ELKOR WattsOn-Mark II User manual

PRECISION ENERGY METER
METER USER MANUAL

ELKOR TECHNOLOGIES INC. - Page 2 - WattsOn-Mark II –USER MANUAL

ELKOR TECHNOLOGIES INC. - Page 3 - WattsOn-Mark II –USER MANUAL
Installation Considerations
Installation and maintenance of the WattsOn device must only be performed by qualified, competent
personnel who have appropriate training and experience with electrical high voltage and current
installations. The WattsOn device must be installed in accordance with all Local and National Electrical
Safety Codes.
WARNING
Failure to observe the following may result in severe injury or death:
During normal operation of this device, hazardous voltages are present on the input terminals of the device and
throughout the connected power lines, including any potential transformers (PTs). With their primary circuit
energized, current transformers (CTs) may generate high voltage when their secondary windings are open.
Follow standard safety precautions while performing any installation or service work (i.e. remove line fuses, short
CT secondaries, etc).
This device is not intended for protection applications.
Do not HIPOT and/or dielectric test any of the digital outputs. Refer to this manual for the maximum voltage level
the meter can withstand.
Do not exceed rated input signals as it may permanently damage the device.
The power supply input should be connected via a rated 12-35 VDC / 24VAC power supply and properly isolated
from the line voltage.
Danger
Line voltages up to 600 VRMS may be present on the input terminals of the device and throughout the
connected line circuits during normal operation. These voltages may cause severe injury or death.
Installation and servicing must be performed only by qualified, properly trained personnel.
Limitation of Liability
Elkor Technologies Inc. (“Elkor”) reserves the right to make changes to its products and/or their specifications without
notice. Elkor strongly recommends obtaining the latest version of the device specifications to assure the most current
information is available to the customer. Specifications and manual are available at http://www.elkor.net
Elkor assumes no liability for applications assistance, customer’s system design, or infringement of patents or copyrights
of third parties by/or arising from the use of Elkor’s devices.
ELKOR TECHNOLOGIES INC. SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES SUSTAINED IN CONNECTION
WITH ELKOR PRODUCTS, EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW. FURTHERMORE, ELKOR NEITHER
ALLOWS NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY SUCH OBLIGATION OR LIABILITY.
Although the information contained in this document is believed to be accurate, Elkor assumes no responsibility for any
errors which may exist in this publication.

ELKOR TECHNOLOGIES INC. - Page 4 - WattsOn-Mark II –USER MANUAL
TABLE OF CONTENTS
Installation Considerations........................................................................................................................................3
WARNING................................................................................................................................................................3
Limitation of Liability ................................................................................................................................................3
Table of Contents.............................................................................................................................................. 4
1. Introduction .............................................................................................................................................. 5
1.1. Electrical Wiring ................................................................................................................................................5
1.2. Disclosure .........................................................................................................................................................5
1.3. Revision History ................................................................................................................................................5
1.4. Warranty ..........................................................................................................................................................5
1.5. Product Description ...........................................................................................................................................5
2. Specifications ............................................................................................................................................ 6
2.1. Indicators .........................................................................................................................................................7
3. Installation................................................................................................................................................ 8
3.1. Grounding Considerations ..................................................................................................................................8
3.2. Power Supply ....................................................................................................................................................8
3.3. Line Circuits Wiring............................................................................................................................................8
3.4. Fusing of Voltage Sensing Inputs .......................................................................................................................8
3.5. Enclosure Mounting ...........................................................................................................................................8
3.6. Commissioning Flowchart ..................................................................................................................................9
3.7. Digital Communications ...................................................................................................................................10
4. Communication ....................................................................................................................................... 11
4.1. Modbus Protocol .............................................................................................................................................11
4.2. Modbus Functions ...........................................................................................................................................11
5. Register Map ........................................................................................................................................... 13
5.1. Register Addressing Conventions......................................................................................................................13
5.2. Register Size ...................................................................................................................................................13
5.3. Data Types .....................................................................................................................................................13
5.4. Instantaneous Data Registers ..........................................................................................................................14
5.5. Accumulated Data Registers.............................................................................................................................15
5.6. Configuration and Status Registers ...................................................................................................................21
5.7. System Registers.............................................................................................................................................28
5.8. Relay Output Configuration Registers ...............................................................................................................31
6. Customizing the Register Map ................................................................................................................ 33
7. Firmware Updates and the Bootloader ................................................................................................... 35
8. Appendix A, Wiring Diagrams ................................................................................................................. 36
8.1. Four-Wire (Wye) Wiring Diagram .....................................................................................................................36
8.2. Three-Wire (Delta) Wiring Diagram (Three CTs)................................................................................................37
8.3. Three-Wire (Delta) Wiring Diagram (Two CTs) ..................................................................................................38
8.4. Split-Phase Wiring Diagram..............................................................................................................................39
8.5. CT Wiring Notes ..............................................................................................................................................40
9. Appendix B, Modbus Protocol Details ..................................................................................................... 41
9.1. Modbus Frames...............................................................................................................................................41
9.2. Cyclic Redundancy Checksum ..........................................................................................................................41
9.3. Read Holding Registers....................................................................................................................................42
9.4. Read Input Registers .......................................................................................................................................42
9.5. Write Single Register .......................................................................................................................................42
9.6. Write Multiple Registers ...................................................................................................................................42
9.7. Mask Write Register ........................................................................................................................................43
9.8. Read/Write Multiple Registers ..........................................................................................................................43
9.9. Diagnostic Functions........................................................................................................................................44
9.10. Get Comm Event Counter...............................................................................................................................46
9.11. Report Slave ID .............................................................................................................................................46

ELKOR TECHNOLOGIES INC. - Page 5 - WattsOn-Mark II –USER MANUAL
1. INTRODUCTION
1.1. Electrical Wiring
Because of possible electrical shock or fire hazards, connection of this equipment should only be made by
qualified personnel in compliance with the applicable electrical codes and standards.
1.2. Disclosure
This publication contains information proprietary to Elkor Technologies Inc. No part of this publication may be reproduced,
in any form, without prior written consent from Elkor Technologies Inc.
1.3. Revision History
Version
Date
Changes
Revision 1
October 2014
Original Version
Revision 2
December 2014
Clarified reserved registers in tables from section 5.4.1 through to 5.5.4.
Corrected default threshold voltage in section 2.1 from 5V to 20V.
Corrected frequency channel selection in section 5.6.15 to state that changes occur on voltages below 5V
Revision 3
February 2015
Corrected description of Report Slave ID in Appendix B to include the byte count
Revision 4
September 2015
Added Total Capacitive/Reactive Energy (FW > v10.52)
1.4. Warranty
The WattsOn-Mark II is warranted against defective material and workmanship. During the warranty period Elkor will
repair or replace, at its option, all defective equipment that is returned freight prepaid. There will be no charge for repair
provided there is no evidence that the equipment has been mishandled or abused. If the equipment is found to be in
proper working order, a service fee will be billed to the customer. Warranty claims must be made via the original
purchaser.
Standard Warranty duration is one (1) year from date of sale. Extended warranties are available to OEMs.
1.5. Product Description
The WattsOn-Mark II Precision Energy Meter utilizes advanced metering technology to implement a multi-functional
power and energy meter into a small, cost-effective package. WattsOn-Mark II incorporates three meters into one to
provide a unique solution for monitoring up to single phase, split phase and three phase loads.
The meter provides comprehensive per phase data, as well as cumulative data, including Volts, Amps, Real Power,
Reactive Power, Apparent Power, Voltage Angle, Power Factor and Frequency, Quadrant, Import/Export/Net Wh/VAh and
per Quadrant VARh.
WattsOn-Mark II features full four-quadrant metering, and all parameters are metered and accumulated on a per-phase
basis. Additionally, the meter may be configured with per-phase CT ratios allowing for metering asymmetrical loads such
as individual building branch circuits. Therefore, it is possible to use different CT sizes and ratios on each input.
The unit accepts up to 600V (line-to-line) directly without needing potential transformers. It may be configured for use
with 333mV output CTs, mA output CTs (such as Elkor’s "safe" mA split and solid core CTs) or industry standard 5A CTs.
The WattsOn-Mark II meter features a proven high performance metering architecture, which allows for accurate and
extremely high resolution measurements over a very wide dynamic range input. The data is updated up to two times per
second. The true-RMS inputs may be used even with distorted waveforms such as those generated by variable frequency
drives and SCR loads.
Information is available via the RS-485 (Modbus RTU) output port. In addition, two solid-state relay outputs are available
and may be software configured for Wh pulse outputs, or alarm triggers, as well as direction of power. An on-board
graphic LCD display, real-time clock and data logging is optionally available.

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2. SPECIFICATIONS
Inputs
Control Power Input Rating
12-35V VDC / 24VAC, 100 mA max
System Types Supported
120/208V Delta, Wye
277/480V Delta, Wye
347/600V Delta, Wye
Single-phase installations up to 347V RMS
Split-phase (two phase) installations
Frequency
40-70 Hz
Voltage Input Rating
5 to 347V L-N (600 V L-L)
Voltage Continued Overload Rating
20%
Voltage Absolute Maximum Rating
450V L-N, 780V L-L
Voltage Input Impedance
1.5MΩ (line-to-neutral) minimum, 3.0MΩ (line-to-line) minimum
Voltage Wire Size
AWG 30-12, solid / stranded (AWG 16-22 recommended)
Current Input Rating
Up to 200 mA RMS (–mA model)
Up to 333 mV RMS (–mV model)
Up to 10A RMS (–5A model)
Current Continued Overload Rating
+20%
Current Absolute Maximum Rating
400 mA RMS (–mA model)
666 mV RMS (–mV model)
20A RMS (–5A model)
Current Burden/Input Impedance
1.5Ω total maximum(–mA model)
800kΩminimum, 1.2MΩ typical (–mV model)
0.05Ωtotal maximum (–5A model)
Current Wire Size
AWG 24-12, solid / stranded (AWG12-16 recommended for 5A CTs)
Tightening Torque
7.0 Lb-In (Voltage), 4.4 Lb-In (Other)
Outputs
Serial
RS-485 2-wire Modbus RTU, 9600 (default) to 230400 baud
Elkor Expansion Bus Port
Relay
2x Solid-State Relay Outputs (100 mA @ 50V max)
Indicators
LEDs for: Status, Voltage, Current, Relay State, Communication
Display
Back-lit Graphic LCD Display 128x32 (–DL models only)
Accuracy
Current (A)
0.05% typical
0.1% max
Voltage, Line-to-Neutral (V)
0.1% typical
0.2% max
Voltage, Line-to-Line (V)
0.2% typical
0.3% max
Real Power (W)
0.1% typical
0.2% max
Apparent Power (VA)
0.1% typical
0.2% max
Reactive Power (VAR)
0.1% typical
0.2% max
Energy
0.1% typical
0.2% max
Power Factor
0.2% max
Frequency
0.01% max
Sampling Rate
2 KHz
Data Update Time
2 Hz
Environmental
Operating Temperature
–40°C to +70°C
Storage Temperature
–65°C to +85°C
Humidity
10 to 90% non-condensing
Mechanical
Mass
0.15 kg (–mA and –mV models) - 0.23 kg (–5A-DL model)
Mounting
DIN Rail mounting
2-point screw mounting
Regulatory
Electromagnetic Emissions
FCC part 15 Class B (residential and industrial)
Safety
UL 508 listed
Accuracy
ANSI C12.20 Class 0.2

ELKOR TECHNOLOGIES INC. - Page 7 - WattsOn-Mark II –USER MANUAL
2.1. Indicators
A number of indicator LEDs are present on the WattsOn. They are described in the table below.
Label
Color
Description
STATUS
Green/Red
Indicates the status of the device. See the Status Indicator Codes, below.
MB
Green/Red
Indicates Modbus RS-485 communication. Green indicates transmission, red indicates reception.
Solid red indicates that Modbus is wired backwards (+ and –terminals are reversed).
XB
Green/Red
Indicates Elkor Expansion Bus communication. Green indicates transmission, red indicates reception.
Solid red indicates that the Expansion bus is wired backwards (+ and –terminals are reversed).
K1
Yellow
Indicates the state of the first relay output. Off indicates open, on indicates closed.
K2
Yellow
Indicates the state of the second relay output. Off indicates open, on indicates closed.
V
3x Green
Voltage indicators. By default, the LED is on when the voltage is greater than 20V.
I
3x Green/Red
Current & Power Indicators. See Current & Power Indicators, below.
2.1.1. Status Indicator Codes
The status indicator uses a variety of patterns to indicate the device’s status, as described by the following table.
Code
Description
Solid green indicates that the device is operating normally.
Two periodic green blinks indicates that the meter has started in bootloader mode. See
section 7, Firmware Updates and the Bootloader (p. 35) for details.
Alternating green and red indicates that the Modbus address is set to 0, which is used
for debugging purposes. See section 5.7.2, Configuring Serial Parameters (p. 28)
for details on using address 0.
Two periodic red blinks indicates that corrupt firmware has been on the device, halting
the device in bootloader mode.
Flashing red indicates a product malfunction that prevents it from reading correctly.
2.1.2. Current & Power Indicators
The WattsOn features three indicator LEDs which display the status of the metering inputs. The table below summarizes
the LED states. The LED will not turn on (in any state) if the input current is less than 0.1% (default) of the full scale
input.
Code
Description
Solid green indicates that current is present.
If voltage is present, solid green indicates that active power (kW) is being imported .
Blinking green indicates that power is being exported . (Voltage must be present).
Solid red indicates that active power (kW) is being imported , but absolute reactive
power (kVAR) exceeds absolute active power (kW). (Voltage must be present).
Blinking red indicates that active power is being exported , but absolute reactive power
(kVAR) exceeds absolute active power (kW). (Voltage must be present).
By default, the LED is off when the current is less than 0.1% of the full scale input.

ELKOR TECHNOLOGIES INC. - Page 8 - WattsOn-Mark II –USER MANUAL
3. INSTALLATION
3.1. Grounding Considerations
Output signal ground is usually provided by the controller (RTU, DDC, PLC etc). The output common (GND) IS
ISOLATED (3500VAC minimum) from the input reference (N terminal), however the "-" terminal of the input power
supply and the output common (GND) are tied together internally.
3.2. Power Supply
The power supply must be properly isolated from the measurement line to maintain the required isolation voltage. A small
dedicated transformer or DIN mount switching power supply is recommended to ensure the best isolation between
system components. Contact Elkor to purchase recommended accessories.
For DC power supplies, the polarity must be observed. For AC power supplies, it must be noted that the RS-485 output
common (G) and “-” power supply terminal are tied together. Care must be taken if multiple devices are powered using
one AC supply to prevent shorting the supply.
The power supply may be shared by multiple devices.
3.3. Line Circuits Wiring
The WattsOn meter is a true 'three element' meter that can be used in any electrical system. For four-wire systems
('wye', with distributed neutral) the meter requires current and voltage information from each phase, therefore three
current transformers (CTs) and three line voltages plus neutral must be wired to the unit.
WattsOn may be used in three wire systems ('delta', without a distributed neutral) as a 'three element' meter (three CTs
required). The 5A meter version may be wired as a 'two element' meter utilizing only two CTs (and two PTs). When no
neutral is present, the neutral connection should be omitted.
Standard wiring principles for electricity meters apply to the WattsOn meter, as for any other '3 element' electricity meter.
The polarity of interfacing transformers must be observed. The left terminal of each current input connector is always
associated with the 'X1' wire of the responding CT. Please refer to Appendix A for details on CT wiring.
All mV and mA CTs must be wired independently to the corresponding current inputs (two wires from each CT without
shunts or jumpers). mA and mV CTs must NOT be grounded, or interconnected with each other (or any other
components) in any way.
The use of a metering test switch containing fuses for voltage lines and shorting terminals for 5A CTs is recommended. A
pre-assembled Elkor i-BlockTM may be used as a convenient and economical solution.
A CT shorting mechanism is not required for mV and Elkor mA style CTs, since these are voltage clamped, however
appropriate protection (fuse or breaker) for input line voltages is required.
See Section 8, Appendix A, Wiring Diagrams (p. 36) for details on wiring the meter for various system configurations.
3.4. Fusing of Voltage Sensing Inputs
The input voltage lines should be protected as per electrical code requirements. This is also good practice to facilitate an
easy disconnect means for servicing the meter. In some cases, the voltage may be tapped off of existing fuses or
breakers. If this is not possible, Elkor recommends a 1A or lower fuse (fast acting) for protection of the installation wiring.
The WattsOn voltage inputs are high impedance (> 1.5MΩ) and draw negligible current (less than 0.3mA max).
3.5. Enclosure Mounting
The WattsOn is housed in a UL 94V-0 plastic enclosure intended for either DIN mount installation or wall mounted
installation All of the input (bottom) and output (top) signals are available on the exterior of the enclosure. The unit
does not contain any user serviceable parts and thus should not be accessed by the user.

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3.6. Commissioning Flowchart
The following chart summarizes the procedure to install and set up the WattsOn device for basic use.
Connect up to three current transformers to the current input terminals (bottom-right green) on the device.
Observe the polarity as indicated on the CTs –reversing the leads or mounting the CTs backwards will result in
negative power and energy accumulation.
Connect a 12-35 VDC / 24VAC power supply to the device’s black power terminal.
Connect the two or three-wire RS-485 line to the device’s top-right green terminal. The ground wire may be
optional for short distances. The Modbus specification recommends the use of shielded RS-485 cabling. Twisted
pair is recommended for noisy environments. Bus termination may be required for complex networks.
Connect the other end of the Modbus line to the Modbus master device (PLC, PC, etc.).
Program the CT Ratio primary (for 5A or millivolt CTs) or turn count (for milliamp CTs) into register 0x500 using
the Modbus master device. See Setting CT Ratios (p. 21)for details. If voltage transformers are being used,
program the transformer ratio into register 0x508 and 0x509.
Read the Debug Register 0x509 to test that the communications are functioning correctly. The register should
read 12345 (0x3039 in hexadecimal).
Configure the device’s Modbus address by setting the hardware address switch. The address of each device on the
RS-485 line must be unique. If only one device on the line, it can be left at the default setting (1). Addresses from
1 to 15 can be set via the switch, and if necessary higher addresses can be set over Modbus once communication
is established; see 3.7, Digital Communications (p. 10). The address must not be set to 0 for normal
operation.
(below) for details or for higher addresses.
For safety reasons, ensure that any live voltages are turned off while connecting the voltage leads.
Connect line voltage leads to the voltage input terminals (bottom-left green. The device will accept up to 347V L-N
(or 600V L-L) without a transformer. For higher voltages, potential transformers are required.
Relay outputs may be wired (for example, with pulse counters).

ELKOR TECHNOLOGIES INC. - Page 10 - WattsOn-Mark II –USER MANUAL
3.7. Digital Communications
The WattsOn has an RS-485 port which communicates using the Modbus RTU protocol.
The RS-485 port comes factory-programmed with the indicated settings below. The baud rate, parity, and stop bit
settings can be changed via Modbus; see 5.7.2, Configuring Serial Parameters (p. 28).
Parameter
Default Setting
Modbus address
1
Baud rate
9600
Parity
None
Data bits
8
Stop bits
1
Every Modbus device on an RS-485 network must be assigned a unique Modbus Address. This address is used to
specifically identify the target device for querying by the master. Valid Modbus addresses are between 1-247.
Using the rotary switch, addresses from 1-15 can be set. The switch indicates numbers as hexadecimal values, with 1-9
being shown as normal, “A”representing 10, “B”representing 11, and so on. When the rotary switch is set to F (15) the
device will instead use an address programmed into the unit. The internally programmed address defaults to 15, to match
the rotary switch setting. See section 5.7.1, Modbus Addresses above 15 (p. 28) for details on setting extended
Modbus addresses using Modbus.
Address 0 is not a valid Modbus address; it is used for troubleshooting purposes only. See section 5.7.2, Configuring
Serial Parameters (p. 28) for details on using address 0.

ELKOR TECHNOLOGIES INC. - Page 11 - WattsOn-Mark II –USER MANUAL
4. COMMUNICATION
4.1. Modbus Protocol
The WattsOn communicates using Modbus RTU, a digital communication protocol over an RS-485 port. This protocol is
supported by various PC software applications, PLCs, data logging devices, and other Modbus “master”devices, which
can be used to communicate with the WattsOn. The WattsOn is defined as a Modbus “slave”device, meaning that it
responds to queries sent by the Modbus “master”device.
A Modbus slave device defines blocks of “registers”that contain information, each with a particular address. Each register
contains a 16-byte field of data which can be read by the master device. The registers defined by the WattsOn are
described in section 5, Register Map (p. 13).
For technical details on the Modbus protocol, see Appendix B, Modbus Protocol Details (p. 41), or see
the official Modbus Application Specification available for free from http://www.modbus.org/specs.php.
4.2. Modbus Functions
The WattsOn supports a number of different Modbus functions used to query the device or issue commands. Some
Modbus software/devices require the user specify specific Modbus functions. Others are more sophisticated, and will
automatically use the appropriate functions as needed, without requiring detailed knowledge of the Modbus protocol.
4.2.1. Supported Functions
The WattsOn supports the following Modbus functions:
Function Name
Function Code
Description
Read Holding Registers
03 (0x03)
Reads the data contained in one or more registers (identical to function 04 on this device).
Read Input Registers
04 (0x04)
Reads the data contained in one or more registers (identical to function 03 on this device).
Write Register
06 (0x06)
Writes data to a single register.
Diagnostics
08 (0x08)
Return Query Data
00 (0x00)
The Diagnostics function is a series of sub-
functions that assist in diagnosing
communication problems.
See Diagnostic Functions (below) for details
on each one.
Clear Counters
10 (0x0A)
Bus Message Count
11 (0x0B)
Bus Comm Error Count
12 (0x0C)
Bus Exception Count
13 (0x0D)
Slave Message Count
14 (0x0E)
Get Event Counter
11 (0x0B)
Reads a count of successful messages since power-on, excluding function 11 messages.
Write Multiple Registers
16 (0x10)
Writes data to one or more registers.
Report Slave ID
17 (0x11)
Returns various information used to identify this device. See Slave ID (below).
Write Mask Register
22 (0x16)
Modifies data in a single register based on an OR mask and an AND mask.
Read/Write Registers
23 (0x17)
Writes data to one or more registers, and then reads data from one or more registers.
Read Device ID
43 (0x2B)/14 (0x0E)
Reads various text strings giving device parameters. See Device ID (next page).
4.2.2. Diagnostic Functions
The WattsOn implements various diagnostic functions to assist in verifying and diagnosing communication problems. The
Diagnostic function is divided into a number of sub-functions each identified by a sub-function code. The following table
summarizes the diagnostic sub-functions implemented by this device.
Description
Sub-Function
Description
Return Query Data
00 (0x00)
Sends dummy data to the device, which is then returned as-is. Used for testing communication.
Clear Counters
10 (0x0A)
Clears all counters associated with the communication system, including the Bus Message
Counter, the Bus Comm Error Counter, the Bus Exception Counter, the Slave Message Counter,
and the Event Counter (also used in function 11).
Bus Message Count
11 (0x0B)
Returns the number of messages that the device has detected since power-up. These messages
were not necessarily valid or addressed to this device.
Bus Comm Error Count
12 (0x0C)
Returns the number of CRC errors detected by the device since power-up. The messages
containing these CRC errors were not necessarily addressed to this device.
Bus Exception Count
13 (0x0D)
Returns the number of exception responses returned by this device since power-up.
Slave Message Count
14 (0x0E)
Returns the count of messages addressed to this device that were received since power-up.

ELKOR TECHNOLOGIES INC. - Page 12 - WattsOn-Mark II –USER MANUAL
4.2.3. Slave ID
The WattsOn implements function 17, Report Slave ID, which returns three separate pieces of information. It returns an
ID code identifying this particular device, a status code indicating if the device is running or not, and a null-terminated
text string identifying this particular device.
Field
Data
ID Code
130
Status
0xFF (ON) when running normally, 0x00 (OFF) when in bootloader mode.
Text String
An ASCII text string containing the name of the product, its input configuration (mA, mV, or 5A), and its hardware and software version.
The string is null-terminated, meaning a 0 is transmitted after the last character.
For example, “Elkor Technologies W2-M1-mA Hardware 1.00 Firmware 1.00”.
While in bootloader mode, the string returned contains the bootloader version, for example, “Elkor Technologies Bootloader 1.00”.
4.2.4. Device ID
The WattsOn implements the Read Device ID function, which provides access to various strings that identify various
device properties. This is sub-function 14 (0x0E) of function 43 (0x2B), Encapsulated Interface Transport. The WattsOn
implements this function at the highest Conformity Level of 0x83 (basic, regular, and extended identification, stream or
individual access).
Each string, called an “object”, is accessed with a number, called the object ID. The WattsOn defines the following
objects, which can be read using this function.
Object
Object ID
Category
Value
VendorName
0 (0x00)
Standard (Basic)
“Elkor Technologies”
ProductCode
1 (0x01)
Standard (Basic)
“W2”
MajorMinorRevision
2 (0x02)
Standard (Basic)
The firmware version of the device, such as “1.00”
VendorUrl
3 (0x03)
Standard (Regular)
“http://www.elkor.net”
ProductName
4 (0x04)
Standard (Regular)
“WattsOn-Mark II”
ModelName
5 (0x05)
Standard (Regular)
The device’s model name, for example, “W2-M1-mA”
UserApplicationName
6 (0x06)
Standard (Regular)
“Elkor Firmware”
HardwareRevision
128 (0x80)
Extended
The hardware version on the device, such as “1.00”
BootloaderRevision
129 (0x81)
Extended
The bootloader version on the device, such as “1.00”
SerialNumber
130 (0x82)
Extended
The serial number of the device, such as “12345”
DeviceID
131 (0x83)
Extended
130

ELKOR TECHNOLOGIES INC. - Page 13 - WattsOn-Mark II –USER MANUAL
5. REGISTER MAP
5.1. Register Addressing Conventions
There are several different conventions for specifying the address of a particular register. Various conventions are used in
different software programs, PLCs, and other devices. Three common conventions are described below.
Offsets: Addresses are presented as hexadecimal numbers (shown with the “0x”
prefix) with the first address starting at address 0. This is how addresses are
transmitted digitally over the serial cable, and many software packages describe
Modbus addresses.
PLC-style addresses: Addresses are presented as 5-digit decimal numbers, starting
with a “3”or a “4”indicating whether they are considered “input registers”which are
read-only, or “holding registers”which are read-write (respectively). The first input
register is defined as 30001, and the first holding register is defined as 40001. For ease
of integration, this device treats both Holding Registers and Input Registers as
identical; therefore, either 30000-based addresses or 40000-based addresses will work
with the WattsOn, though only 40000-based addresses can be written to. Many PLCs
and some other devices describe Modbus addresses in this manner.
Register numbers: Addresses are presented as decimal numbers, with the first register defined as register 1.
These are similar to the PLC-style addresses described above, without “3”or “4”prefix. Some software packages
describe Modbus addresses in this manner.
The address of each register is presented in the first two styles in this manual. The required convention that is used
depends on the Modbus master software or device.
5.2. Register Size
Modbus registers are defined as each containing 16 bits of information. In this document, some registers are described as
being 32-bits wide, rather than 16. In these cases, two consecutive registers are concatenated together in order to obtain
the 32-bit value. Most modern Modbus software and hardware devices understand the notion of 32-bit registers, and will
do this processing, provided the data is configured as a 32-bit register.
Example: Register 0x100 is a 32-bit register. Suppose a read of register 0x100 returns 0x0003, and a
read of register 0x101 returns 0x0D40. Concatenate these two registers together to get a hexadecimal
value of 0x00030D40, or a decimal value of 200,000.
By default, the higher-order 16-bit word of a 32-bit register is the register with the lower address, and the lower-order
word is at the higher address. Most Modbus software and devices will interpret 32-bit registers this way. Alternatively, the
WattsOn can be configured to reverse the byte ordering, so that the higher-order word is at the higher address, and the
lower-order word is at the lower address. See 5.6.6, Setting 32-bit Endianness (p. 23)for details on how to configure
this setting.
5.3. Data Types
Registers contain data in one of four different types. Data types are given in the register tables with a single letter code in
the “Type”column to indicate the type. The types are as follows.
Type
Code
Description
Unsigned
Integer
U
Positive whole numbers (no sign). Can range from 0 to 65,535 for 16-bit registers, and 0 to 4,294,967,295 for 32-bit
registers.
Signed
Integer
S
Positive or negative whole numbers. Represented in 2’s complement format. Can range from -32,768 to +32,767 for 16-bit
registers and -2,147,483,648 to +2,147,483,647 for 32-bit registers.
Floating-Point
F
Positive or negative decimal numbers. Represented in IEEE 754 format. Can represent values from negative infinity to
positive infinity, at decreasing levels of resolution as the number because larger.
Boolean
B
True or false. False is represented by the value 0, true is represented by the value 1.
Examples
Offset: 0x0
PLC-style: 40001
Register No: 1
Offset: 0x10
PLC-style: 40017
Register No: 17
Offset: 0x200
PLC-style: 40513
Register No: 513

ELKOR TECHNOLOGIES INC. - Page 14 - WattsOn-Mark II –USER MANUAL
5.4. Instantaneous Data Registers
Instantaneous data registers contain the real-time measurements from the input channels on the device, including
current, voltage, power, power factor, and frequency. For energy registers, see 5.5, Accumulated Data Registers (p.
15). The instantaneous registers are presented in two different formats, each in a separate block of registers –as
floating-point data (for modern systems), and as integer data (for systems which do not support floating-point data). It is
recommended to read the floating-point data if possible, as there is then no need to scale the registers manually.
Both integer and floating-point registers incorporate the CT and PT ratios entered into the configuration registers
described in section 5.6, Configuration and Status Registers (p. 21).
5.4.1. Integer Instantaneous Data Registers
The following registers are 32-bit integer representations of the measured parameters. To allow integer registers to
represent decimal numbers, the integer registers are scaled according to a scaling factor. Divide the value read from
these registers by the scaling factor in the Scale column to get a decimal value in the units specified by the Units column.
Example: If you read the value “4501”from the Current A register, divide 4501 by the scaling factor of
1000, to get a value of 4.501 Amps on channel A.
Name
Offset
Address
Size
Type
R/W
Units
Scale
Active Power Total
0x100
40257
32
S
R
W
10
Reactive Power Total
0x102
40259
32
S
R
VAR
10
Apparent Power Total
0x104
40261
32
S
R
VA
10
Voltage Average
0x106
40263
32
S
R
V
100
Voltage L-L Average
0x108
40265
32
S
R
V
100
Current Average
0x10A
40267
32
S
R
A
1000
System Power Factor
0x10C
40269
32
S
R
-
10000
System Frequency
0x10E
40271
32
S
R
Hz
1000
Voltage Phase Angle Average
0x110
40273
32
S
R
°
10
System Quadrant
0x112
40275
32
U
R
-
-
Reserved
0x114
40277
32
-
R
-
-
…
Reserved
0x11E
40287
32
-
R
-
-
Voltage A
0x120
40289
32
S
R
V
100
Voltage B
0x122
40291
32
S
R
V
100
Voltage C
0x124
40293
32
S
R
V
100
Voltage AB
0x126
40295
32
S
R
V
100
Voltage BC
0x128
40297
32
S
R
V
100
Voltage AC
0x12A
40299
32
S
R
V
100
Current A
0x12C
40301
32
S
R
A
1000
Current B
0x12E
40303
32
S
R
A
1000
Current C
0x130
40305
32
S
R
A
1000
Active Power A
0x132
40307
32
S
R
W
10
Active Power B
0x134
40309
32
S
R
W
10
Active Power C
0x136
40311
32
S
R
W
10
Reactive Power A
0x138
40313
32
S
R
VAR
10
Reactive Power B
0x13A
40315
32
S
R
VAR
10
Reactive Power C
0x13C
40317
32
S
R
VAR
10
Apparent Power A
0x13E
40319
32
S
R
VA
10
Apparent Power B
0x140
40321
32
S
R
VA
10
Apparent Power C
0x142
40323
32
S
R
VA
10
Power Factor A
0x144
40325
32
S
R
-
10000
Power Factor B
0x146
40327
32
S
R
-
10000
Power Factor C
0x148
40329
32
S
R
-
10000
Voltage Phase Angle AB
0x14A
40331
32
S
R
°
10
Voltage Phase Angle BC
0x14C
40333
32
S
R
°
10
Voltage Phase Angle AC
0x14E
40335
32
S
R
°
10
Quadrant A
0x150
40337
32
U
R
-
-
Quadrant B
0x152
40339
32
U
R
-
-
Quadrant C
0x154
40341
32
U
R
-
-
Sliding Window Power
0x156
40343
32
S
R
W
10

ELKOR TECHNOLOGIES INC. - Page 15 - WattsOn-Mark II –USER MANUAL
5.4.2. Floating-Point Instantaneous Data Registers
The following registers are 32-bit floating-point representations of the measured parameters, expressed in IEEE 754
format. Unlike the integer registers described above, these registers are capable of representing decimal numbers and
therefore do not require any scaling.
Name
Offset
Address
Size
Type
R/W
Units
Active Power Total
0x200
40513
32
F
R
kW
Reactive Power Total
0x202
40515
32
F
R
kVAR
Apparent Power Total
0x204
40517
32
F
R
kVA
Voltage Average
0x206
40519
32
F
R
V
Voltage L-L Average
0x208
40521
32
F
R
V
Current Average
0x20A
40523
32
F
R
A
System Power Factor
0x20C
40525
32
F
R
-
System Frequency
0x20E
40527
32
F
R
Hz
Voltage Average Angle
0x210
40529
32
F
R
°
System Quadrant
0x212
40531
32
F
R
-
Reserved
0x214
40533
32
-
R
-
…
Reserved
0x21E
40543
32
-
R
-
Voltage A
0x220
40545
32
F
R
V
Voltage B
0x222
40547
32
F
R
V
Voltage C
0x224
40549
32
F
R
V
Voltage AB
0x226
40551
32
F
R
V
Voltage BC
0x228
40553
32
F
R
V
Voltage AC
0x22A
40555
32
F
R
V
Current A
0x22C
40557
32
F
R
A
Current B
0x22E
40559
32
F
R
A
Current C
0x230
40561
32
F
R
A
Active Power A
0x232
40563
32
F
R
kW
Active Power B
0x234
40565
32
F
R
kW
Active Power C
0x236
40567
32
F
R
kW
Reactive Power A
0x238
40569
32
F
R
kVAR
Reactive Power B
0x23A
40571
32
F
R
kVAR
Reactive Power C
0x23C
40573
32
F
R
kVAR
Apparent Power A
0x23E
40575
32
F
R
kVA
Apparent Power B
0x240
40577
32
F
R
kVA
Apparent Power C
0x242
40579
32
F
R
kVA
Power Factor A
0x244
40581
32
F
R
-
Power Factor B
0x246
40583
32
F
R
-
Power Factor C
0x248
40585
32
F
R
-
Voltage Angle AB
0x24A
40587
32
F
R
°
Voltage Angle BC
0x24C
40589
32
F
R
°
Voltage Angle AC
0x24E
40591
32
F
R
°
Quadrant A
0x250
40593
32
F
R
-
Quadrant B
0x252
40595
32
F
R
-
Quadrant C
0x254
40597
32
F
R
-
Sliding Window Power
0x256
40599
32
F
R
kW
5.5. Accumulated Data Registers
Accumulated data registers contain energy data accumulated over time from the input channels on the device, including
real energy, apparent energy, and reactive energy. For instantaneous registers such as power and current, see 5.4,
Instantaneous Data Registers (p. 14).
There are four blocks of accumulated data registers in total. Two blocks reflect resets –they can be reset to 0 at any time.
The remaining two blocks do not reflect resets, and retain their total accumulated value despite any number of resets
issued by the user. Revenue-grade metering applications or applications that do not require the ability to reset the meter
should always read the non-resettable registers.

ELKOR TECHNOLOGIES INC. - Page 16 - WattsOn-Mark II –USER MANUAL
Resettable and non-resettable registers each have a floating-point block (for modern systems) and an integer block (for
systems that do not support floating-point data). It is recommended to read the floating-point data if possible, as there is
then no need to multiply the results by any scaling factors in that case.
The WattsOn’s internal accumulated energy will never overflow; however, when reading 32-bit integer representations of
the energy registers in combination with large CT or PT ratios, 32-bit integers may not be large enough to contain the
information. To address this problem, the WattsOn has an Energy Integer Divider Register , 0x52E which is applied to the
energy values as they are read. By default, this is set to 100. This sets the resolution of the energy registers to 100
Wh/VAh/VARh by default. The maximum resolution is 1 Wh/VAh/VARh (including CT/PT scaling) with the divider set to 1.
This divider can be adjusted if desired, either to accommodate larger CT/PT ratios, or if greater resolution is desired.
Multiply the value read from the registers by the value of the Energy Integer Divider register to obtain the units
expressed in the Units column of the following tables. See 5.6.13, Energy Integer Divider (p. 26) for details on the
Energy Integer Divider register.
Example: If you read the value “45”from the Net Energy A register, and “100”from the Energy Integer
Divisor register. Multiply 45 by 100 to get a value of 4500 Wh (or 4.5 kW) on channel A.
The floating-point representations of the energy registers do not use the Energy Integer Divider Register , as they can
represent arbitrarily large values. For this reason, reading the floating-point registers is recommended. However, their
resolution will decrease as values grow larger.

ELKOR TECHNOLOGIES INC. - Page 17 - WattsOn-Mark II –USER MANUAL
5.5.1. Resettable Integer Accumulated Data Registers
These registers reflect resets made using the Energy Reset register 0x524; see 5.6.8, Resetting Accumulated
Energy (p. 24) for details.
Name
Offset
Address
Size
Type
R/W
Units
Net Total Energy (Resettable)
0x1000
44097
32
S
R
Wh
Total Net Apparent Energy (Resettable)
0x1002
44099
32
S
R
VAh
Total Import Energy (Resettable)
0x1004
44101
32
S
R
Wh
Total Export Energy (Resettable)
0x1006
44103
32
S
R
Wh
Total Import Apparent Energy (Resettable)
0x1008
44105
32
S
R
VAh
Total Export Apparent Energy (Resettable)
0x100A
44107
32
S
R
VAh
Q1 Total Reactive Energy (Resettable)
0x100C
44109
32
S
R
VARh
Q2 Total Reactive Energy (Resettable)
0x100E
44111
32
S
R
VARh
Q3 Total Reactive Energy (Resettable)
0x1010
44113
32
S
R
VARh
Q4 Total Reactive Energy (Resettable)
0x1012
44115
32
S
R
VARh
Q1+Q2 Total Inductive Reactive Energy (Resettable)
0x1014
44117
32
S
R
VARh
Q3+Q4 Total Capacitive Reactive Energy (Resettable)
0x1016
44119
32
S
R
VARh
Reserved
0x1018
44121
32
-
R
-
…
Reserved
0x101E
44127
32
-
R
-
Net Energy (Resettable) A
0x1020
44129
32
S
R
Wh
Net Energy (Resettable) B
0x1022
44131
32
S
R
Wh
Net Energy (Resettable) C
0x1024
44133
32
S
R
Wh
Net Apparent Energy (Resettable) A
0x1026
44135
32
S
R
VAh
Net Apparent Energy (Resettable) B
0x1028
44137
32
S
R
VAh
Net Apparent Energy (Resettable) C
0x102A
44139
32
S
R
VAh
Import Energy (Resettable) A
0x102C
44141
32
S
R
Wh
Import Energy (Resettable) B
0x102E
44143
32
S
R
Wh
Import Energy (Resettable) C
0x1030
44145
32
S
R
Wh
Export Energy (Resettable) A
0x1032
44147
32
S
R
Wh
Export Energy (Resettable) B
0x1034
44149
32
S
R
Wh
Export Energy (Resettable) C
0x1036
44151
32
S
R
Wh
Import Apparent Energy (Resettable) A
0x1038
44153
32
S
R
VAh
Import Apparent Energy (Resettable) B
0x103A
44155
32
S
R
VAh
Import Apparent Energy (Resettable) C
0x103C
44157
32
S
R
VAh
Export Apparent Energy (Resettable) A
0x103E
44159
32
S
R
VAh
Export Apparent Energy (Resettable) B
0x1040
44161
32
S
R
VAh
Export Apparent Energy (Resettable) C
0x1042
44163
32
S
R
VAh
Q1 Reactive Energy (Resettable) A
0x1044
44165
32
S
R
VARh
Q1 Reactive Energy (Resettable) B
0x1046
44167
32
S
R
VARh
Q1 Reactive Energy (Resettable) C
0x1048
44169
32
S
R
VARh
Q2 Reactive Energy (Resettable) A
0x104A
44171
32
S
R
VARh
Q2 Reactive Energy (Resettable) B
0x104C
44173
32
S
R
VARh
Q2 Reactive Energy (Resettable) C
0x104E
44175
32
S
R
VARh
Q3 Reactive Energy (Resettable) A
0x1050
44177
32
S
R
VARh
Q3 Reactive Energy (Resettable) B
0x1052
44179
32
S
R
VARh
Q3 Reactive Energy (Resettable) C
0x1054
44181
32
S
R
VARh
Q4 Reactive Energy (Resettable) A
0x1056
44183
32
S
R
VARh
Q4 Reactive Energy (Resettable) B
0x1058
44185
32
S
R
VARh
Q4 Reactive Energy (Resettable) C
0x105A
44187
32
S
R
VARh

ELKOR TECHNOLOGIES INC. - Page 18 - WattsOn-Mark II –USER MANUAL
5.5.2. Resettable Floating-Point Accumulated Data Registers
The following registers are 32-bit floating-point representations of the accumulated energy parameters, expressed in IEEE
754 format. These registers reflect resets made using the Energy Reset register 0x524; see 5.6.8, Resetting
Accumulated Energy (p. 24) for details.
Name
Offset
Address
Size
Type
R/W
Units
Net Total Energy (Resettable)
0x1100
44353
32
F
R
kWh
Total Net Apparent Energy (Resettable)
0x1102
44355
32
F
R
kVAh
Total Import Energy (Resettable)
0x1104
44357
32
F
R
kWh
Total Export Energy (Resettable)
0x1106
44359
32
F
R
kWh
Total Import Apparent Energy (Resettable)
0x1108
44361
32
F
R
kVAh
Total Export Apparent Energy (Resettable)
0x110A
44363
32
F
R
kVAh
Q1 Total Reactive Energy (Resettable)
0x110C
44365
32
F
R
kVARh
Q2 Total Reactive Energy (Resettable)
0x110E
44367
32
F
R
kVARh
Q3 Total Reactive Energy (Resettable)
0x1110
44369
32
F
R
kVARh
Q4 Total Reactive Energy (Resettable)
0x1112
44371
32
F
R
kVARh
Q1+Q2 Total Inductive Reactive Energy (Resettable)
0x1114
44373
32
F
R
VARh
Q3+Q4 Total Capacitive Reactive Energy (Resettable)
0x1116
44375
32
F
R
VARh
Reserved
0x1118
44377
32
-
R
-
…
Reserved
0x111E
44383
32
-
R
-
Net Energy (Resettable) A
0x1120
44385
32
F
R
kWh
Net Energy (Resettable) B
0x1122
44387
32
F
R
kWh
Net Energy (Resettable) C
0x1124
44389
32
F
R
kWh
Net Apparent Energy (Resettable) A
0x1126
44391
32
F
R
kVAh
Net Apparent Energy (Resettable) B
0x1128
44393
32
F
R
kVAh
Net Apparent Energy (Resettable) C
0x112A
44395
32
F
R
kVAh
Import Energy (Resettable) A
0x112C
44397
32
F
R
kWh
Import Energy (Resettable) B
0x112E
44399
32
F
R
kWh
Import Energy (Resettable) C
0x1130
44401
32
F
R
kWh
Export Energy (Resettable) A
0x1132
44403
32
F
R
kWh
Export Energy (Resettable) B
0x1134
44405
32
F
R
kWh
Export Energy (Resettable) C
0x1136
44407
32
F
R
kWh
Import Apparent Energy (Resettable) A
0x1138
44409
32
F
R
kVAh
Import Apparent Energy (Resettable) B
0x113A
44411
32
F
R
kVAh
Import Apparent Energy (Resettable) C
0x113C
44413
32
F
R
kVAh
Export Apparent Energy (Resettable) A
0x113E
44415
32
F
R
kVAh
Export Apparent Energy (Resettable) B
0x1140
44417
32
F
R
kVAh
Export Apparent Energy (Resettable) C
0x1142
44419
32
F
R
kVAh
Q1 Reactive Energy (Resettable) A
0x1144
44421
32
F
R
kVARh
Q1 Reactive Energy (Resettable) B
0x1146
44423
32
F
R
kVARh
Q1 Reactive Energy (Resettable) C
0x1148
44425
32
F
R
kVARh
Q2 Reactive Energy (Resettable) A
0x114A
44427
32
F
R
kVARh
Q2 Reactive Energy (Resettable) B
0x114C
44429
32
F
R
kVARh
Q2 Reactive Energy (Resettable) C
0x114E
44431
32
F
R
kVARh
Q3 Reactive Energy (Resettable) A
0x1150
44433
32
F
R
kVARh
Q3 Reactive Energy (Resettable) B
0x1152
44435
32
F
R
kVARh
Q3 Reactive Energy (Resettable) C
0x1154
44437
32
F
R
kVARh
Q4 Reactive Energy (Resettable) A
0x1156
44439
32
F
R
kVARh
Q4 Reactive Energy (Resettable) B
0x1158
44441
32
F
R
kVARh
Q4 Reactive Energy (Resettable) C
0x115A
44443
32
F
R
kVARh

ELKOR TECHNOLOGIES INC. - Page 19 - WattsOn-Mark II –USER MANUAL
5.5.3. Revenue (Non-Resettable) Integer Accumulated Data Registers
These registers do not reflect resets made using the Energy Reset register.
Name
Offset
Address
Size
Type
R/W
Units
Net Total Energy (Revenue)
0x1200
44609
32
S
R
Wh
Total Net Apparent Energy (Revenue)
0x1202
44611
32
S
R
VAh
Total Import Energy (Revenue)
0x1204
44613
32
S
R
Wh
Total Export Energy (Revenue)
0x1206
44615
32
S
R
Wh
Total Import Apparent Energy (Revenue)
0x1208
44617
32
S
R
VAh
Total Export Apparent Energy (Revenue)
0x120A
44619
32
S
R
VAh
Q1 Total Reactive Energy (Revenue)
0x120C
44621
32
S
R
VARh
Q2 Total Reactive Energy (Revenue)
0x120E
44623
32
S
R
VARh
Q3 Total Reactive Energy (Revenue)
0x1210
44625
32
S
R
VARh
Q4 Total Reactive Energy (Revenue)
0x1212
44627
32
S
R
VARh
Q1+Q2 Total Inductive Reactive Energy (Revenue)
0x1214
44629
32
S
R
VARh
Q3+Q4 Total Capacitive Reactive Energy (Revenue)
0x1216
44631
32
S
R
VARh
Reserved
0x1218
44633
32
-
R
-
…
Reserved
0x121E
44639
32
-
R
-
Net Energy (Revenue) A
0x1220
44641
32
S
R
Wh
Net Energy (Revenue) B
0x1222
44643
32
S
R
Wh
Net Energy (Revenue) C
0x1224
44645
32
S
R
Wh
Net Apparent Energy (Revenue) A
0x1226
44647
32
S
R
VAh
Net Apparent Energy (Revenue) B
0x1228
44649
32
S
R
VAh
Net Apparent Energy (Revenue) C
0x122A
44651
32
S
R
VAh
Import Energy (Revenue) A
0x122C
44653
32
S
R
Wh
Import Energy (Revenue) B
0x122E
44655
32
S
R
Wh
Import Energy (Revenue) C
0x1230
44657
32
S
R
Wh
Export Energy (Revenue) A
0x1232
44659
32
S
R
Wh
Export Energy (Revenue) B
0x1234
44661
32
S
R
Wh
Export Energy (Revenue) C
0x1236
44663
32
S
R
Wh
Import Apparent Energy (Revenue) A
0x1238
44665
32
S
R
VAh
Import Apparent Energy (Revenue) B
0x123A
44667
32
S
R
VAh
Import Apparent Energy (Revenue) C
0x123C
44669
32
S
R
VAh
Export Apparent Energy (Revenue) A
0x123E
44671
32
S
R
VAh
Export Apparent Energy (Revenue) B
0x1240
44673
32
S
R
VAh
Export Apparent Energy (Revenue) C
0x1242
44675
32
S
R
VAh
Q1 Reactive Energy (Revenue) A
0x1244
44677
32
S
R
VARh
Q1 Reactive Energy (Revenue) B
0x1246
44679
32
S
R
VARh
Q1 Reactive Energy (Revenue) C
0x1248
44681
32
S
R
VARh
Q2 Reactive Energy (Revenue) A
0x124A
44683
32
S
R
VARh
Q2 Reactive Energy (Revenue) B
0x124C
44685
32
S
R
VARh
Q2 Reactive Energy (Revenue) C
0x124E
44687
32
S
R
VARh
Q3 Reactive Energy (Revenue) A
0x1250
44689
32
S
R
VARh
Q3 Reactive Energy (Revenue) B
0x1252
44691
32
S
R
VARh
Q3 Reactive Energy (Revenue) C
0x1254
44693
32
S
R
VARh
Q4 Reactive Energy (Revenue) A
0x1256
44695
32
S
R
VARh
Q4 Reactive Energy (Revenue) B
0x1258
44697
32
S
R
VARh
Q4 Reactive Energy (Revenue) C
0x125A
44699
32
S
R
VARh

ELKOR TECHNOLOGIES INC. - Page 20 - WattsOn-Mark II –USER MANUAL
5.5.4. Revenue (Non-Resettable) Floating-Point Accumulated Data Registers
The following registers are 32-bit floating-point representations of the accumulated energy parameters, expressed in IEEE
754 format. These registers do not reflect resets made using the Energy Reset register.
Name
Offset
Address
Size
Type
R/W
Units
Net Total Energy (Revenue)
0x1300
44865
32
F
R
kWh
Total Net Apparent Energy (Revenue)
0x1302
44867
32
F
R
kVAh
Total Import Energy (Revenue)
0x1304
44869
32
F
R
kWh
Total Export Energy (Revenue)
0x1306
44871
32
F
R
kWh
Total Import Apparent Energy (Revenue)
0x1308
44873
32
F
R
kVAh
Total Export Apparent Energy (Revenue)
0x130A
44875
32
F
R
kVAh
Q1 Total Reactive Energy (Revenue)
0x130C
44877
32
F
R
kVARh
Q2 Total Reactive Energy (Revenue)
0x130E
44879
32
F
R
kVARh
Q3 Total Reactive Energy (Revenue)
0x1310
44881
32
F
R
kVARh
Q4 Total Reactive Energy (Revenue)
0x1312
44883
32
F
R
kVARh
Q1+Q2 Total Inductive Reactive Energy (Revenue)
0x1314
44885
32
S
R
VARh
Q3+Q4 Total Capacitive Reactive Energy (Revenue)
0x1316
44887
32
S
R
VARh
Reserved
0x1318
44889
32
-
R
-
…
Reserved
0x131E
44895
32
-
R
-
Net Energy (Revenue) A
0x1320
44897
32
F
R
kWh
Net Energy (Revenue) B
0x1322
44899
32
F
R
kWh
Net Energy (Revenue) C
0x1324
44901
32
F
R
kWh
Net Apparent Energy (Revenue) A
0x1326
44903
32
F
R
kVAh
Net Apparent Energy (Revenue) B
0x1328
44905
32
F
R
kVAh
Net Apparent Energy (Revenue) C
0x132A
44907
32
F
R
kVAh
Import Energy (Revenue) A
0x132C
44909
32
F
R
kWh
Import Energy (Revenue) B
0x132E
44911
32
F
R
kWh
Import Energy (Revenue) C
0x1330
44913
32
F
R
kWh
Export Energy (Revenue) A
0x1332
44915
32
F
R
kWh
Export Energy (Revenue) B
0x1334
44917
32
F
R
kWh
Export Energy (Revenue) C
0x1336
44919
32
F
R
kWh
Import Apparent Energy (Revenue) A
0x1338
44921
32
F
R
kVAh
Import Apparent Energy (Revenue) B
0x133A
44923
32
F
R
kVAh
Import Apparent Energy (Revenue) C
0x133C
44925
32
F
R
kVAh
Export Apparent Energy (Revenue) A
0x133E
44927
32
F
R
kVAh
Export Apparent Energy (Revenue) B
0x1340
44929
32
F
R
kVAh
Export Apparent Energy (Revenue) C
0x1342
44931
32
F
R
kVAh
Q1 Reactive Energy (Revenue) A
0x1344
44933
32
F
R
kVARh
Q1 Reactive Energy (Revenue) B
0x1346
44935
32
F
R
kVARh
Q1 Reactive Energy (Revenue) C
0x1348
44937
32
F
R
kVARh
Q2 Reactive Energy (Revenue) A
0x134A
44939
32
F
R
kVARh
Q2 Reactive Energy (Revenue) B
0x134C
44941
32
F
R
kVARh
Q2 Reactive Energy (Revenue) C
0x134E
44943
32
F
R
kVARh
Q3 Reactive Energy (Revenue) A
0x1350
44945
32
F
R
kVARh
Q3 Reactive Energy (Revenue) B
0x1352
44947
32
F
R
kVARh
Q3 Reactive Energy (Revenue) C
0x1354
44949
32
F
R
kVARh
Q4 Reactive Energy (Revenue) A
0x1356
44951
32
F
R
kVARh
Q4 Reactive Energy (Revenue) B
0x1358
44953
32
F
R
kVARh
Q4 Reactive Energy (Revenue) C
0x135A
44955
32
F
R
kVARh