DWYER INSTRUMENTS, INC. Series APM Analog Panel Meter Instruction Manual

100 Pages·2012·2.05 MB·English

Bulletin: L-APM
Series APM Analog Panel Meter
Instruction Manual

• 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
DWYER INSTRUMENTS, INC.
Phone: [phone] dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: [phone] e-mail: [email protected]
Series APM Analog Panel Meter Instruction Manual

Disclaimer FREE Panel Meter Pro
The information contained in this document is
subject to change without notice. Dwyer Programming Software
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. The meter can be powered from the Micro USB connection.
When using the Micro USB connection, DO NOT apply AC or DC
Anyone using this product for such applications
power to the meter.
does so at his/her own risk. Dwyer Instruments,
Inc. shall not be held liable for damages resulting
The easiest and quickest way to program your MPM
from such improper use. 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
WARNING PC with a USB cable. We recommend that the first
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
thing you do after taking the meter out of the box is

connect the MPM to your PC with the provided USB
Limited Warranty cable – do not use a different cable. DO NOT apply
Dwyer Instruments, Inc. warrants this product AC or DC power to the meter while your PC is
against defects in material or workmanship for connected to the meter as it will disrupt the USB
the specified period under “Specifications” from connection. You don’t even have to apply an input
the date of shipment from the factory. Dwyer signal.
Instruments’ liability under this limited warranty
shall not exceed the purchase value, repair, or Panel Meter Pro programming software is intuitive,
replacement of the defective unit. See Warranty and most customers can get their meter programmed
Information and Terms & Conditions on as they like without even looking in the manual.
www.dwyer-inst.com for complete details. In addition to programming, the software may be used
for:
Registered Trademarks
• Monitoring
All trademarks mentioned in this document are
• Datalogging using your PC
the property of their respective owners.
• Generating and saving programming files for

later use
© 2020 Dwyer Instruments, Inc.
All rights reserved. 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.

2
Series APM Analog Panel Meter Instruction Manual

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

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Series APM Analog Panel Meter Instruction Manual

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

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Series APM Analog Panel Meter Instruction Manual

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

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Series APM Analog Panel Meter Instruction Manual

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

Specifications Isolation 4 kV input/output-to-power line
500 V input-to-output or output-to-P+ supply
Except where noted all specifications apply to
Overvoltage Installation Overvoltage Category II:
operation at +25°C. Category Local level with smaller transient
overvoltages than Installation Overvoltage
General Category III.
Environmental Operating temperature range:
Display Line 1: 0.6" (15 mm) high, red LEDs -40 to 65°C (-40 to 149°F)
Line 2: 0.46" (12 mm) high, red LEDs Storage temperature range:
6 digits: each (-99999 to 999999), with lead -40 to 85°C (-40 to 185°F)
zero blanking. Relative humidity:
Display Eight user selectable intensity levels. 0 to 90% non-condensing
Intensity Default value is six.
Connections Removable screw terminal blocks accept
Display 5/second (200 ms) 12 to 22 AWG wire, RJ45 for external
Update Rate relays, digital I/O, and serial communication
Overrange Display flashes 999999 adapters.
Underrange Display flashes -99999 Enclosure 1/8 DIN, high impact plastic, UL 94V-0,
color: black
Display Display lines 1 & 2 may be assigned to
Front Panel NEMA 4X, IP65
Assignment rate, total, grand total, alternate (rate/total,
rate/grand total, rate/units, total/units, and Mounting 1/8 DIN panel cutout required:
grand total/units), set points, max/min, units 3.622" x 1.772" (92 mm x 45 mm)
(line 2 only), and Modbus input. Additional Two panel mounting bracket assemblies
displays are available if parameter total is are provided.
off, and parameter d-SCAL is on: gross,
Tightening Screw terminal connectors: 5 lb-in
alternating gross/net, PV1, PV2, and PCT
Torque (0.56 Nm)
(refer to the APM Analog Panel Meter
instruction manual at www.dwyer-inst.com). Overall 4.68" x 2.45" x 5.64"
Programming Four front panel buttons, digital inputs, or Dimensions (119 mm x 62 mm x 143 mm)
Methods PC with Panel Meter Pro software. (W x H x D)
Noise Filter Programmable from 2 to 199 Weight 9.5 oz (269 g)
(0 will disable filter) Warranty 3 years parts & labor. See Warranty
Filter Bypass Programmable from 0.1 to 99.9% of Information and Terms & Conditions on
calibrated span www.dwyer-inst.com for complete details.

Recalibration All ranges are calibrated at the factory.
Recalibration is recommended at least
every 12 months.
Max/Min Max/min readings reached by the process
Display 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 All programmed settings are stored in
Memory non-volatile memory for a minimum of ten
years if power is lost.
Power 85-265 VAC 50/60 Hz; 90-265 VDC, 20 W max;
Options 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 Greater than 60 dB at 50/60 Hz
Rejection
7
Series APM Analog Panel Meter Instruction Manual

Process Input Total Display 0 to 999,999; automatic lead zero blanking.
& Total “T” LED is illuminated while displaying total
Inputs Field selectable: 0-20 mA, 4-20 mA Overflow or grand total.
±10 V (0-5 V, 1-5 V, 0-10 V) Up to 999,999,999 with total-overflow
feature. “oF” is displayed to the left of total
Modbus PV (Slave)
overflow and ▲ LED is illuminated.
Isolated Terminals P+ & P-: 24 VDC ±10%.
Transmitter Total Up to five decimal places or none:
Power Supply All models selectable for 24, 10, or 5 VDC Decimal Point d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
supply (internal jumper J4). 85-265 VAC Total decimal point is independent of rate
models rated @ 200 mA max, 12-24 VDC decimal point.
powered models rated @ 100 mA max.
Totalizer Calculates total based on rate and field
5 & 10 VDC supply rated @ 50 mA max.
programmable multiplier to display total in
Refer to Figure 4: Transmitter Supply Voltage
engineering units. Time base must be
Selection on page 14 and
selected according to the time units in
Figure 19: 4-20 mA Output Connections on
which the rate is displayed.
page 16.
Totalizer Totalizer rolls over when display exceeds
Accuracy ±0.03% of calibrated span ±1 count,
Rollover 999,999,999. Relay status reflects display.
square root & programmable exponent
accuracy range: 10-100% of calibrated Total Program total reset for automatic with
span Overflow 0.1 second delay and set point 1 for
Override 999,999
Temperature 0.005% of calibrated span/°C max from
Drift 0 to 65°C ambient, 0.01% of calibrated Totalizer Up to eight, user selectable under setup
span/°C max from -40 to 0°C ambient Presets menu. Any set point can be assigned to
total and may be programmed anywhere in
Input Signal Linear, square root, programmable the range of the meter for total alarm
Conditioning exponent, or round horizontal tank volume indication.
calculation
Programmable 0.1 and 999.9 seconds; applied to the first
Multi-Point 2 to 32 points Delay relay assigned to total or grand total.
Linearization
On Release If the meter is programmed to reset total to
Programmable User selectable from 1.0001 to 2.9999 for zero automatically when the preset is
Exponent open channel flow reached, then a delay will occur before the
Round Diameter & Length: 999.999 inch or cm total is reset.
Horizontal calculates volume in gallons or liters Total Reset User selectable via front panel button, F4
Tank respectively. terminal at back of meter, external contact
Low-Flow 0.0 to 999,999.9 (0 disables cutoff closure on digital inputs, automatically via
Cutoff function). Point below at which display user selectable preset value and time
always shows zero. delay, or through serial communications.
Decimal Point Up to five decimal places or none: Total Reset Total and grand total passwords may be
d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd Password entered to prevent resetting the total or
grand total from the front panel.
Calibration Input Range Minimum Span
Range Input 1 & Input 2 Non-Resettable The grand total can be programmed as a
4-20 mA 0.15 mA Total non-resettable total by entering the
password “050873”.
±10 V 0.10 V
An error message will appear if the input 1
and input 2 signals are too close together. • Once the Grand Total has been programmed as
Input Voltage ranges: greater than 500 kΩ “non-resettable” the feature CANNOT be
Impedance Current ranges: 50 - 100 Ω (depending on disabled.
resettable fuse impedance)
Input Current input protected by resettable fuse,
Overload 30 VDC max. Fuse resets automatically
after fault is removed.
HART The meter does not interfere with existing
Transparency 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 -99999 to 999999, lead zero blanking.
Indication “R” LED illuminates while displaying rate.
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Series APM Analog Panel Meter Instruction Manual

Relays Isolated 4-20 mA Transmitter
Output
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; Output Source Rate/process, total, grand total, max, min,
1/14 HP (≈ 50 W) @ 125/250 VAC for set points 1-8, or manual control mode
inductive loads Scaling Range 1.000 to 23.000 mA for any display range.
Noise Noise suppression is recommended for Calibration Factory calibrated:
Suppression each relay contact switching inductive 4.000 to 20.000 = 4-20 mA output
loads. See Switching Inductive Loads on
page 16 for details. Analog Out 23.000 mA maximum for all parameters:
Programming Overrange, underrange, max, min, and
Relay Relays may be assigned to rate, total, or break
Assignment grand total.
Accuracy ± 0.1% FS ± 0.004 mA
Deadband 0-100% of span, user programmable
Temperature 0.4 µA/°C max from 0 to 65°C ambient,
High or Low User may program any alarm for high or Drift 0.8 µA/°C max from -40 to 0°C ambient
Alarm low trip point. Unused alarm LEDs and Note: Analog output drift is separate from
relays may be disabled (turn off). input drift.
Relay • Automatic (non-latching) and/or Isolated Terminals I+ & R: 24 VDC ±10%. May be
Operation manual reset Transmitter used to power the 4-20 mA output or other
• Latching (requires manual
Power Supply devices.
acknowledge) with or without clear
• Pump alternation control (2-8 relays) All models rated @ 40 mA max.
• Sampling (based on set point and time) External Loop 35 VDC maximum
• Off (disable unused relays and enable Power Supply
Interlock feature)
Output Loop Power supply Minimum Maximum
• Manual on/off control mode
Resistance
Relay Reset User selectable via front panel button, F4 24 VDC 10 Ω 700 Ω
terminal at back of meter, external contact 35 VDC 100 Ω 1200 Ω
closure on digital inputs, automatically via (external)
user selectable preset value and time
delay, or through serial communications. Additional The PD659-1MA-2MA can split the optional
4-20 mA 4-20 mA output into two isolated 4-20 mA
Time Delay 0 to 999.9 seconds, on & off relay time Outputs outputs
delays. Programmable and independent for
each relay. 0-10 VDC The PD659-1MA-1V can convert the
Output optional 4-20 mA output to a 0-10 VDC
Fail-Safe Programmable and independent for each output
Operation relay.

Note: Relay coil is energized in non-alarm
condition. In case of power failure, relay
will go to alarm state.
Auto When power is applied to the meter, relays
Initialization will reflect the state of the input to the
meter.
Additional An external module, model PMA-11, is
Relays available to add 4 SPST 3 A relays to the
meter.

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Series APM Analog Panel Meter Instruction Manual

USB Connection Modbus® RTU Serial
Communications
Function Programming only
Compatibility USB 2.0 Standard, Compliant Slave Id 1 – 247 (Meter address)
Connector Micro-B receptacle
Baud Rate 300 - 19,200 bps
Type
Transmit Programmable between 0 and 199 ms
Cable USB A Male to Micro-B Cable Time Delay
Driver Microsoft® Windows® XP/Vista/7/8/10 Data 8 bit (1 start bit, 1 or 2 stop bits)
Power USB port provides power to the meter. Parity Even, Odd, or None with 1 or 2 stop bits
DO NOT apply AC or DC power to the
meter while the USB port is in use. Byte-To-Byte 0.01 – 2.54 second
Timeout
Turn Around Less than 2 ms (fixed)
On-Board Digital Input (F4)
Delay
Note: Refer to the APM Modbus Register Tables located at
Function Reset total, remote operation of front-panel
buttons, acknowledge/reset relays, reset www.dwyer-inst.com for details.
max/min values. See Function Keys &
Digital I/O Available Settings on page 39 for
Panel Meter Pro
a complete list of capabilities.
Contacts 3.3 VDC on contact. Connect normally System Microsoft® Windows® XP/Vista/7/8/10
open contacts across F4 to COM Requirements
Logic Levels Logic High: 3 to 5 VDC Communications USB 2.0 (for programming only)
(Standard USB A to Micro USB B)
Logic Low: 0 to 1.25 VDC
RS-232 adapter, RS-485 adapter and
Additional I/O Up to 2 external modules, model PMA-12
RS-485 to USB converter
with 4 digital inputs and 4 digital outputs
(programming, monitoring, and data
each can be added.
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.

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