Satec PM130EH SERIES User manual

SERIES PM130EH POWERMETERS
COMMUNICATIONS
Modbus Communications Protocol
REFERENCE GUIDE

Every effort has been made to ensure that the material herein is complete and accurate. However, the
manufacturer is not responsible for any mistakes in printing or faulty instructions contained in this book.
Notification of any errors or misprints will be received with appreciation.
For further information regarding a particular installation, operation or maintenance of equipment, contact
the manufacturer or your local representative or distributor.
This book is copyrighted. No part of this book may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise
without the prior written permission of the manufacturer.
This revision is applicable to Version 3.54 or later of the PM130EH instrument.
Modbus is a trademark of Modicon, Inc.
BG0373 Rev.A2

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Table of Contents
1 GENERAL ............................................................................................. 4
2 MODBUS FRAMING ............................................................................. 5
2.1 Transmission Mode ................................................................................................ 5
2.2 The RTU Frame Format ......................................................................................... 5
2.3 Address Field.......................................................................................................... 5
2.4 Function Field ......................................................................................................... 5
2.5 Data Field ............................................................................................................... 6
2.6 Error Check Field.................................................................................................... 6
3 MODBUS MESSAGE FORMATS ......................................................... 7
3.1 Function 03 - Read Multiple Registers ................................................................... 7
3.2 Function 04 - Read Multiple Registers ................................................................... 7
3.3 Function 06 - Write Single Register........................................................................ 7
3.4 Function 16 - Write Multiple Registers ................................................................... 8
3.5 Function 08 - Loop-back Communications Test..................................................... 8
3.6 Exception Responses............................................................................................. 9
4 PROTOCOL IMPLEMENTATION ....................................................... 10
4.1 Modbus Register Addresses ................................................................................ 10
4.2 Data Formats ........................................................................................................ 10
4.2.1 16-bit Integer Format .................................................................................... 10
4.2.2 32-bit Modulo 10000 Format ........................................................................ 12
4.2.3 32-bit Long Integer Format ........................................................................... 12
4.3 User Assignable Registers ................................................................................... 12
5 POWERMETER REGISTERS DESCRIPTION.................................... 14
5.1 Basic Data Registers Set...................................................................................... 14
5.2 Basic Setup........................................................................................................... 15
5.3 User Selectable Options Setup ............................................................................ 16
5.4 Communications Setup ........................................................................................ 16
5.5 Reset/Synchronization Registers ......................................................................... 16
5.6 Instrument Status.................................................................................................. 17
5.7 Extended Status ................................................................................................... 17
5.8 Extended Data Registers...................................................................................... 19
5.9 Alarm/Event Setpoints .......................................................................................... 24
5.10 Pulsing Setpoints ................................................................................................ 26
5.11 Relay Operation Control ..................................................................................... 26
5.12 Min/Max Log ....................................................................................................... 27

4
1 GENERAL
This document specifies a subset of the Modbus serial communications protocol used to transfer data
between a master computer station and the PM130EH. The document provides the complete information
necessary to develop a third-party communications software capable of communication with the Series
PM130EH Powermeters. Additional information concerning communications operation, configuring the
communications parameters, and communications connections is found in "Series PM130EH
Powermeters, Installation and Operation Manual".
IMPORTANT
In 3-wire connection schemes, the unbalanced current and phase readings for power factor, active power,
and reactive power will be zeros, because they have no meaning. Only the total three-phase power values
can be used.
Most of the instrument advanced features are configured using multiple setup parameters that can be
accessed in some contiguous registers. When writing the setup registers, it is recommended to write all the
registers at once using a single request, or to clear (zero) the setup before writing into separate registers.

5
2 MODBUS FRAMING
2.1 Transmission Mode
The protocol uses the Modbus Remote Terminal Unit (RTU) transmission mode. In RTU mode, data is
sent in 8-bit binary characters. The 8 bit even parity or 8 bit no parity data format must be selected when
configuring the instrument communications. The data format is shown in the following table.
Table 2-1 RTU Data Format
Field No. of bits
Start bit 1
Data bits c8
Parity (optional) 1
Stop bit 1
cLeast significant bit first
2.2 The RTU Frame Format
Frame synchronization is maintained in RTU transmission mode by simulating a synchronization message.
The receiving device monitors the elapsed time between receptions of characters. If three and one-half
character times elapse without a new character or completion of the frame, then the device flushes the
frame and assumes that the next byte received will be an address. The frame format is defined below.
The maximum query and response message length is 256 bytes including check characters.
RTU Message Frame Format
T1 T2 T3 Address Function Data CRC Check T1 T2 T3
8 bits 8 bits N * 8 bits 16 bits
2.3 Address Field
The address field contains a user assigned address (1-247) of the instrument that is to receive a message.
Address 0 is used in broadcast mode to transmit to all instruments (broadcast mode is available only for
functions 06 and 16). In this case all instruments receive the message and take action on the request, but
do not issue a response. In the PM130EH, the broadcast mode is supported only for register addresses
287-294 and 301-302 (reset energies and maximum demands), 3404-3415 (reset/clear registers), and
4352-4358 (real-time clock registers).
2.4 Function Field
The function field contains a function code that tells the instrument what action to perform. Function codes
used in the protocol are shown below in Table 2-2.
Table 2-2 Modbus Function Codes
Code (decimal) Meaning in Modbus Action
03 Read holding registers Read multiple registers
04 Read input registers Read multiple registers
06 Preset single register Write single register
16 Preset multiple registers Write multiple registers
08 Loop-back test Communications test
NOTE Broadcast mode available only for functions code 06 and 16.

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2.5 Data Field
The data field contains information needed by the instrument to perform a specific function, or data
collected by the instrument in response to a query.
IMPORTANT Fields composed of two bytes are sent in the order high byte first, low byte second.
2.6 Error Check Field
The error check field contains the Cyclical Redundancy Check (CRC) word. The start of the message is
ignored in calculating the CRC. The CRC-16 error check sequence is implemented as described in the
following paragraphs.
The message (data bits only, disregarding start/stop and optional parity bits) is considered one continuous
binary number whose most significant bit (MSB) is transmitted first. The message is pre-multiplied by x16
(shifted left 16 bits), and then divided by x16 + x15 + x2+ 1 expressed as a binary number
(11000000000000101). The integer quotient digits are ignored and the 16-bit remainder (initialized to all
ones at the start to avoid the case of all zeros being an accepted message) is appended to the message
(MSB first) as the two CRC check bytes. The resulting message including CRC, when divided by the same
polynomial (x16 + x15 + x2+ 1) at the receiver will give a zero remainder if no errors have occurred. (The
receiving unit recalculates the CRC and compares it to the transmitted CRC). All arithmetic is performed
modulo two (no carries).
The device used to serialize the data for transmission will send the conventional LSB or right-most bit of
each character first. In generating the CRC, the first bit transmitted is defined as the MSB of the dividend.
For convenience, and since there are no carries used in the arithmetic, let's assume while computing the
CRC that the MSB is on the right. To be consistent, the bit order of the generating polynomial must be
reversed. The MSB of the polynomial is dropped since it affects only the quotient and not the remainder.
This yields 1010 0000 0000 0001 (Hex A001). Note that this reversal of the bit order will have no effect
whatever on the interpretation or bit order of characters external to the CRC calculations.
The step by step procedure to form the CRC-16 check bytes is as follows:
1. Load a 16-bit register with all 1's.
2. Exclusive OR the first 8-bit byte with the low order byte of the 16-bit register, putting the result in the 16-
bit register.
3. Shift the 16-bit register one bit to the right.
4a. If the bit shifted out to the right (flag) is one, exclusive OR the generating polynomial 1010 000 000
0001 with the 16-bit register.
4b. If the bit shifted out to the right is zero, return to step 3.
5. Repeat steps 3 and 4 until 8 shifts have been performed.
6. Exclusive OR the next 8-bit byte with the 16-bit register.
7. Repeat step 3 through 6 until all bytes of the message have been exclusive ORed with the 16-bit
register and shifted 8 times.
8. When the 16-bit CRC is transmitted in the message, the low order byte will be transmitted first, followed
by the high order byte.
For detailed information about CRC calculation, refer to the Modbus Protocol Reference Guide.

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3 MODBUS MESSAGE FORMATS
3.1 Function 03 - Read Multiple Registers
This command allows the user to obtain contents of up to 125 contiguous registers from a single data
table.
Request
Instrument
Address
Function
(03)
Starting
Address
Word Count Error Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Starting Address Address of the first register to be read
Word Count The number of contiguous words to be read
Response
Instrument
Address
Function
(03)
Byte
Count
Data
Word 1
... Data
Word N
Error
Check
1 byte 1 byte 1 byte 2 bytes ... 2 bytes 2 bytes
The byte count field contains quantity of bytes to be returned.
3.2 Function 04 - Read Multiple Registers
This command allows the user to obtain contents of up to 125 contiguous registers from a single data
table. It can be used instead of function 03.
Request
Instrument
Address
Function
(04)
Starting
Address
Word Count Error Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Starting Address Address of the first register to be read
Word Count The number of contiguous words to be read
Response
Instrument
Address
Function
(04)
Byte
Count
Data
Word 1
... Data
Word N
Error
Check
1 byte 1 byte 1 byte 2 bytes ... 2 bytes 2 bytes
The byte count field contains quantity of bytes to be returned.
3.3 Function 06 - Write Single Register
This command allows the user to write the contents of a data register in any data table where a register
can be written.
Request
Instrument
Address
Function
(06)
Starting
Address
Data
Word
Error
check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Starting Address Address of the register to be written
Data Value Data to be written to the register

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Response
The normal response is the retransmission of the write request.
3.4 Function 16 - Write Multiple Registers
This request allows the user to write the contents of multiple contiguous registers to a single data table
where registers can be written.
Request
Instrument
Address
Function
(16)
Starting
Address
Word
Count
Byte
Count
1 byte 1 byte 2 bytes 2 bytes 1 byte
Data Word 1 ... ... ... Data Word N Error Check
2 bytes ... ... ... 2 bytes 2 bytes
Starting Address Address of the first register to be written
Word Count The number of contiguous words to be written
Byte Count The number of bytes to be written
Response
Instrument
Address
Function
(16)
Starting
Address
Word
Count
Error
Check
1 byte 1 byte 2 bytes 1 word 2 bytes
3.5 Function 08 - Loop-back Communications Test
The purpose of this request is to check the communications link between the specified instrument and PC.
Request
Instrument
Address
Function
(08)
Diagnostic
Code (0)
Data Error
Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Diagnostic Code Designates action to be taken in Loop-back test. The protocol
supports only Diagnostic Code 0 - return query data.
Data Query data. The data passed in this field will be returned to the
master through the instrument. The entire message returned will
be identical to the message transmitted by the master, field-per-
field.
Response
Instrument
Address
Function
(08)
Diagnostic
Code (0)
Data Error
Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
The normal response is the re-transmission of a test message.

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3.6 Exception Responses
The instrument sends an exception response when errors are detected in the received message. To
indicate that the response is notification of an error, the high order bit of the function code is set to 1.
Exception Response
Instrument
Address
Function (high
order bit is set to 1)
Exception
Code
Error Check
1 byte 1 byte 1 byte 2 byte
Exception response codes:
01 - Illegal function
02 - Illegal data address
03 - Illegal data value
06 - Busy, rejected message. The message was received without errors, but the instrument is being
programmed from the keypad (only for requests accessing setup registers).
NOTE When the character framing, parity, or redundancy check detects a communication error,
processing of the master's request stops. The instrument will not act on or respond to the message.

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4 PROTOCOL IMPLEMENTATION
4.1 Modbus Register Addresses
The PM130EH Modbus registers are referred to by using addresses in the range of 0 to 65535. From
within the Modbus applications, the PM130EH Modbus registers can be accessed by simulating holding
registers of the Modicon 584, 884 or 984 Programmable Controller, using a 5-digit “4XXXX” or 6-digit
“4XXXXX” addressing scheme. To map the PM130EH register address to the range of the Modbus holding
registers, add a value of 40001 to the PM130EH register address. When a register address exceeds 9999,
use a 6-digit addressing scheme by adding 400001 to the PM130EH register address.
4.2 Data Formats
The PM130EH uses three data formats to pass data between a master application and the instrument: a
16-bit integer format, a 32-bit modulo 10000 format, and a 32-bit long integer format.
4.2.1 16-bit Integer Format
A 16-bit data is transmitted in a single 16-bit Modbus register as unsigned (UINT16) or signed (INT16)
integer (whole) numbers without conversion or using pre-scaling to accommodate large-scale and
fractional numbers to a 16-bit register format. Scaling can be made using either the LIN3 linear conversion,
or decimal pre-scaling to pass fractional numbers in integer format.
Non-scaled data
The data will be presented exactly as retrieved by the communications program from the instrument. The
value range for unsigned data is 0 to 65535; for signed data the range is -32768 to 32767.
LIN3 (Linear) Scaling
This conversion maps the raw data received by the communications program in the range of 0-9999 onto
the user-defined LO scale/HI scale range. The conversion is carried out according to the formula:
LO
9999
)LOHI(Data_Raw
Value_Units_gEngineerin +
−×
=
where:
Engineering_Units_Value - the true value in engineering units
Raw_Data - the raw input data in the range of 0 - 9999
LO, HI - the data low and high scales in engineering units
When data conversion is necessary, the HI and LO scales, and data conversion method are indicated for
the corresponding registers.
Conversion Examples
1. Voltage readings
a) Assume device settings (690V input, direct wiring): PT ratio = 1.
Voltage engineering scales (see Note 1 to Table 5-1 ):
HI = Vmax = 828V
LO = 0V
If the raw data reading is 1449 then the voltage reading in engineering units will be as follows:
Volts reading = 1449 ×(828 - 0)/9999 + 0 = 120V
b) Assume device settings (wiring via PT): PT ratio = 14,400V : 120V = 120.
Voltage engineering scales:
HI = Vmax = 144 ×PT ratio = 144 ×120 = 17,280V

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LO = 0V
If the raw data reading is 8314 then the voltage reading in engineering units will be as follows:
Volts reading = 8314 ×(17,280 - 0)/9999 + 0 = 14,368V
2. Current readings
Assume device settings: CT primary current = 200A; current input overload = 150% (7.5A).
Current engineering scales:
HI = Imax = CT primary current ×1.5 = 200 ×1.5 = 300A
LO = 0A
If the raw data reading is 250 then the current reading in engineering units will be as follows:
Amps reading = 250 ×(300 - 0)/9999 + 0 = 7.5A
3. Power readings
a) Assume device settings (690V input, direct wiring): wiring configuration 4LN3; PT = 1; CT primary current = 200A.
Active Power engineering scales:
HI = Pmax = Vmax ×Imax ×3 = 828 ×(200 ×1.5) ×3 = 745,200W = 745.2kW
LO = -Pmax = -745.2kW
If the raw data reading is 5500 then the power reading in engineering units will be as follows:
Watts reading = 5500 ×(745.2 - (-745.2))/9999 + (-745.2) = 74.6kW
If the raw data reading is 500 then the power reading in engineering units will be as follows:
Watts reading = 500 ×(745.2 - (-745.2))/9999 + (-745.2) = -670.67kW
b) Assume device settings (wiring via PT): wiring configuration 4LL3; PT = 120; CT primary current = 200A.
Active Power engineering scales:
HI = Pmax = Vmax ×Imax ×2 = (144 ×120) ×(200.00 ×1.5) ×2/1000 = 10368kW
LO = -Pmax = -10368kW
If the raw data reading is 5500 then the power reading in engineering units will be as follows:
Watts reading = 5500 ×(10368 - (-10368))/9999 + (-10368) = 1037.9kW
If the raw data reading is 500 then the power reading in engineering units will be as follows:
Watts reading = 500 ×(10368 - (-10368))/9999 + (-10368) = -9331.1kW
4. Power Factor readings
Power factor engineering scales:
HI = 1.000.
LO = -1.000.
If the raw data reading is 8900 then the power factor in engineering units will be as follows:
Power factor reading = 8900 ×(1.000 - (-1.000))/9999 + (-1.000) = 0.78
Decimal Scaling
Decimal pre-scaling can be used to accommodate fractional numbers to an integer register format.
Fractional numbers pre-multiplied by 10 in power N, where N is the number of digits in the fractional part.
For example, the frequency reading of 50.01 Hz is transmitted as 5001, having been pre-multiplied by 100.
Whenever a data register contains a fractional number, the register measurement unit is given with a
multiplier ×0.1, ×0.01 or ×0.001, showing an actual register resolution (the weight of the least significant
decimal digit). To get an actual fractional number with specified precision, scale the register value with the
given multiplier. To write a fractional number into the register, divide the number by the given multiplier.

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4.2.2 32-bit Modulo 10000 Format
The short energy registers 287-294, and 301-302 are transmitted in two contiguous 16-bit registers in
modulo 10000 format. The first (low order) register contains the value mod 10000, and the second (high
order) register contains the value/10000. To get the true energy reading, the high order register value
should be multiplied by 10,000 and added to the low order register.
4.2.3 32-bit Long Integer Format
In a 32-bit long integer format, data is transmitted in two adjacent 16-bit Modbus registers as unsigned
(UINT32) or signed (INT32) long integer (whole) numbers. The first register contains the low-order word
(lower 16 bits) and the second register contains the high order word (higher 16 bits) of the 32-bit long
number. The low-order word always starts at an even Modbus address. The value range for unsigned data
is 0 to 4,294,967,295; for signed data the range is -2,147,483,648 to 2,147,483,647.
Negative values are transmitted in a two's complement code. This means that a negative value is added to
4,294,967,296, that is 2 to power 32.
Fractional numbers are premultiplied by 10 to power N, where N is the number of decimal places, and are
transmitted as whole numbers.
If your Modbus driver does not support a 32-bit long integer format, you can read the two 16-bit registers
separately, and then convert them into a 32-bit value as follows (using C notation):
32-bit value = (signed short)high_order_register ×65536L + (unsigned short)low_order_register
Examples
1. Unsigned 32-bit Values
If you read unsigned Voltage V1 of 69,000V from registers 13952-13953, then the register readings will be as follows:
(13952) = 3464
(13953) = 1
The 32-bit value is (1 x 65536 + 3464) = 69000V.
2. Signed 32-bit Values
If you read signed kW of -789kW from registers 14336-14337, then the register readings will be:
(14336) = 64747 (unsigned)
(14337) = 65535 (unsigned) or -1(signed value).
To take the high order register as a signed value, compare it with 32767. If the value is less or equal to 32767, use it as
is. If it is greater than 32767, then this is a negative number in a two's complement code (like in our example) - just
subtract it from 65536 to get the original negative value.
The 32-bit reading is (-1 x 65536 + 64747) = -789kW.
4.3 User Assignable Registers
The PM130EH contains the 120 user assignable registers in the address range of 0 to 119 (see Table 4-1),
any of which you can map to either register address accessible in the instrument. Registers that reside in
different locations may be accessed by a single request by re-mapping them to adjacent addresses in the
user assignable registers area.
The actual addresses of the assignable registers which are accessed via addresses 0 to 119 are specified
in the user assignable register map (see Table 4-2). This map occupies addresses from 120 to 239, where
map register 120 should contain the actual address of the register accessed via assignable register 0,
register 121 should contain the actual address of the register accessed via assignable register 1, and so
on. Note that the assignable register addresses and the map register addresses may not be re-mapped.
To build your own register map, write to map registers (120 to 239) the actual addresses you want to read
from or write to via the assignable area (0 to 119). Note that long word registers should always be aligned
at even addresses.For example, if you want to read registers 7136 (real-time voltage of phase A, word)
and 7576/7577 (kWh import, long word) via registers 0-2, then do the following:

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- write 7576 to register 120
- write 7577 to register 121
- write 7136 to register 122
Reading from registers 0-2 will return the kWh reading in registers 0 (low word) and 1 (high word), and the
voltage reading in register 2.
Table 4-1 User Assignable Registers
Address Register contents Type
0 Assigned register #0 INT16
1 Assigned register #1 INT16
2 Assigned register #2 INT16
… … …
119 Assigned register #119 INT16
Table 4-2 User Assignable Register Map
Address Register contents Type R/W Range
120 Mapped address for register #0 UINT16 R/W 256 to 65535
121 Mapped address for register #1 UINT16 R/W 256 to 65535
122 Mapped address for register #2 UINT16 R/W 256 to 65535
… … … … …
239 Mapped address for register #119 UINT16 R/W 256 to 65535

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5 POWERMETER REGISTERS DESCRIPTION
5.1 Basic Data Registers Set
Table 5-1 Basic Data Registers
Address Parameter Type R/W Unit Scale 1Con-
Low High version
256 Voltage L1/L12
5UINT16 R V 0 Vmax LIN3
257 Voltage L2/L23
5UINT16 R V 0 Vmax LIN3
258 Voltage L3/L31
5UINT16 R V 0 Vmax LIN3
259 Current L1 UINT16 R A 0 Imax LIN3
260 Current L2 UINT16 R A 0 Imax LIN3
261 Current L3 UINT16 R A 0 Imax LIN3
262 kW L1 UINT16 R kW -Pmax Pmax LIN3
263 kW L2 UINT16 R kW -Pmax Pmax LIN3
264 kW L3 UINT16 R kW -Pmax Pmax LIN3
265 kvar L1 UINT16 R kvar -Pmax Pmax LIN3
266 kvar L2 UINT16 R kvar -Pmax Pmax LIN3
267 kvar L3 UINT16 R kvar -Pmax Pmax LIN3
268 kVA L1 UINT16 R kVA -Pmax Pmax LIN3
269 kVA L2 UINT16 R kVA -Pmax Pmax LIN3
270 kVA L3 UINT16 R kVA -Pmax Pmax LIN3
271 Power factor L1 UINT16 R 0.001 -1.000 1.000 LIN3
272 Power factor L2 UINT16 R 0.001 -1.000 1.000 LIN3
273 Power factor L3 UINT16 R 0.001 -1.000 1.000 LIN3
274 Total power factor UINT16 R 0.001 -1.000 1.000 LIN3
275 Total kW UINT16 R kW -Pmax Pmax LIN3
276 Total kvar UINT16 R kvar -Pmax Pmax LIN3
277 Total kVA UINT16 R kVA -Pmax Pmax LIN3
278 Neutral current UINT16 R A 0 Imax LIN3
279 Frequency UINT16 R 0.01Hz 45.00 65.00 LIN3
280 Maximum sliding window kW demand 4UINT16 R/W kW -Pmax Pmax LIN3
281 Accumulated kW demand UINT16 R/W kW -Pmax Pmax LIN3
282 Maximum sliding window kVA demand 4UINT16 R/W kVA -Pmax Pmax LIN3
283 Accumulated kVA demand UINT16 R/W kVA -Pmax Pmax LIN3
284 Max. ampere demand L1 UINT16 R/W A 0 Imax LIN3
285 Max. ampere demand L2 UINT16 R/W A 0 Imax LIN3
286 Max. ampere demand L3 UINT16 R/W A 0 Imax LIN3
287 kWh import (low) UINT16 R/W kWh 0 9999 NONE
288 kWh import (high) UINT16 R/W 10,000 kWh 0 9999 x104
289 kWh export (low) UINT16 R/W kWh 0 9999 NONE
290 kWh export (high) UINT16 R/W 10,000 kWh 0 9999 x104
291 +kvarh net (low) 2UINT16 R/W kvarh 0 9999 NONE
292 +kvarh net (high) 2UINT16 R/W 10,000 kvarh 0 9999 x104
293 -kvarh net (low) 3UINT16 R/W kvarh 0 9999 NONE
294 -kvarh net (high) 3UINT16 R/W 10,000 kvarh 0 999 x104
295 Voltage THD L1/L12 6UINT16 R 0.1% 0 999.9 LIN3
296 Voltage THD L2/L23 6UINT16 R 0.1% 0 999.9 LIN3
297 Voltage THD L3 6UINT16 R 0.1% 0 999.9 LIN3
298 Current THD L1 UINT16 R 0.1% 0 999.9 LIN3
299 Current THD L2 UINT16 R 0.1% 0 999.9 LIN3
300 Current THD L3 UINT16 R 0.1% 0 999.9 LIN3
301 kVAh (low) UINT16 R/W kVAh 0 9999 NONE
302 kVAh (high) UINT16 R/W 10,000 kVAh 0 9999 x104
303 Present sliding window kW demand 4UINT16 R kW -Pmax Pmax LIN3
304 Present sliding window kVA demand 4UINT16 R kVA -Pmax Pmax LIN3
305 PF at maximum siding window kVA demand UINT16 R 0.001 -1.000 1.000 LIN3
306 Current TDD L1 UINT16 R 0.1% 0 100.0 LIN3
307 Current TDD L2 UINT16 R 0.1% 0 100.0 LIN3
308 Current TDD L3 UINT16 R 0.1% 0 100.0 LIN3

15
1The parameter limits are as follows:
Imax (x150% over-range) = 1.5 ×CT primary current [A]
Direct wiring (PT Ratio = 1):
Vmax (690 V input option) = 828 V
Vmax (120 V input option) = 144 V
Wiring via PTs (PT Ratio > 1):
Vmax (690 V input option) = 144 ×PT Ratio [V]
Vmax (120 V input option) = 144 ×PT Ratio [V]
Pmax = (Imax ×Vmax ×3)/1000 [kW] if wiring mode is 4LN3 or 3LN3
Pmax = (Imax ×Vmax ×2)/1000 [kW] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3 or 3LL3
2Positive readings of kvarh net
3Negative readings of kvarh net
4To get block interval demand readings, specify the number of demand periods equal to 1 (see Table 5-2)
5When the 4LN3 or 3LN3 wiring mode is selected, the voltages will be line-to-neutral; for any other wiring mode,
they will be line-to-line voltages.
6In the 4LN3, 4LL3, 3LN3, 3LL3 and 3DIR2 wiring modes, the harmonic voltages will represent line-to-neutral
voltages; in the 3OP2 and 3OP3 wiring modes, they will comprise L12 and L23 line-to-line voltages.
NOTE Writing a zero to one of registers 280-286 causes reset of all maximum demands. Writing a zero to
one of registers 287-294 and 301-302 causes reset of all accumulated energies.
5.2 Basic Setup
Table 5-2 Basic Setup Registers
Parameter Address Type R/W Range
Wiring mode 12304 UINT16 R/W 0 = 3OP2, 1 = 4LN3, 2 = 3DIR2, 3 = 4LL3, 4 = 3OP3, 5 =
3LN3, 6 = 3LL3
PT ratio 2305 UINT16 R/W 10 to 65000 ×0.1
CT primary current 2306 UINT16 R/W 1 to 10000 A
Power demand period 2307 UINT16 R/W 1,2,5,10,15,20,30,60 min, 255 = external synchronization 2
Volt/ampere demand period 2308 UINT16 R/W 0 to 1800 sec
Averaging buffer size 2309 UINT16 R/W 8, 16, 32
Reset enable/disable 2310 UINT16 R/W 0 = disable, 1 = enable
Reserved 2311 UINT16 R Read as 65535
The number of demand periods 2312 UINT16 R/W 1 to 15
Reserved 2313 UINT16 R Read as 65535
Reserved 2314 UINT16 R Read as 65535
Nominal frequency 2315 UINT16 R/W 50, 60 Hz
Maximum demand load current 2316 UINT16 R/W 0 to 10000 A (0 = CT primary current)
1The wiring mode options are as follows:
3OP2 - 3-wire open delta using 2 CTs (2 element)
4LN3 - 4-wire WYE using 3 PTs (3 element), line to neutral voltage readings
3DIR2 - 3-wire direct connection using 2 CTs (2 element)
4LL3 - 4-wire WYE using 3 PTs (3 element), line to line voltage readings
3OP3 - 3-wire open delta using 3 CTs (2 1/2 element)
3LN3 - 4-wire WYE using 2 PTs (2 1/2 element), line to neutral voltage readings
3LL3 - 4-wire WYE using 2 PTs (2 1/2 element), line to line voltage readings
2Synchronization of power demand interval can be made through communications using the synchronize power
demand interval command (see Table 5-5)

16
5.3 User Selectable Options Setup
Table 5-3 User Selectable Options Registers
Parameter Address Type R/W Range
Power calculation mode 2376 UINT16 R/W 0 = using reactive power,
1 = using non-active power
Energy roll value 12377 UINT16 R/W
0 = 1×104
1 = 1×105
2 = 1×106
3 = 1×107
4 = 1×108
Phase energy calculation mode 2378 UINT16 R/W 0 = disable, 1 = enable
1For short energy registers (see Table 5-1), the maximum roll value will be 1×108 for positive readings and 1×107for
negative readings.
5.4 Communications Setup
Table 5-4 Communications Setup Registers
Parameter Address Type R/W Range
Reserved 2344 UINT16 R Read as 65535
Interface 2345 UINT16 R/W 2 = RS-485 (not changeable)
Address 2346 UINT16 R/W 1 to 247
Baud rate 2347 UINT16 R/W 0 = 110 bps
1 = 300 bps
2 = 600 bps
3 = 1200 bps
4 = 2400 bps
5 = 4800 bps
6 = 9600 bps
7 = 19200 bps
Data format 2348 UINT16 R/W 1 = 8 bits/no parity
2 = 8 bits/even parity
When changing the instrument address, baud rate or data format, the new communications parameters will
take effect 100 ms after the instrument responds to the master’s request.
5.5 Reset/Synchronization Registers
Table 5-5 Reset/Synchronization Registers
Register function Address Type R/W Reset value
Clear total energy registers 3404 UINT16 W 0
Clear total maximum demand registers 3405 UINT16 W 0 = all maximum demands
1 = power demands
2 = volt/ampere demands
Reserved 3406-3407 UINT16
Clear event/time counters 3408 UINT16 W 0 = all counters
1-4 = counter #1 - #4
Clear Min/Max log 3409 UINT16 W 0
Reserved 3410-3419 UINT16
Synchronize power demand interval 13420 UINT16 W 0
11) If the power demand period is set to External Synchronization (see Table 5-2), writing a zero to this location will
simulate an external synchronization pulse denoting the start of the next demand interval. The synchronization requests
should not follow in intervals of less than 30 seconds, or the request will be rejected.
2) If the power demand period is specified in minutes, writing a zero to this location provides synchronization of the
instrument’s internal timer with the time of reception of the master’s request. If the time expired from the beginning of
the current demand interval is more than 30 seconds, the new demand interval starts immediately, otherwise
synchronization is delayed until the next demand interval.

17
5.6 Instrument Status
Table 5-6 Instrument Status Registers
Parameter Address Type R/W Range
Instrument reset register 12560 UINT16 R/W 0 (when read)
65535 (when written) = reset the
instrument
Reserved 2561 UINT16 R Read as 0
Relay status 2562 UINT16 R see Table 5-7
Reserved 2563 UINT16 R Read as 0
Reserved 2564 UINT16 R
Firmware version number 2565 UINT16 R 0-65535
Instrument options 1 2566 UINT16 R See Table 5-8
Instrument options 2 2567 UINT16 R See Table 5-8
1Writing a value of 65535 into register 2560 will cause the instrument to perform a warm restart.
Table 5-7 Relay Status
Bit number Description
0-6 Not used (permanently set to 1)
7 Relay status
8-15 Not used (permanently set to 0)
Bit meaning: 0 = relay operated, 1 = relay released
Table 5-8 Instrument Options
Options register Bit Description
Options1 0 120V option
1 690V option
2-4 Reserved
5 150% current over-range
6-8 Reserved
9 Relays option
10-15 Reserved
Options 2 0-2 Number of relays - 1
3-15 Reserved
5.7 Extended Status
Table 5-9 Extended Status Registers
Register description Address Type R/W Value range
Relay status 3452 UINT16 R See Table 5-10
Reserved 3453- UINT16 R Read as 0
3454 UINT16
Setpoints status 3455 UINT16 R See Table 5-11
Log status 3456 UINT16 R See Table 5-12
Reserved 3457-3473 UINT16 R Read as 0
Setpoint alarm status 3474 UINT16 R/W See Table 5-13
Self-check alarm status 3475 UINT16 R/W See Table 5-14
Table 5-10 Relay Status
Bit Description
0 Relay status
1-15 Not used (permanently set to 0)
Bit meaning: 0 = relay released, 1 = relay operated

18
Table 5-11 Setpoints Status
Bit Description
0 Setpoint # 1 status
1 Setpoint # 2 status
2 Setpoint # 3 status
3 Setpoint # 4 status
4 Setpoint # 5 status
5 Setpoint # 6 status
6 Setpoint # 7 status
7 Setpoint # 8 status
8 Setpoint # 9 status
9 Setpoint # 10 status
10 Setpoint # 11 status
11 Setpoint # 12 status
12 Setpoint # 13 status
13 Setpoint # 14 status
14 Setpoint # 15 status
15 Setpoint # 16 status
Bit meaning: 0 = setpoint is released, 1 = setpoint is operated
Table 5-12 Log Status
Bit Description
0 Reserved
1 New Min/Max Log
2-15 Not used (permanently set to 0)
Bit meaning: 0 = no new logs, 1 = new log recorded (the new log flag is reset when the user reads the first log record
after the flag has been set)
Table 5-13 Setpoint Alarm Status
Bit Description
0 Alarm #1
1 Alarm #2
2 Alarm #3
3 Alarm #4
4 Alarm #5
5 Alarm #6
6 Alarm #7
7 Alarm #8
8 Alarm #9
9 Alarm #10
10 Alarm #11
11 Alarm #12
12 Alarm #13
13 Alarm #14
14 Alarm #15
15 Alarm #16
Bit meaning: 1 = setpoint has been operated
The setpoint alarm register stores the status of the operated setpoints by setting the appropriate bits to 1.
The alarm status bits can be reset all together by writing zero to the setpoint alarm register. It is possible to
reset each alarm status bit separately by writing back the contents of the alarm register with a
corresponding alarm bit set to 0.
Table 5-14 Self-check Alarm Status
Bit Description
0 Reserved
1 ROM error
2 RAM error

19
Bit Description
3 Watchdog timer reset
4 Sampling failure
5 Out of control trap
6 Reserved
7 Timing failure
8 Loss of power (power up)
9 External reset (warm restart)
10 Configuration corrupted
11-15 Reserved
The self-check alarm register indicates possible problems with the instrument hardware or setup
configuration. The hardware problems are indicated by the appropriate bits which are set whenever the
instrument fails self-test diagnostics or in the event of loss of power. The setup configuration problems are
indicated by the dedicated bit which is set when either configuration register is corrupted. In this event, the
instrument will use the default configuration. The configuration corrupt bit may also be set as a result of the
legal changes in the setup configuration since the instrument might implicitly change or clear other setups if
they are affected by the changes made.
Hardware fault bits can be reset by writing zero to the self-check alarm register. The configuration corrupt
status bit is also reset automatically when you change setup either via the front panel or through
communications.
5.8 Extended Data Registers
The following table lists all registers containing the data measured by the instrument. Notice that these
registers are arranged into groups which are not located at adjacent addresses. You can re-map these
registers into adjacent addresses to access multiple data from different data groups by using a single
request. Refer to Section 2.9 for information on the user assignable registers.
Along with the register address, the table shows for each data item its point identifier (ID). This is a one
word containing a data group ID in the high byte and the parameter offset in a group in the low byte. Point
IDs are used to specify input or output parameters whenever a data parameter specification is needed, for
example, when selecting analog output parameters or reading Min/Max log records.
Table 5-15 Extended Data Registers
Parameter 16-bit Register 32-bit Point R/W Unit Range/Scale 1
Reg. Cnv. Register ID Low High
None
None 6656 11776-11777 0x0000 R 0 0
Relays
Relay status (see Table 5-10) 6976 12800-12801 0x0800 R 0 3
Event/time counters
Counter #1 7056-
7057
13056-13057 0x0A00 R/W 0 99999
Counter #2 7058-
7059
13058-13059 0x0A01 R/W 0 99999
Counter #3 7060-
7061
13060-13061 0x0A02 R/W 0 99999
Counter #4 7062-
7063
13062-13063 0x0A03 R/W 0 99999
Real-time values per phase
Voltage L1/L12 57136 LIN3 13312-13313 0x0C00 R V 0 Vmax
Voltage L2/L23 57137 LIN3 13314-13315 0x0C01 R V 0 Vmax
Voltage L3/L31 57138 LIN3 13316-13317 0x0C02 R V 0 Vmax
Current L1 7139 LIN3 13318-13319 0x0C03 R A 0 Imax
Current L2 7140 LIN3 13320-13321 0x0C04 R A 0 Imax
Current L3 7141 LIN3 13322-13323 0x0C05 R A 0 Imax
kW L1 7142 LIN3 13324-13325 0x0C06 R kW -Pmax Pmax
kW L2 7143 LIN3 13326-13327 0x0C07 R kW -Pmax Pmax
kW L3 7144 LIN3 13328-13329 0x0C08 R kW -Pmax Pmax

20
Parameter 16-bit Register 32-bit Point R/W Unit Range/Scale 1
Reg. Cnv. Register ID Low High
kvar L1 7145 LIN3 13330-13331 0x0C09 R kvar -Pmax Pmax
kvar L2 7146 LIN3 13332-13333 0x0C0A R kvar -Pmax Pmax
kvar L3 7147 LIN3 13334-13335 0x0C0B R kvar -Pmax Pmax
kVA L1 7148 LIN3 13336-13337 0x0C0C R kVA 0 Pmax
kVA L2 7149 LIN3 13338-13339 0x0C0D R kVA 0 Pmax
kVA L3 7150 LIN3 13340-13341 0x0C0E R kVA 0 Pmax
Power factor L1 7151 LIN3 13342-13343 0x0C0F R 0.001 -1.000 1.000
Power factor L2 7152 LIN3 13344-13345 0x0C10 R 0.001 -1.000 1.000
Power factor L3 7153 LIN3 13346-13347 0x0C11 R 0.001 -1.000 1.000
Voltage THD L1/L12 67154 LIN3 13348-13349 0x0C12 R 0.1% 0 999.9
Voltage THD L2/L23 67155 LIN3 13350-13351 0x0C13 R 0.1% 0 999.9
Voltage THD L3 67156 LIN3 13352-13353 0x0C14 R 0.1% 0 999.9
Current THD L1 7157 LIN3 13354-13355 0x0C15 R 0.1% 0 999.9
Current THD L2 7158 LIN3 13356-13357 0x0C16 R 0.1% 0 999.9
Current THD L3 7159 LIN3 13358-13359 0x0C17 R 0.1% 0 999.9
K-Factor L1 7160 LIN3 13360-13361 0x0C18 R 0.1 1.0 999.9
K-Factor L2 7161 LIN3 13362-13363 0x0C19 R 0.1 1.0 999.9
K-Factor L3 7162 LIN3 13364-13365 0x0C1A R 0.1 1.0 999.9
Current TDD L1 7163 LIN3 13366-13367 0x0C1B R 0.1% 0 100.0
Current TDD L2 7164 LIN3 13368-13369 0x0C1C R 0.1% 0 100.0
Current TDD L3 7165 LIN3 13370-13371 0x0C1D R 0.1% 0 100.0
Voltage L12 7166 LIN3 13372-13373 0x0C1E R V 0 Vmax
Voltage L23 7167 LIN3 13374-13375 0x0C1F R V 0 Vmax
Voltage L31 7168 LIN3 13376-13377 0x0C20 R V 0 Vmax
Real-time total values
Total kW 7256 LIN3 13696-13697 0x0F00 R kW -Pmax Pmax
Total kvar 7257 LIN3 13698-13699 0x0F01 R kvar -Pmax Pmax
Total kVA 7258 LIN3 13700-13701 0x0F02 R kVA 0 Pmax
Total PF 7259 LIN3 13702-13703 0x0F03 R 0.001 -1.000 1.000
Real-time auxiliary values
Reserved 7296 13824-13825 0x1000 R 0 0
Neutral current 7297 LIN3 13826-13827 0x1001 R A 0 Imax
Frequency 7298 LIN3 13828-13829 0x1002 R 0.01Hz 0 100.00 2
Voltage unbalance 7299 LIN3 13830-13831 0x1003 R 1% 0 300
Current unbalance 7300 LIN3 13832-13833 0x1004 R 1% 0 300
Phasors 7
Voltage L1/L12 7316 LIN3 13864-13865 0x1080 R V 0 Vmax
Voltage L2/L23 7317 LIN3 13866-13867 0x1081 R V 0 Vmax
Voltage L3/L31 7318 LIN3 13868-13869 0x1082 R V 0 Vmax
Reserved 7319 LIN3 13870-13871 0x1083 R V 0 Vmax
Current L1 7320 LIN3 13872-13873 0x1084 R A 0 Imax
Current L2 7321 LIN3 13874-13875 0x1085 R A 0 Imax
Current L3 7322 LIN3 13876-13877 0x1086 R A 0 Imax
Reserved 7323 LIN3 13878-13879 0x1087 R A 0 Imax
V1/V12 Voltage angle 7324 LIN3 13880-13881 0x1088 R 0.1º -180.0 180.0
V2/V23 Voltage angle 7325 LIN3 13882-13883 0x1089 R 0.1º -180.0 180.0
V3/V31 Voltage angle 7326 LIN3 13884-13885 0x108A R 0.1º -180.0 180.0
Reserved 7327 LIN3 13886-13887 0x108B R -180.0 180.0
I1 Current angle 7328 LIN3 13888-13889 0x108C R 0.1º -180.0 180.0
I2 Current angle 7329 LIN3 13890-13891 0x108D R 0.1º -180.0 180.0
I3 Current angle 7330 LIN3 13892-13893 0x108E R 0.1º -180.0 180.0
Reserved 7331 LIN3 13894-13895 0x108F R -180.0 180.0
Average values per phase
Voltage L1/L12 57336 LIN3 13952-13953 0x1100 R V 0 Vmax
Voltage L2/L23 57337 LIN3 13954-13955 0x1101 R V 0 Vmax
Voltage L3/L31 57338 LIN3 13956-13957 0x1102 R V 0 Vmax
Current L1 7339 LIN3 13958-13959 0x1103 R A 0 Imax
Current L2 7340 LIN3 13960-13961 0x1104 R A 0 Imax
Current L3 7341 LIN3 13962-13963 0x1105 R A 0 Imax
kW L1 7342 LIN3 13964-13965 0x1106 R kW -Pmax Pmax