Dwyer Instruments Series APM User manual

Bulletin: L-APM
Series APM Analog Panel Meter
Instruction Manual
DWYER INSTRUMENTS, INC.
Phone: [phone] dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A.
Fax: [phone]
e-mail: [e-mail]
•1/8 DIN Digital Panel Flow Rate/Totalizers with NEMA 4X, IP65 Front
•0-20 mA, 4-20 mA, 0-5 V, 1-5 V, and ±10 V Inputs
•Dual-Line 6-Digit Display, 0.6" (15 mm) & 0.46" (12 mm)
•Isolated 24 VDC @ 200 mA Transmitter Power Supply
•2 or 4 Relays with Interlocking Capability + Isolated 4-20 mA Output Options
•Free PC-Based, On-Board, Panel Meter Pro USB Programming Software
•No Assembly Required
•Display Rate & Total at the Same Time
•Rate in Units per Second, Minute, Hour, or Day
•Total, Grand Total or Non-Resettable Grand Total
•Front Panel or Remote Total Reset
•Password Protection for Total Reset
•Total Stored in Non-Volatile Memory
•Assign Any Relay for Rate or Total
•4-20 mA Output for Rate or Total
•Sampling Relay
•Display Open Channel Flow with Programmable Exponent Feature
•32-Point Linearization & Square Root Extraction
•Optional SunBright Display Models for Outdoor Applications
•Operating Temperature Range: -40 to 65°C (-40 to 149°F)
•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
•Programmable Display, Function Keys & Digital Input
•External 4-Relay & Digital I/O Modules
•RS-232 & RS-485 Serial Communication Options with Modbus RTU
•Wide Assortment of NEMA 4X Enclosures for up to Ten Meters
•3-Year Warranty

Series APM Analog Panel Meter Instruction Manual
2
Disclaimer
The information contained in this document is
subject to change without notice. Dwyer
Instruments, Inc. 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.dwyer-inst.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. Dwyer Instruments,
Inc. shall not be held liable for damages resulting
from such improper use.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Dwyer Instruments, Inc. warrants this product
against defects in material or workmanship for
the specified period under “Specifications” from
the date of shipment from the factory. Dwyer
Instruments’ 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.dwyer-inst.com for complete details.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2020 Dwyer Instruments, Inc.
All rights reserved.
FREE Panel Meter Pro
Programming Software
The meter can be powered from the Micro USB connection.
When using the Micro USB connection, DO NOT apply AC or DC
power to the meter.
The easiest and quickest way to program your MPM
meter is to use the FREE Panel Meter 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 MPM 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.
Panel Meter Pro programming software is intuitive,
and most customers can get their meter programmed
as they like without even looking in the manual.
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.

Series APM Analog Panel Meter Instruction Manual
3
Table of Contents
Introduction......................................................................................................... 6
Using the APM Like an MPM Process Meter................................................ 6
Ordering Information.......................................................................................... 6
Specifications ..................................................................................................... 7
General............................................................................................................ 7
Process Input ................................................................................................. 8
Rate/Totalizer.................................................................................................. 8
Relays.............................................................................................................. 9
Isolated 4-20 mA Transmitter Output ........................................................... 9
USB Connection........................................................................................... 10
On-Board Digital Input (F4) ......................................................................... 10
Modbus®RTU Serial Communications....................................................... 10
Panel Meter Pro ............................................................................................ 10
Compliance Information................................................................................... 11
Safety ............................................................................................................ 11
Electromagnetic Compatibility.................................................................... 11
Safety Information ............................................................................................ 11
Installation......................................................................................................... 11
Unpacking..................................................................................................... 11
Panel Mounting Instructions ....................................................................... 12
Mounting Dimensions ................................................................................ 12
Installation Overview ................................................................................... 13
Panel Meter Pro Software ............................................................................ 13
Panel Meter Pro Installation....................................................................... 13
Transmitter Supply Voltage Selection (P+, P-) .......................................... 14
Connections ................................................................................................. 14
Connectors Labeling .................................................................................. 14
Power Connections.................................................................................... 15
Signal Connections .................................................................................... 15
Modbus RTU Serial Communications ........................................................ 15
Relay Connections..................................................................................... 15
Switching Inductive Loads.......................................................................... 16
F4 Digital Input Connections...................................................................... 16
4-20 mA Output Connections..................................................................... 16
Analog Output Power Supply..................................................................... 16
External Relay & Digital I/O Connections................................................... 17
Interlock Relay Feature.............................................................................. 17
Setup and Programming.................................................................................. 18
Front Panel Buttons and Status LED Indicators........................................ 18
Display Functions & Messages................................................................... 19
Main Menu..................................................................................................... 21
Setting Numeric Values ............................................................................... 21
Setting Up the Rate/Totalizer Meter (setup)............................................... 21
Setting the Input Signal (Input)................................................................. 22
Setting the Totalizer Features (total)....................................................... 22
Setting the Display Units or Custom Tags (units) .................................... 22
Setting the Decimal Point (dEc.pt) ............................................................. 23
Programming the Rate/Totalizer (prog)..................................................... 23
Setting the Display Parameter & Intensity (dsplay) .................................. 25
Display Intensity (d-Inty).......................................................................... 25
Setting the Relay Operation (relay).......................................................... 26
Relay Assignment (Assign)....................................................................... 26
Setting the Relay Action............................................................................. 26
Programming Set and Reset Points........................................................... 27
Setting Fail-Safe Operation........................................................................ 27
Programming Time Delay .......................................................................... 27
Relay Action for Loss of 4-20 mA Input (Loop Break)................................ 27

Series APM Analog Panel Meter Instruction Manual
4
Relay and Alarm Operation Diagrams........................................................ 28
High Alarm Operation (Set > Reset) .............................................................. 28
Low Alarm Operation (Set < Reset) ........................................................... 28
High Alarm with Fail-Safe Operation (Set > Reset).................................... 28
Low Alarm with Fail-Safe Operation (Set < Reset)..................................... 28
Time Delay Operation ................................................................................ 29
Rate Relay Sampling Operation................................................................. 29
Total Relay Sampling Operation ................................................................ 29
Relay Operation Details ............................................................................... 30
Overview.................................................................................................... 30
Relays Auto Initialization............................................................................ 30
Fail-Safe Operation.................................................................................... 30
Front Panel LEDs....................................................................................... 30
Latching and Non-Latching Relay Operation ............................................. 30
Non-Latching Relay (Auto) ........................................................................ 31
Non-Latching Relay with Manual Reset (A-nman)...................................... 31
Latching Relay with Clear (LatcH) ............................................................. 31
Latching Relay (Lt-Clr)............................................................................ 31
Acknowledging Relays............................................................................... 32
Setting Up the Interlock Relay (Force On) Feature .................................... 32
Scaling the 4-20 mA Analog Output (Aout) ................................................ 33
Reset Menu (reset)...................................................................................... 33
Manual Control Menu (Contrl) ................................................................... 33
Setting Up the Password (pass).................................................................. 34
Protecting or Locking the Meter ................................................................. 34
Total Reset Password & Non-Resettable Total.......................................... 34
Making Changes to a Password Protected Meter...................................... 34
Disabling Password Protection .................................................................. 34
Advanced Features Menu............................................................................ 35
Advanced Features Menu & Display Messages......................................... 35
Noise Filter (filter) ................................................................................. 36
Noise Filter Bypass (bypass)..................................................................... 36
Rounding Feature (round) ......................................................................... 36
Modbus RTU Serial Communications (serial)......................................... 36
Select Menu (SElEct)................................................................................ 37
Input Signal Conditioning (Functn)............................................................ 37
Low-Flow Cutoff (CutofF).......................................................................... 38
Totalizer Count Up/Down (Count).............................................................. 38
Analog Output Programming (AoutPr) ...................................................... 38
Programmable Function Keys User Menu (user) ...................................... 39
Internal Source Calibration (ICAL) ............................................................. 40
Meter Operation ................................................................................................ 41
Front Panel Buttons Operation ................................................................... 41
Function Keys Operation............................................................................. 41
F4 Operation ................................................................................................. 41
Maximum/Minimum Readings..................................................................... 41
Totalizer Overflow Displays Total to 9 Digits............................................. 41
Troubleshooting ............................................................................................... 42
Diagnostics Menu (diag) ............................................................................. 42
Determining Software Version ................................................................... 42
Reset Meter to Factory Defaults.................................................................. 42
Factory Defaults & User Settings............................................................... 43
Troubleshooting Tips................................................................................... 44

Series APM Analog Panel Meter Instruction Manual
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Table of Figures
Figure 1: 1/8 DIN Panel Cutout and Mounting................................................ 12
Figure 2. Meter Dimensions - Side View......................................................... 12
Figure 3. Meter Dimensions - Top View.......................................................... 12
Figure 4: Transmitter Supply Voltage Selection............................................ 14
Figure 5. APM-100 & APM-200 Connectors Label.......................................... 14
Figure 6. APM-120 & APM-220 Connectors Label.......................................... 14
Figure 7. APM-101 & APM-201 Connectors Label.......................................... 14
Figure 8. APM-140 & APM-240 Connectors Label.......................................... 14
Figure 9. APM-121 & APM-221 Connectors Label.......................................... 14
Figure 10. APM-141 & APM-241 Connectors Label........................................ 14
Figure 11: Power Connections ........................................................................ 15
Figure 12: Transmitter Powered by Internal Supply...................................... 15
Figure 13: Transmitter Powered by External Supply or Self-Powered ........ 15
Figure 14: Voltage Input Connections ............................................................ 15
Figure 15: Relay Connections ......................................................................... 15
Figure 16: AC and DC Loads Protection ........................................................ 16
Figure 17: Low Voltage DC Loads Protection................................................ 16
Figure 18: F4 Digital Input Connections......................................................... 16
Figure 19: 4-20 mA Output Connections ........................................................ 16
Figure 20. Analog Output Supply Powering Other Devices.......................... 16
Figure 21. Expansion Module & DIN Rail Mounting Kit................................. 17
Figure 22. External Relays Module Connections........................................... 17
Figure 23. Digital I/O Module Connections..................................................... 17
Figure 24. Interlock Connection...................................................................... 17

Series APM Analog Panel Meter Instruction Manual
6
Introduction
Front, back and in between, the APM meter boasts
specifications, features and functionality that make it
the only 1/8 DIN analog input flow rate/totalizer you
will ever need. The number one feature that makes
the APM such a useful device is its built-in 24 VDC @
200 mA power supply to drive the transmitter. This
feature not only saves the cost of an external power
supply, but also greatly simplifies wiring. In addition,
there is a second 24 VDC @ 40 mA power supply
provided with the 4-20 mA output option.
The second most important feature about these
meters is they can display flow rate and total at the
same time. In fact, the 6-digit dual line display can be
programmed for a wide variety of flow applications,
including: flow rate and tag, total and tag, total and
grand total, and even non-resettable grand total.
Another reason why the APM Meter is the only flow
rate/totalizer you will ever need is its NEMA 4X rated
front panel. This means you can install the APM in
panels exposed to moisture, dust and other adverse
conditions.
Other key features include four relays and 4-20 mA
output option, remote total reset, advanced input
signal conditioning like square root extraction and
programmable exponent for open channel flow.
Finally, all these features and capabilities can easily
be programmed with free Panel Meter Pro software.
Using the APM Like an MPM
Process Meter
The APM is essentially a MPM process meter with
flow totalization capability. The flow totalization
capability can easily be de-activated for customers
that would prefer their APM behave like a MPM
process meter. For instructions on how to do this, see
Setting Up the Rate/Totalizer Meter (setup) on page
21 for details.
Ordering Information
Standard Models
85-265 VAC
Model
12-24 VDC
Model
Options Installed
APM-100
APM-200
No options
APM-101
APM-201
4-20 mA output
APM-120
APM-220
2 relays
APM-121
APM-221
2 relays & 4-20 mA output
APM-140
APM-240
4 relays
APM-141
APM-241
4 relays & 4-20 mA output
Accessories
Model
Description
PMA-01
RS-232 serial adapter
PMA-02
USB serial adapter
PMA-03
RS-422/485 serial adapter
PMA-04
RS-232 to RS-422/485 isolated converter
PMA-05
RS-232 to RS-422/485 non-isolated
converter
PMA-06
USB to RS-232 non-isolated converter
PMA-07
USB to RS-422/485 isolated converter
PMA-08
USB to RS-422/485 non-isolated
converter
PMA-09
Suppressor (snubber): 0.01 μF/470 Ω,
250 VAC
PMA-10
DIN rail mounting kit for two expansion
modules
PMA-11
4 SPST (Form A) relays
PMA-12
4 digital inputs & 4 digital outputs
(2 may be connected)
Enclosures
Series
Meters
Material
PME-10
1-10
Plastic NEMA 4X
PME-20
1-6
Plastic NEMA 4X
PME-30
1-6
Stainless Steel NEMA 4X
PME-40
1-6
Painted Steel NEMA 4
PME-00
1-2
Plastic NEMA 4X

Series APM Analog Panel Meter Instruction Manual
7
Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Display Line 1: 0.6" (15 mm) high, red LEDs
Line 2: 0.46" (12 mm) high, red LEDs
6 digits: each (-
99999 to 999999), with lead
zero blanking.
Display
Intensity
Eight user selectable intensity levels.
Default value is six.
Display
Update Rate
5/second (200 ms)
Overrange
Display flashes 999999
Underrange Display flashes -99999
Display
Assignment
Display lines 1 & 2 may be assigned to
rate, total, grand total, alternate (rate/total,
rate/grand total, rate/units, total/units, and
grand total/units), set points, max/min,
units
(line 2 only), and Modbus input. Additional
displays are available if parameter total
is
off, and parameter d-SCAL is on: gross,
alternating gross/net, PV1, PV2, and PCT
(refer to the APM Analog Panel Meter
instruction manual at www.dwyer-inst.com).
Programming
Methods
Four front panel buttons, digital inputs, or
PC with Panel Meter Pro software.
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.
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
85-265 VAC 50/60 Hz; 90-265 VDC, 20 W max;
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
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 65°C (-40 to 149°F)
Storage temperature range:
-40 to 85°C (-40 to 185°F)
Relative humidity:
0 to 90% non-condensing
Connections Removable screw terminal blocks accept
12 to 22 AWG wire, RJ45 for external
relays, digital I/O, and serial communication
adapters.
Enclosure 1/8 DIN, high impact plastic, UL 94V-0,
color: black
Front Panel
NEMA 4X, IP65
Mounting 1/8 DIN panel cutout required:
3.622" x 1.772" (92 mm x 45 mm)
Two panel mounting bracket assemblies
are provided.
Tightening
Torque
Screw terminal connectors: 5 lb-in
(0.56 Nm)
Overall
Dimensions
4.68" x 2.45" x 5.64"
(119 mm x 62 mm x 143 mm)
(W x H x D)
Weight
9.5 oz (269 g)
Warranty 3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.dwyer-inst.com for complete details.

Series APM Analog Panel Meter Instruction Manual
8
Process Input
Inputs
Field selectable: 0-20 mA, 4-20 mA
±10 V (0-5 V, 1-5 V, 0-10 V)
Modbus PV (Slave)
Isolated
Transmitter
Power Supply
Terminals P+ & P-: 24 VDC ±10%.
All models selectable for 24, 10, or 5 VDC
supply (internal jumper J4). 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 Figure 4: Transmitter Supply Voltage
Selection on page 14 and
Figure 19: 4-20 mA Output Connections on
page 16.
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 65°C ambient, 0.01% of calibrated
span/
°
C max from -40 to 0
°
C ambient
Input Signal
Conditioning
Linear, square root, programmable
exponent, or round horizontal tank volume
calculation
Multi-Point
Linearization
2 to 32 points
Programmable
Exponent
User selectable from 1.0001 to 2.9999 for
open channel flow
Round
Horizontal
Tank
Diameter & Length: 999.999 inch or cm
calculates volume in gallons or liters
respectively.
Low-Flow
Cutoff
0.0 to 999,999.9 (0 disables cutoff
function). Point below at which 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
Range
Input Range
Minimum Span
Input 1 & Input 2
4-20 mA
0.15 mA
±
10 V
0.10 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 kΩ
Current ranges: 50 - 100 Ω(depending on
resettable fuse impedance)
Input
Overload
Current input protected by resettable fuse,
30 VDC max. Fuse resets automatically
after fault is removed.
HART
Transparency
The meter does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The meter is not
affected if a HART communicator is
connected to the loop. The meter does not
display secondary HART variables.
Rate/Totalizer
Rate Display
Indication
-99999 to 999999, lead zero blanking.
“R” LED illuminates while displaying rate.
Total Display
& Total
Overflow
0 to 999,999; automatic lead zero blanking.
“T” LED is illuminated while displaying total
or grand total.
Up to 999,999,999 with total-overflow
feature. “oF” is displayed to the left of total
overflow and ▲ LED is illuminated.
Total
Decimal Point
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.
Totalizer
Calculates total 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.
Totalizer
Rollover
Totalizer rolls over when display exceeds
999,999,999. Relay status reflects display.
Total
Overflow
Override
Program total reset for automatic with
0.1 second delay and set point 1 for
999,999
Totalizer
Presets
Up to eight, user selectable under setup
menu. Any set point can be assigned to
total and may be programmed anywhere in
the range of the meter for total alarm
indication.
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.
Total Reset
User selectable via front panel button, F4
terminal at back of meter, external contact
closure on digital inputs, automatically via
user selectable preset value and time
delay, or through serial communications.
Total Reset
Password
Total and grand total passwords may be
entered to prevent resetting the total or
grand total from the front panel.
Non-Resettable
Total
The grand total can be programmed as a
non-resettable total by entering the
password “050873”.
•Once the Grand Total has been programmed as
“non-resettable” the feature CANNOT be
disabled.

Series APM Analog Panel Meter Instruction Manual
9
Relays
Rating 2 or 4 SPDT (Form C) internal and/or
4 SPST (Form A) external; 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 16 for details.
Relay
Assignment
Relays may be assigned to rate, total, or
grand total.
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 (2-8 relays)
•Sampling (based on set point and time)
•Off (disable unused relays and enable
Interlock feature)
•Manual on/off control mode
Relay Reset User selectable via front panel button, F4
terminal at back of meter, external contact
closure on digital inputs, automatically via
user selectable preset value and time
delay, or through serial communications.
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.
Additional
Relays
An external module, model PMA-11, is
available to add 4 SPST 3 A relays to the
meter.
Isolated 4-20 mA Transmitter
Output
Output Source Rate/process, total, grand total, max, min,
set points 1-8, 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% FS ± 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
Terminals I+ & R: 24 VDC ±10%. May be
used to power the 4-20 mA output or other
devices.
All models rated @ 40 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply Minimum Maximum
24 VDC 10 Ω700 Ω
35 VDC
(external)
100 Ω1200 Ω
Additional
4-20 mA
Outputs
The PD659-1MA-2MA
can split the optional
4-20 mA output into two isolated 4-20 mA
outputs
0-10 VDC
Output
The PD659-1MA-1V can convert the
optional 4-20 mA output to a 0-10 VDC
output

Series APM Analog Panel Meter Instruction Manual
10
USB Connection
Function Programming only
Compatibility USB 2.0 Standard, Compliant
Connector
Type
Micro-B receptacle
Cable
USB A Male to Micro-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.
On-Board Digital Input (F4)
Function Reset total, remote operation of front-panel
buttons, acknowledge/reset relays, reset
max/min values. See Function Keys &
Digital I/O Available Settings on page 39
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
Additional I/O Up to 2 external modules, model PMA-12
with 4 digital inputs and 4 digital outputs
each can be added.
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 APM Modbus Register Tables located at
www.dwyer-inst.com for details.
Panel Meter Pro
System
Requirements
Microsoft
®
Windows
®
XP/Vista/7/8/10
Communications
USB 2.0 (for programming only)
(Standard USB A to Micro USB B)
RS-232 adapter, RS-485 adapter and
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.