
assigned to the rate, total, or grand total of input
channels A or B, or math result channel C. Three of
the programming buttons can be set for custom
operation.
A fully loaded Helios PD2-6363 rate/totalizer comes
with four SPDT relays, a 4-20 mA output, two 24 VDC
power supplies, five digital inputs and four digital
outputs, and RS-485 serial communications. The four
relays can be used for alarm indication or process
control applications. The 4-20 mA isolated output,
Modbus RTU serial communications, and digital I/O
features make the Helios an excellent addition to any
system.
Ordering Information
85-265 VAC Models
Model
Standard
Features
Options
Installed
PD2-6363-6H0
5 Digital Inputs,
4 Digital Outputs,
RS-485
Communications
No options
PD2-6363-6H7
4 relays
4-20 mA output
12-24 VDC Models
Model
Standard
Features
Options
Installed
PD2-6363-7H0
5 Digital Inputs,
4 Digital Outputs,
RS-485
Communications
No options
PD2-6363-7H7
4 relays
4-20 mA output
Accessories
Model
Description
PDA0004
Cable Gland
PDA7485-I
RS-232 to RS-485 isolated converter
PDA8485-I
USB to RS-485 isolated converter
PDAPLUG2
Plastic Conduit Plug
PDX6901
Snubber: 0.01 μF/470 Ω, 250 VAC
PDA2360 Control Stations
Model
Description
PDA2360-E
Emergency button
PDA2361-A
Ack button
PDA2361-B
Blank button
PDA2361-R
Reset button
PDA2361-T
Tare button
PDA2361-S
Stop button
PDA2361-Q
Silence button
PDA2362-AR
Ack and Reset buttons
PDA2362-BB
Two blank buttons
PDA2364-MRUE
Menu, right, up, enter buttons
Note: Control stations can be connected directly to the Helios meter’s
on-board digital inputs. See Remote Operation of Meter on page 22
for details.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
7
Light / Horn Accessories
Helios Meter Shown with MOD-PD2LHRB1 Red Light
/ Horn and Button. Meter Sold Separately.
Model
Description
MOD-PD2LHRB1
Red Light / Horn and Button
Mounted and Wired to Helios(1)
MOD-PD2LHGB1
Green Light / Horn and Button
Mounted and Wired to Helios(1)
MOD-PD2LHYB1
Yellow Light / Horn and Button
Mounted and Wired to Helios(1)
MOD-PD2LHBB1
Blue Light / Horn and Button
Mounted and Wired to Helios(1)
MOD-PD2LHWB1
White Light / Horn and Button
Mounted and Wired to Helios(1)
MOD-PD2LH5CB1
Light / Horn with User Choice of
Red, Green, Yellow, Blue or White
Light, Button, Mounted and Wired
to Helios(1)
MOD-
PD2LH3CB1-RYG
Light / Horn with Red, Yellow,
Green Light Layers, Button,
Mounted and Wired to Helios(1)
Note:
1. Specify MOD-PD2LH model as a separate item on the order for the
Helios to order the Light / Horn & Button accessory installed and
wired. Meter is sold separately.
9 labels are provided for the button.
Pipe Mounting Kit
Helios Meter Shown mounted to pipe using PDA6260
pipe mounting kit. See Pipe Mounting Instructions on
page 14 for details.
Model
Description
PDA6260
2" Pipe Mounting Kit for PD2
Signal Splitter & Conditioner Accessories
Model
Description
PD659-1MA-1MA
Signal Isolator with One 4-20 mA
Input and One 4-20 mA Output
PD659-1MA-2MA
Signal Splitter with One 4-20 mA
Input and Two 4-20 mA Outputs
PD659-1MA-1V
Signal Conditioner with One
4-20 mA Input and One 0-10 VDC
Output

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
8
Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Display
Dual-line: 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
Default value is six.
Display
Update Rate
Rate: 10 per second; up to 1 per 100
seconds (and is a function of Low Gate
setting); Total: 10 per second (fixed)
LED Status
Indicators
See LED Status Indicators on page 23 for
details.
Overrange
Display flashes 999999
Display
Assignment
Display lines 1 & 2 may be assigned to show:
•One or more rate channels: Channel A
(Ch-A), B (Ch-B), or C (Ch-C)
•Toggle between rate channels: Ch-A &
Ch-B, Ch-A & Ch-C, Ch-B & Ch-C, and
Ch-A, Ch-B, & Ch-C
•Total or grand total: Ch-A or Ch-B
•Rate and total or grand total: Ch-A, Ch-B
•Relay set points
•Max/min values: Ch-A, Ch-B, or Ch-C
•Toggle between any rate channel & units
•Total and units: Ch-A or Ch-B
•Toggle between totals: Ch-A & Ch-B;
Ch-A, Ch-B, and sum of Ch-A and Ch-B
•Modbus input
Line 2 may also be set to show engineering
units or be off, with no display.
Programming
Methods
Four programming buttons, digital inputs,
PC and MeterView Pro software, or Modbus
registers.
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.
Rounding
Select 1, 2, 5, 10, 20, 50, or 100
(e.g. rounding = 10, value = 123.45,
display = 123.50).
Password
Three programmable passwords restrict
modification of programmed settings and
two prevent resetting the totals.
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.
Total: Prevents resetting the total manually
Gtotal: Prevents resetting the grand total
manually
Non-Volatile
Memory
All programmed settings are stored in non-
volatile memory for a minimum of ten years
if power is lost.
Power
Options
85-265VAC50/60Hz;90-265VDC,20Wmax;
12-24 VDC, 12-24 VAC, 15 W max.
Powered over USB for configuration only.
Fuse
Required external fuse: UL Recognized, 5 A
max, slow blow; up to 6 meters may share
one 5 A fuse
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 65°C
Storage temperature range:
-40 to 85°C
Relative humidity:
0 to 90% non-condensing
Note: Printed circuit boards are conformally
coated.
Connections
Power, signal, relays, mA out: Removable
screw terminal blocks accept 12 to 22 AWG
wire.
RS-485: Removable screw terminal block
accepts 16 to 30 AWG wire.
Digital I/O: Non-removable screw terminal
blocks accept 16 to 30 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 13 for additional
details.
Pipe Mounting:
Optional pipe mounting kit (PDA6260)
allows for pipe mounting. Sold separately.
See Pipe Mounting Instructions on page 14
for additional details.
Tightening
Torque
Power, signal, relays, mA out terminals:
5 lb-in (0.56 Nm)
Digital I/O and RS-485:
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
3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
9
Dual Pulse Inputs
Two Inputs
Field selectable: Pulse or square wave
0-5 V, 0-12 V, or 0-24 V @ 30 kHz; TTL;
open collector 4.7 kpull-up to 5 V @
30 kHz; NPN or PNP transistor, switch
contact 4.7 kpull-up to 5 V @ 40 Hz;
Modbus PV (Slave)
Isolated
Flowmeter
Power Supply
Terminals P+ & P-: 24 VDC 10%.
All models selectable for 24, 10, or 5 VDC
supply (Switch labeled P+/P-). 85-265 VAC
models rated @ 200 mA max, 12-24 VDC
powered models rated @ 100 mA max.
5 & 10 VDC supply rated @ 50 mA max.
Refer to Flowmeter Supply Voltage
Selection (P+, P-) on page 16.
When the Light / Horn is powered by the
flowmeter power supply, see MOD-PD2LH
Light / Horn's transmitter power supply
specification in MOD-PD2LH manual for
additional details. Light / Horn power not
available for 5 or 10 VDC supplies.
Channels
Channel A, Channel B,
Channel C (Math channel)
Programmable
Constants
Constant P (Adder):
-99.999 to 999.999, default: 0.000
Constant F (Factor):
0.001 to 999.999, default: 1.000
Math
Functions
Name
Function
Setting
Addition
(A+B+P)*F
Sunm
Difference
(A-B+P)*F
diF
Absolute diff.
((Abs(A-B))+P)*F
diFAbS
Average
(((A+B)/2)+P)*F
AVG
Multiplication
((A*B)+P)*F
nmulti
Division
((A/B)+P)*F
diVide
Max of A or B
((AB-Hi)+P)*F
Hi-Ab
Min of A or B
((AB-Lo)+P)*F
Lo-Ab
Draw
((A/B)-1)*F
drAuw
Weighted avg.
((B-A)*F)+A
uw avg
Ratio
(A/B)*F
ratio
Ratio 2
((B-A)/A)+P)*F
ratio2
Concentration
(A/(A+B))*F
Concen
Total Addition
(tA+tB+P)*F
Sunm t
G. Tot. Addition
(GtA+GtB+P)*F
SunmGT
Total
Difference
(tA-tB+P)*F
Dif GT
G. Tot.
Difference
(GtA-GtB+P)*F
Dif GT
Total Ratio
(tA/tB)*F
Tratio
Total Ratio 2
((tB-tA)/tA)*F
t-rat2
Total Percent
(tA/(tA+tB))*100
T PCT
Note: The F constant can be any value from
0.001 to 999.999. If the value is less than 1,
it willhave the same effect as a divider. For
example, the average could also be derived
by using (A+B)*F, where F = 0.500.
Low Voltage
Mag Pickup
Sensitivity: 40 mVp-p to 8Vp-p
Minimum
Input
Frequency
0.001 Hz
Minimum frequency is dependent on high
gate setting.
Maximum
Input
Frequency
30,000 Hz (10,000 for low voltage mag
pickup)
Input
Impedance
Pulse input: Greater than 300 k@ 1 kHz.
Open collector/switch input: 4.7 kpull-up
to 5 V.
Input
Threshold
Low
High
1.6 V
3.3 V
Sequence of
Operations
for Input
Programming
1. Select Input for A and B
2. Set up the rate, total, and grand total
engineering units for channels A & B,
and units for math channel C
3. Set up rate, total, and grand total
decimal points for channels A & B,
and decimal point for math channel C
4. Program channel A & B rate
parameters
5. Program channel A & B total and reset
parameters
6. Set up display lines 1 & 2 and display
intensity
7. Select the transfer function for A & B
(e.g. Linear)
8. Select Math function for Channel C
9. Program constants for Factor (F) and
Adder (P).
10. Program cutoff values for A and B
Accuracy
±0.03% of calibrated span ±1 count
Temperature
Drift
Rate display is not affected by changes in
temperature.
Multi-Point
Linearization
2 to 32 points for channel A and B
Low-Flow
Cutoff
0.1 to 999,999 (0 disables cutoff function).
Point below at which the display always
shows zero.
Decimal Point
Up to five decimal places or none:
d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Calibration
May be calibrated using K-factor, scaling
without a signal source, or by applying an
external calibration signal.
K-Factor
Field programmable K-factor converts input
pulses to rate in engineering units. May be
programmed from 0.00001 to 999,999
pulses/unit.
Calibration
Range
Input 1 signal may be set anywhere in the
range of the meter; input 2 signal may be
set anywhere above or below input 1
setting.
Minimum input span between any two
inputs is 1.0 Hz for calibration and 0.1 Hz
for scaling. An error message will appear if
the input span is too small.
Filter
Programmable contact de-bounce filter:
40 to 999 Hz maximum input frequency
allowed with low speed filter.
Time Base
Second, minute, hour, or day
Gate
Low gate: 0.1-99.9 seconds
High gate: 2.0-999.9 seconds
3.3 V
1.6 V
0 V

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
10
Dual Rate/Totalizer
Rate Display
Indication
-99999 to 999999, lead zero blanking.
Total Display
& Total
Overflow
0 to 999,999; automatic lead zero
blanking.
Up to 999,999,999 with total-overflow
feature. “oF” is displayed to the left of total
overflow and ▲ LED is illuminated.
Total
Decimal Points
Up to five decimal places or none:
d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Total decimal point is independent of rate
decimal point. Channel A and B decimal
points programmed independently.
Dual Totalizer
Calculates total for channels A and B
based on rate and field programmable
multiplier to display total in engineering
units. Time base must be selected
according to the time units in which the
rate is displayed. Channel A and B
totalizer parameters programmed
independently.
Totalizer
Rollover
Totalizer rolls over when display exceeds
999,999,999. Relay status reflects
display.
Total
Overflow
Override
Program total A or B total reset for
automatic with 0.1 second delay and set
point 1 for 999,999
Totalizer
Alarm Presets
Up to eight, user selectable under setup
menu. Any set point can be assigned to
channel A or B total or grand total (or C)
and may be programmed anywhere in
the range of the meter for total alarm
indication.
Total & Grand
Total Reset
Via front panel button, external contact
closure on digital inputs, automatically via
user selectable preset value and time
delay, or through serial communications.
Channel A and B total and grand total
reset parameters programmed
independently.
Total Reset
Password
Total and grand total passwords may be
entered to prevent resetting the totals or
grand totals from the front panel.
Programmable
Delay
On Release
0.1 and 999.9 seconds; applied to the
first relay assigned to total or grand total.
If the meter is programmed to reset total
to zero automatically when the preset is
reached, then a delay will occur before
the total is reset.
Non-Resettable
Total
The grand totals can be programmed as
non-resettable totals by entering the
password “050873”. Both channels are
set to non-resettable when this password
is entered.
•Once the Grand Total has been programmed as “non-
resettable” the feature CANNOT be disabled.
Relays
Rating
4 SPDT (Form C) internal and rated 3 A
@ 30 VDC and 125/250 VAC resistive load;
1/14 HP (≈50 W) @ 125/250 VAC for
inductive loads
Noise
Suppression
Noise suppression is recommended for each
relay contact switching inductive loads; see
Switching Inductive Loads on page 19.
Relay
Assignment
Relays may be assigned to channel A or B
rate, total, or grand total; channel C; or
Modbus control.
Deadband
0-100% of span, user programmable
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 or without clear
•Pump alternation control (2-4 relays)
•Sampling (based on set point and time)
•Off (disable unused relays and enable
Interlock feature)
•Manual on/off control mode
Relay Reset
(Acknowledge)
User selectable via front panel button, F4
digital input, external contact closure on
digital inputs, or through serial
communications.
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 (L)
Note: Front panel button, F4 terminal at
back of meter or digital input may be
assigned to acknowledge relays
programmed for manual reset.
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.
USB Connection
Function
Programming only
Compatibility
USB 2.0 Standard, Compliant
Connector
Type
Type B receptacle
Cable
USB Type A-B cable
Driver
Microsoft®Windows®XP/Vista/7/8/10
Power
USB port provides power to the meter.
DO NOT apply AC or DC power to the
meter while the USB port is in use.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
11
Isolated 4-20 mA Transmitter
Output
Output
Source
Input channels A or B, rate, total, or grand
total; channel C; max or min for channel A
or B; highest or lowest max or min of A and
B; 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 = 4-20 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 65C ambient,
0.8 µA/C max from -40 to 0C ambient
Note: Analog output drift is separate from input
drift.
Isolated
Transmitter
Power Supply
TerminalsI+&R:24VDC10%.May be
used to power the 4-20 mA output or other
devices.
All modelsrated @ 40mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply
Minimum
Maximum
24 VDC
10 
700 
35 VDC
(external)
100 
1200 
0-10 VDC
Output
The PD659-1MA-1V can convert the
optional 4-20 mA output to a 0-10 VDC
output
RS-485 Serial Communications
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)
Modbus®RTU Serial
Communications
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 Helios Modbus Register Tables located
at www.predig.com for details.
Digital Input (F4)
Function
Remote operation of front-panel buttons,
acknowledge/reset relays, reset totals,
reset max/min values. See Function Keys &
Digital I/O Available Settings on page 53 for
a complete list of capabilities.
Contacts
3.3 VDC on contact. Connect normally
open contacts across F4 to COM
Logic Levels
Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC
Digital Inputs & Outputs
Function
Terminals provided for remote operation of
all four programming / operation buttons
(use PDA2364-MRUE control station).
Other uses include acknowledge/reset
relays and reset max/min values. See
Function Keys & Digital I/O Available
Settings on page 53 for a complete list of
capabilities.
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 push buttons
across +5 V & DI 1-4.
•DO NOT use +5 V terminal to power external
devices.
MeterView Pro Software
Availability
Download directly from meter or from
www.predig.com/download_software
System
Requirements
Microsoft®Windows®XP/Vista/7/8/10
Communications
USB 2.0 (for programming only)
(Standard USB A to USB Type B)
RS-485 to USB converter
(programming, monitoring, and data
logging)
Configuration
Configure meters one at a time
Power
USB port provides power to the meter.
DO NOT apply AC or DC power to the
meter while the USB port is in use.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
12
Compliance Information
Safety
UL & C-UL
Listed
USA & Canada
UL 508 Industrial Control Equipment
(USA)
C22.2 No. 142 (Canadian National
Standard)
UL File Number
E160849
Enclosure
UL Type 4X, NEMA 4X, IP65
Low Voltage
Directive
EN 61010
Safety requirements for measurement,
control, and laboratory use
Safety Information
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•Hazardous voltages exist within enclosure.
Installation and service should be performed only
by trained service personnel.
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
using MeterView Pro software or 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, see Figure 5. Conduit Holes
Location –Bottom View on page 13 for details.
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 on-board digital I/O, RS-485 serial
communications, and M-Link functionality.
Instructions are provided for changing the
flowmeter power supply to output 5 or 10 VDC
instead of 24 VDC. See Figure 8. Flowmeter
Supply Voltage Selection on page 16.
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.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
13
Wall Mounting Instructions
The meter can be mounted to any wall using the four
provided mounting holes. Note that the bottom
mounting holes are located underneath the lower door
panel. To mount the meter to a wall, follow these
instructions
•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 Figure 1) on the wall.
•Select the appropriate mounting screws for the
mounting surface to be used. The mounting holes
diameter is shown on Figure 2.
Note: Mounting screws are not included.
•Using a drill bit slightly smaller than the girth of
the mounting screws, pre-drill holes at the
mounting locations previously marked.
•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 Location
Figure 2. Meter Mounting Holes Dimensions
Mounting Dimensions
Figure 3. Meter Dimensions –Side View
Figure 4. Meter Dimensions - Front View
Conduit Holes Location
Figure 5. Conduit Holes Location –Bottom View
Mounting Hole
Mounting Hole
Mounting Hole
Mounting Hole
Lower
Door
Panel
10.43" (265 mm)
9.8" (249 mm)
11.14" (283 mm)
Dia. 0.2"
(5.5 mm)
Dia. 0.2"
(5.5 mm)
2.63" (67 mm)
4.77"
(121.2 mm)
10.63" (270 mm)
12.59" (319.7 mm)
Mounting HoleMounting Hole
Lower
Door
Panel
Plugged
Holes Unplugged Holes
1.1"
(27.9 mm)
1.99"
(50.5 mm)
0.9"
(23 mm) Ø0.74" (18.9 mm) Drill or Punch-Out Holes

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
14
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.
•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.
•Using the provided nuts and U-bolts, secure the
mounting plates to the pipe applying enough
torque such that the meter cannot be moved up
or down (or side to side).
Figure 6. Vertical Pipe Mount Assembly
Figure 7. Horizontal Pipe Mount Assembly
Mounting Plate U-Bolt
Pipe
U-Bolt
Back of
Meter
Mounting Plate
Mounting
Plate Mounting
Plate
Pipe
Back of
Meter U-BoltU-Bolt

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
15
Installation Overview
We recommend the following sequence for getting the
meter into service:
1. DO NOT apply AC or DC power to the meter.
2. Connect the meter to the PC with the USB cable
provided. DO NOT use a different USB cable.
3. If MeterView Pro (MVPro) is already installed in
your computer, then the program will launch
automatically in most systems. If the program
does not start automatically, double-click on the
MVPro icon.
4. If MVPro is not installed, follow the instructions
provided below.
5. Use MVPro to configure the meter for your
application.
6. Disconnect the USB cable from the meter.
7. Apply power and signal and check operation of
the meter.
8. Install the meter and put into service.
9. Make any programming adjustments using the
front panel buttons.
MeterView Pro Software
The easiest and quickest way to program your Helios
meter is to use the FREE MeterView Pro
programming software. This software is loaded into
the meter and connects and installs directly to your
PC with the USB cable provided. DO NOT use a
different USB cable. We recommend that the first
thing you do after taking the meter out of the box is
connect the Helios to your PC with the provided USB
cable. DO NOT apply AC or DC power to the meter
while your PC is connected to the meter as it will
disrupt the USB connection. It is not necessary to
apply an input signal.
MeterView Pro programming software is intuitive, and
most customers can get their meter programmed as
they like without even looking in the manual.
Watch Meterview Pro Software Video at
www.predig.com/meterviewpro
MeterView Pro Installation
1. Connect one end of the provided USB cable
to the meter and the other end to the
computer. The computer will automatically
install the driver software it needs to talk to
the meter. Follow the on-screen instructions
and allow sufficient time for the process to
complete. This can take a few minutes. If the
process is interrupted, then it could leave the
system in an unstable condition.
•Only one meter may be connected at a time.
Attaching multiple meters will cause a conflict
with the meter software.
•DO NOT apply AC or DC power to the meter
when using the USB connection.
2. Once the driver is installed, an AutoPlay
dialog should appear for the drive
“MAINSTAL.” Click “Open folder to view
files.”
If the computer does not display an AutoPlay
dialog for the drive “MAINSTAL,” you should
open My Computer and double-click on the
drive labeled “MAINSTAL.”
3. Double-click on the file named “MAStart.”
The program will open a few windows and
install two programs on your computer.
Simply follow the on-screen instructions until
you see one of the dialogs below. If you
receive a “User Account Control” warning,
click “Yes.”
4. If there is an update available, click the
“Update” button to install the new version.
Otherwise, click “Configure” to begin
programming your meter.
Note: If you decide to update your MeterView Pro
software, once the installation has completed, you
will be asked if you want to update the setup files
located on the meter itself. This way, you will
always have the most current version on the meter
for future installs.
•DO NOT unplug the meter while the new
installation files are being written to it. The meter
will display uwrite during the process and you
will receive an on-screen notification once the
process is complete.

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
16
Flowmeter Supply Voltage
Selection (P+, P-)
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 flowmeter or sensor.
If the flowmeter requires 5 or 10 VDC excitation,
the switch labeled P+/P- must be configured
accordingly.
To access the voltage selection switch:
1. Turn off the power to the meter.
2. Unscrew and open the lower 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 flowmeter
excitation.
Figure 8. Flowmeter Supply Voltage Selection
P+/P-
24V 10V 5V
MENU RIGHT UP ACK
MENU RESET
F1
MAX
F2
ENTER
F3

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
17
Connections
All connections are made to screw terminal connectors located under the lower door panel. Remove the single
securing screw in order to access the wiring terminals.
•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.
Connectors Labeling
The connectors’ label, affixed to the inside of the lower door panel, shows the location of all connectors available with
the ordered configuration.
•DO NOT connect any equipment 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 on-board digital I/O, and the RS-485 serial communications.
Figure 9. PD2-6363-6H0 / 7H0 Connectors Label
Figure 10. PD2-6363-6H7 / 7H7 Connectors Label
+-
21
1
2
3
4
5
6
7
8
P+/P-
24V 10V 5V
M-LINK
USB
MENU RIGHT UP ACK
POWER
AB
P- F4P+
3412 57869
S1+ S1- COM S2+ S2-COM
Ch-A Ch-B
SIGNAL
MENU RESET
F1
MAX
F2
ENTER
F3
RS-485
DIGITAL I/O PWR TX RX
DI DI DO DO
O1 O2 O3 O4 G
I1I2I3I4
+5
__ __
MENU RESET
F1
MAX
F2
ENTER
F3
+-
21
1
2
3
4
5
6
7
8
P+/P-
24V 10V 5V
M-LINK
USB
MENU RIGHT UP ACK
POWER
AB
RI-I+ NO
NC
CNO
NC
CNONCCNO
NCC
MA OUT
21 3 43 6521 RELAY4RELAY3 43 6521
RELAY2RELAY1
P- F4P+
3412 57869
S1+ S1- COM S2+ S2-COM
Ch-A Ch-B
SIGNAL
MENU RESET
F1
MAX
F2
ENTER
F3
RS-485
DIGITAL I/O PWR TX RX
DI DI DO DO
O1 O2 O3 O4 G
I1I2I3I4
+5
__ __
MENU RESET
F1
MAX
F2
ENTER
F3

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
18
Power Connections
Power connections are made to a two-terminal
connector labeled POWER. The meter will operate
regardless of DC polarity connection. The + and -
symbols are only a suggested wiring convention. There
are separate models for low voltage and high voltage
power. See Ordering Information on page 6for
details.
Figure 11. Power Connections
Signal Connections
Signal connections are made to a nine-terminal
connector labeled SIGNAL. The COM (common)
terminals are the return for certain input signals. The
two COM terminals connect to the same common
return, and are not isolated.
The following figures show examples of signal
connections.
Setup and programming is performed through the
programming buttons or MeterView Pro software.
Figure 12. Flowmeters Powered by Internal Power
Supply
Figure 13. Flowmeters Powered by External
Supply
Figure 14. Self-Powered Magnetic Pickup Coil
Flowmeter
Figure 15. NPN open Collector Input
Figure 16. PNP Sensor Powered by
Internal Supply
Figure 17. Switch Input Connections
AC or DC
POWER
Required External Fuse:
5 A max, 250 V Slow Blow
POWER
+-

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
19
Configure Input Type and Level
Switches
Channel A and B each have an internal input type
configuration switch. These switches must be set to
the correct input type and level. Each switch can be
set for mV, PNP, or NPN. For details on what input
type to select, see Signal Connections starting on
page 18.
Relay Connections
Relay connections are made to two six-terminal
connectors labeled RELAY1 –RELAY4. 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 18. Relay Connections
Switching Inductive Loads
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 19. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 Ωfor 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.
Figure 20. Low Voltage DC Loads Protection
RC Networks Available from
Precision Digital
RC networks are available from Precision Digital 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.
CNONO NC NC C
RELAY4 RELAY3
4 36 5 2 1
CNONO NC NC C
RELAY2 RELAY1
4 36 5 2 1
C
R
C
R

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
20
RS-485 Connections
The RS-485 connections are made to a five terminal
connector used for Modbus®RTU serial
communications. The RS-485 terminals include
Transmit Data (DO) and (/DO), Receive Data (DI) and
(/DI), and Signal Ground. See Modbus RTU Serial
Communications (serial) on page 49 for more
information.
There are three diagnostic LEDs: Power (PWR)
Transmit Data (TX), and Receive Data (RX) to show
when the meter is transmitting and receiving data
from other devices.
Figure 21. RS-485 Connection
RS-485 Multi-Drop Connection
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) can be
programmed between 1 and 247. The transmit delay
can 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.
RS-485 Serial Converters
To convert the RS-485 to RS-232, use the PDA7485-I
converter. To convert the RS-485 to USB, use the
PDA8485-I converter. See Ordering Information on
page 6for additional information.
RS-485 Connection Examples
Figure 22. Five-Wire RS-485 Connections
Figure 23. Three-Wire RS-485 Multi-Drop
Connections
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
RS-485
PWR TX RX
DI DI DO DO
__ __
Shield
RS-232 Serial
Connection
to PC
R
R
Twisted-Pair
R
DI DI DO DO
__ __
RS-232 to RS-485
Converter
DI
DIDO DO
R
Shield
Twisted-Pair
R
Meter #1
DI DI DO DO
__ __ DI DI DO DO
__ __
Last Meter
RS-232 Serial
Connection
to PC
R
RS-232 to RS-485
Converter
DI
DIDO DO