REDZ LKM Series User manual

LKM Series MODBUS RTU to IEC62056-21LKM Series MODBUS RTU to IEC62056-21
Protocol Meter Gateway User ManualProtocol Meter Gateway User Manual
1. About LKM Series MODBUS RTU to IEC62056-21 Protocol Meter1. About LKM Series MODBUS RTU to IEC62056-21 Protocol Meter
GatewayGateway
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway are designed to be used with electricity meters that
communicate in IEC62056-21 standard. The meters that support IEC62056-21 standard has read out tables that has
several data such as import energy, export energy, phase voltages and currents. LKM Series Modbus RTU to
IEC62056-21 Protocol Gateway automatically reads those values and maps to Modbus registers. Field devices or
software systems can easily read data over Modbus RTU protocol so that energy meter reading can easily be
integrated to field automation or monitoring systems without need of IEC6056-21 protocol implementation.
LKM series can read meters with auto baud changes or fixed baud rates and supports up to 10 meters on RS485 bus.
LKM614 is especially designed for EMH LZQJ-XC meters and it is direct replacement for Variomod XC modules.
2. Hardware Features2. Hardware Features
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway has 2-way communication. One side connected directly
or via optical probe to read electricity meter with IEC62056-21 protocol, other side can be connected to a field
device such as PLC or RTU or serial device server connected to an automation software system that can read
Modbus RTU devices.
There are standalone versions and also plug and play version for EMH LZQJ-XC meters.
2.1 Features – Standalone Version2.1 Features – Standalone Version
Auto reads Electricity meters that communicates in IEC62056-21 standard and maps in predefined MODBUS
register table
Supports Up to 10 meters reading on RS485 Bus
User defined initialization string can be sent before IEC62056-21 Mode C reading
Configurable Modbus address via Modbus Commands
Configurable Reading Period on IEC6056-21 side via Modbus Commands

Configurable Reading Table Number on IEC6056-21 side via Modbus Commands
Wide range power input: 3,3V – 28V DC
Wide operating temperature range from -40 to 85 °C
Very Small form factor, only 2.1 x 4.2 x 4.4cm
ABS, IP40 housing
Customization of reading process and register tables based on client request
Firmware upgradable over serial line
2.2 Features – Plug and Play Version2.2 Features – Plug and Play Version
Especially plug and play designed for EMH LXQJ-XC meters
Direct replacement for Variomod XC modules for EMH meters
Auto reads EMH meters and maps values in predefined MODBUS register table
Configurable Modbus address via Modbus Commands
Configurable Reading Period on IEC6056-21 side via Modbus Commands
Configurable Reading Table Number on IEC6056-21 side via Modbus Commands
Gets power directly from meter
Serial interface directly connected to meter ( with 15kV ESD protection)
Wide operating temperature range from -40 to 85 °C
Customization of reading process and register tables based on client request
Firmware upgradable over serial line
3. Installation3. Installation
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway has very small form factor.
Standalone versions are only 2.1 x 4.2 x 4.4cm. Thus, it can be acted as part of cable and no need special mounting.
Simply connect cables and use as a part of cable.
Plug and Play version can directly fit into EMH LZQJ-XC meter. It is direct replacement for Variomod XC modules.
Simply plug in LKM614 into meter.

4. Panel Descriptions and Pin Mappings4. Panel Descriptions and Pin Mappings
4.1 Modem Side: LKM1414.1 Modem Side: LKM141
1. DB9 Male connector for RS232: Only Tx-Rx-GND for data transmission.
Pin NumberPin Number DescriptionDescription
1 Not Used
2 Rx
3 Tx
4 Not Used
5 GND
6 Not Used
7 Not Used
8 Not Used
9 Not Used
4.2 Modem Side: LKM1444.2 Modem Side: LKM144
1. Terminal Connector for 2 wire RS485 connection and GND.
Pin NumberPin Number DescriptionDescription

1 GND
2 A
3 B
4.3 Modem Side: LKM6144.3 Modem Side: LKM614
1. Operation Mode Selection Switch
PinPin
Positions (1-Positions (1-
2)2)
LEDLED
StatusStatus
Modem SideModem Side
CommunicationCommunication
Data TypeData Type
Meter SideMeter Side
CommunicationCommunication
OFF-OFF Mode 1
LED ON 19200 8N1
Starts with
300 baud rate
and changes
during
transmission to
target baud
rate based on
IEC62056-21
protocol
ON-OFF Mode 2
LED ON 9600 8N1
Starts with
300 baud rate
and changes
during
transmission to
target baud
rate based on
IEC62056-21
protocol
OFF-ON Mode 3
LED ON 19200 8N1 19200 7E1 Fixed
ON-ON Mode 4
LED ON 9600 8N1 9600 7E1 Fixed
NOTE:NOTE: After changing operating mode of device, device must be repowered
to apply new setting. Which means device must be plugged out of the
device and plugged in back again.
2. Terminal Connector for 2 wire RS485 connection and GND.

Pin NumberPin Number DescriptionDescription
1 A
2 B
3 GND
4.4 Meter Side: LKM141 & LKM1444.4 Meter Side: LKM141 & LKM144
1. Terminal Connector for 2 wire RS485 connection and GND. Terminal also has external power input pins.
Pin NumberPin Number DescriptionDescription
1
Input Power +
(3,3V - 28V DC)
2
Input Power -
GND
3 GND
4 A
5 B
NOTE:NOTE: Power Input has polarity protection. Yet again please check polarity
when connecting multiple devices in same power source, otherwise device
may burn due to worng connection of power.
4.5 Other Side: LKM1414.5 Other Side: LKM141

1. Operation Mode Selection Switch
Pin Positions (1-Pin Positions (1-
2)2) LED StatusLED Status
Modem SideModem Side
CommunicationCommunication
Data TypeData Type
Meter SideMeter Side
CommunicationCommunication
OFF-OFF Mode 1 LED ON 19200 8N1
Starts with 300
baud rate and
changes during
transmission to
target baud rate
based on
IEC62056-21
protocol
OFF-ON Mode 2 LED ON 9600 8N1
Starts with 300
baud rate and
changes during
transmission to
target baud rate
based on
IEC62056-21
protocol
ON-OFF Mode 3 LED ON 19200 8N1 19200 7E1 Fixed
ON-ON Mode 4 LED ON 9600 8N1 9600 7E1 Fixed
NOTE:NOTE: After changing operating mode of device, device must be repowered
to apply new setting.
2. Power ON/OFF Switch
Switch PositionSwitch Position DescriptionDescription
1 Power Off Device
2 Power On Device
4.6 Other Side: LKM1444.6 Other Side: LKM144

1. Operation Mode Selection Switch
Pin Positions (1-2)Pin Positions (1-2) LED StatusLED Status Modem SideModem Side
Communication Data TypeCommunication Data Type Meter Side CommunicationMeter Side Communication
OFF-OFF Mode 1 LED ON 19200 8N1
Starts with 300 baud rate
and changes during
transmission to target baud
rate based on IEC62056-21
protocol
ON-OFF Mode 2 LED ON 9600 8N1
Starts with 300 baud rate
and changes during
transmission to target baud
rate based on IEC62056-21
protocol
OFF-ON Mode 3 LED ON 19200 8N1 19200 7E1 Fixed
ON-ON Mode 4 LED ON 9600 8N1 9600 7E1 Fixed
NOTE:NOTE: After changing operating mode of device, device must be repowered
to apply new setting.

4.7 Top Side: LKM141 & LKM1444.7 Top Side: LKM141 & LKM144
LED NumberLED Number DescriptionDescription
1 Mode 1 LED
2 Mode 2 LED
3 Mode 3 LED
4 Mode 4 LED
5 System LED: Blinks every second
6Tx LED: Sending data from Modem Side
to Meter Side
7Rx LED: Receiving data from Meter Side
to Modem Side
4.8 Top Side: LKM6144.8 Top Side: LKM614
LED Number Description
1 Mode 4 LED

2 Mode 3 LED
3 Mode 2 LED
4 Mode 1 LED
5 System LED: Blinks every second
6Rx LED: Receiving data from
Meter
7 Tx LED: Sending data to Meter
5. Usage Scenarios and Connection Diagrams5. Usage Scenarios and Connection Diagrams
LKM Series Modbus RTU to IEC62056-21 Protocol Gateways can be used in different scenarios. Usages are not
limited to that examples and user may create their own usage scenario.
LKM Series Modbus RTU to IEC62056-21 Protocol Gateways standalone versions support up to 10 meters reading on
RS485 Bus.
5.1 LKM Connected to Meter via Direct Cable and to Remote Server over TCP/IP5.1 LKM Connected to Meter via Direct Cable and to Remote Server over TCP/IP
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway can be connected to RS485 serial line of meter and can
operate in fixed baud rate mode. Other side of device can be connected to remote Data Acquisition Server via
TCP/IP device that can convert Modbus TCP to Modbus RTU.
5.2 LKM Connected to Meter via Optical Probe and to Remote Server over TCP/IP5.2 LKM Connected to Meter via Optical Probe and to Remote Server over TCP/IP
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway can be connected to optical probe of meter via REDZ
KMK series optical probes and can operate in changing baud rate mode. Other side of device can be connected to
remote Data Acquisition Server via TCP/IP device that can convert Modbus TCP to Modbus RTU.

5.3 LKM Connected to Meter via Direct Cable and to Remote Server over Direct Cable5.3 LKM Connected to Meter via Direct Cable and to Remote Server over Direct Cable
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway can be connected to RS485 serial line of meter and can
operate in fixed baud rate mode. Other side of device can be connected to Data Acquisition Server via Cable
connection as well and server can read data with Modbus RTU protocol.
5.4 LKM Connected to Meter via Direct Cable and to Remote Server over Field Device5.4 LKM Connected to Meter via Direct Cable and to Remote Server over Field Device
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway can be connected to RS485 serial line of meter and can
operate in fixed baud rate mode. Other side of device can be connected to a field device such as PLC or RTU and
that device can read data with Modbus RTU protocol.

5.5 LKM614 Connected Directly to EMH LZQJ-XC Meter5.5 LKM614 Connected Directly to EMH LZQJ-XC Meter
LKM614 Modbus RTU to IEC62056-21 Protocol Gateway is especially designed for EMH LZQJ-XC meters and it is
direct replacement for Variomod XC modules. LKM614 can be connected to EMH LZQJ-SC meter in fixed baud rate
or auto baud rate mode based on meter settings. Other side of device can be connected to a field device such as
PLC or RTU and that device can read data with Modbus RTU protocol. That Device can also be connected to REDZ
CKL series Modbus TCP – RTU Converter to read Modbus values over LAN or WAN.
6. IEC62056-21 and MODBUS Definitions6. IEC62056-21 and MODBUS Definitions
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway’s one side should be connected directly or via optical
probe to read electricity meter with IEC62056-21 protocol and other side should be connected to a field device such
as PLC or RTU or serial device server connected to an automation software system that can read Modbus RTU
devices.
6.1 Modbus Data Registers Table: Version 16.1 Modbus Data Registers Table: Version 1
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway reads the data table of IEC62056-21 meter and maps the
data in following Modbus Registers:
RegisterRegister
NumberNumber
OBISOBIS
CodeCode
SearchSearch
StringString
RegisterRegister
NameName
ModbusModbus
AddressAddress
(Dec)(Dec)
ModbusModbus
AddressAddress
(Hex)(Hex)
DataData
TypeType
1 0.9.1 “0.9.1” Time 1 0x01
Unsigned
Long
(UInt32)
2 0.9.2 “0.9.2” Date 3 0x03
Unsigned
Long

(UInt32)
3 1.8.0 "1.8.0"
Total active
energy import
A+
5 0x05
Unsigned
Long
(UInt32)
4 2.8.0 "2.8.0"
Total active
energy export
A-
7 0x07
Unsigned
Long
(UInt32)
5 3.8.0 "3.8.0"
Total
reactive
energy R+
9 0x09
Unsigned
Long
(UInt32)
6 4.8.0 "4.8.0"
Total
reactive
energy R-
11 0x0B
Unsigned
Long
(UInt32)
7 5.8.0 "5.8.0"
Total
reactive
inductive
energy import
(Ri+) Q1
13 0x0D
Unsigned
Long
(UInt32)
8 6.8.0 "6.8.0"
Total
reactive
capacitive
energy import
(Rc+) Q2
15 0x0F
Unsigned
Long
(UInt32)
9 7.8.0 "7.8.0"
Total
reactive
inductive
energy export
(Ri-) Q3
17 0x11
Unsigned
Long
(UInt32)
10 8.8.0 "8.8.0"
Total
reactive
capacitive
energy export
(Rc-) Q4
19 0x13
Unsigned
Long
(UInt32)
11 1.6.0 "1.6.0"
Total
maximal
average
import power
P+max
21 0x15
Unsigned
Long
(UInt32)
12 2.6.0 "2.6.0"
Total
maximal
average
exportpower
P-max
23 0x17
Unsigned
Long
(UInt32)
13 1.5.0 "1.5.0"
Total
average
import power
P+max (last
period value)
25 0x19
Unsigned
Long
(UInt32)
14 1.7.0 "1.7.0"
Total
instantaneous
value power
P+
27 0x1B
Unsigned
Long
(UInt32)
15 31.7 “31.7”
L1 Current ;
instantaneous
value
29 0x1D
Unsigned
Long
(UInt32)
16 51.7 “51.7”
L2 Current ;
instantaneous
value
31 0x1F
Unsigned
Long
(UInt32)
17 71.7 “71.7”
L3 Current ;
instantaneous
value
33 0x21
Unsigned
Long
(UInt32)
18 32.7 “32.7”
L1 Voltage;
instantaneous
value
35 0x23
Unsigned
Long
(UInt32)

19 52.7 “52.7” L2 Voltage;
instantaneous
value
37 0x25 Unsigned
Long
(UInt32)
20 72.7 “72.7”
L3 Voltage;
instantaneous
value
39 0x27
Unsigned
Long
(UInt32)
21 13.7 “13.7” Power
factor 41 0x29
Unsigned
Long
(UInt32)
22 14.7 “14.7” Frequency 43 0x2B
Unsigned
Long
(UInt32)
23 C.1.0 “C.1.0”
Meter
number /
meter ID
45 0x2D
Unsigned
Long
(UInt32)
24 C.7.0 “C.7.0”
Event power
down -
counter
47 0x2F
Unsigned
Long
(UInt32)
The search strings are defined in firmware of device and can be customized based on customer’s project. LKM Series
Modbus RTU to IEC62056-21 Protocol Gateway reads the read-out table (table number can be configured by user
with Modbus command. See relevant section to configure) of IEC62056-21 meter and searches the strings and maps
the values of first occurrence to Modbus register address. If the data is unavailable LKM Series Modbus RTU to
IEC62056-21 Protocol Gateway stores zero “0”.

6.2 Modbus Data Registers Table: Version 26.2 Modbus Data Registers Table: Version 2
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway alternatively reads the data table of IEC62056-21 meter
and maps the data in following Modbus Registers:
NOTE:NOTE: Alternatives of that table are available based on client request.
RegisterRegister
NumberNumber
OBISOBIS
CodeCode
SearchSearch
StringString Register NameRegister Name ModbusModbus Address (Dec)Address (Dec)
Modbus AddressModbus Address
(Hex)(Hex) Data TypeData Type
1 0.9.1 “0.9.1” Time 1 0x01 Unsigned Long
(UInt32)
2 0.9.2 “0.9.2” Date 3 0x03 Unsigned Long
(UInt32)
3 1.8.0 "1.8.0" Total active
energy import A+ 5 0x05 Unsigned Long (UInt32)
4 2.8.0 "2.8.0" Total active
energy export A- 7 0x07 Unsigned Long (UInt32)
5 3.8.0 "3.8.0" Total reactive
energy R+ 9 0x09 Unsigned Long (UInt32)
6 4.8.0 "4.8.0" Total reactive
energy R- 11 0x0B Unsigned Long (UInt32)
7 5.8.0 "5.8.0"
Total reactive
inductive energy
import (Ri+) Q1
13 0x0D Unsigned Long
(UInt32)
8 6.8.0 "6.8.0"
Total reactive
capacitive energy
import (Rc+) Q2
15 0x0F Unsigned Long
(UInt32)
9 7.8.0 "7.8.0"
Total reactive
inductive energy
export (Ri-) Q3
17 0x11 Unsigned Long
(UInt32)
10 8.8.0 "8.8.0"
Total reactive
capacitive energy
export (Rc-) Q4
19 0x13 Unsigned Long
(UInt32)
11 1.6.0 "1.6.0"
Total maximal
average import
power P+max
21 0x15 Unsigned Long
(UInt32)
12 2.6.0 "2.6.0"
Total maximal
average
exportpower P-
max
23 0x17 Unsigned Long
(UInt32)
13 1.25 "1.25"
Total Active
import power P+ ;
instantaneous
value
25 0x19 Unsigned Long
(UInt32)
14 2.25 "2.25"
Total Active
export power P- ;
instantaneous
value
27 0x1B Unsigned Long
(UInt32)
15 31.25 "31.25"
L1 Active import
power P+ ;
instantaneous 29 0x1D Unsigned Long (UInt32)

value
16 51.25 "51.25"
L2 Active import
power P+;
instantaneous
value
31 0x1F Unsigned Long
(UInt32)
17 71.25 "71.25"
L3 Active import
power P+;
instantaneous
value
33 0x21 Unsigned Long
(UInt32)
18 32.25 "32.25"
L1 Active export
power P-;
instantaneous
value
35 0x23 Unsigned Long
(UInt32)
19 52.25 "52.25"
L2 Active export
power P-;
instantaneous
value
37 0x25 Unsigned Long
(UInt32)
20 72.25 "72.25"
L3 Active export
power P-;
instantaneous
value
39 0x27 Unsigned Long
(UInt32)
21 13.25 "13.25" Power factor 41 0x29 Unsigned Long
(UInt32)
22 14.25 "14.25" Frequency 43 0x2B Unsigned Long
(UInt32)
23 C.86.0 "C.86.0" Error Code 45 0x2D Unsigned Long
(UInt32)
24 C.86.1 "C.86.1" Meter number /
meter ID 47 0x2f Unsigned Long (UInt32)
The search strings are defined in firmware of device and can be customized based on customer’s project. LKM Series
Modbus RTU to IEC62056-21 Protocol Gateway reads the read-out table (table number can be configured by user
with Modbus command. See relevant section to configure) of IEC62056-21 meter and searches the strings and maps
the values of first occurrence to Modbus register address. If the data is unavailable LKM Series Modbus RTU to
IEC62056-21 Protocol Gateway stores zero “0”.
NOTE:NOTE: LKM Standalone version can read up to 10 meters in RS485 bus.
Search strings will be same for all meters in same bus.
6.3 Modbus Data Registers Table: Version 36.3 Modbus Data Registers Table: Version 3
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway can have any different combination of OBIS value list.
Just contact our company for update on obis codes and your version of list will be shared as a firmware file in few
hours. That firmware can be uploaded to the device in an instant.
6.4 Modbus Data Registers Table: Reading with Modbus Commands6.4 Modbus Data Registers Table: Reading with Modbus Commands
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway meter data can be read by Holding Register command
(Function Code 3). Values can be queried individually or as array.
Read Holding Registers (Function Code=3)Read Holding Registers (Function Code=3)

RequestRequest
This command is requesting the content of meter data holding registers # 40006 to 40013 from the LKM Series
Modbus RTU to IEC62056-21 Protocol Gateway with address 1.
01 03 0005 0008 540D01 03 0005 0008 540D
01: 01: The Slave Address (01 hex = address 1 )
03: 03: The Function Code 3 (read IEC62056-21 read-out mapped data)
0005: 0005: The Data Address of the first register requested.
(0005 hex = 5 , + 40001 offset = input #40006 )
NOTE:NOTE: This example shows reading of 1 meter in RS485 bus. If there are more
then 1 meter in bus ( LKM can read up to 10 meters in same RS485 bus) then
address will be simply incremented by decimal 256
same data addresse example for other meters:
2nd meter : 0105
3th meter : 0205
....
10th meter: 0905
All meters can be read by field Modbus RTU master device simultaneoulsy by
different registers.
0008:0008: The total number of registers requested. (read 8 registers for 4 values since each value is 32byte, 40005 to
40013)
540D: 540D: The CRC (cyclic redundancy check) for error checking.
ResponseResponse
01 03 10 0000 0000 0000 0000 0000 0000 0000 0000 E45901 03 10 0000 0000 0000 0000 0000 0000 0000 0000 E459
01: 01: The Slave Address (01 hex = address 1)
03:03: The Function Code 3 (read IEC62056-21 read-out mapped data)
10:10: The number of data bytes to follow (4 registers x 4 bytes each = 16 bytes)
0000 0000: 0000 0000: The contents of register #40006
0000 0000:0000 0000: The contents of register #40008
0000 0000:0000 0000: The contents of register #40010
0000 0000:0000 0000: The contents of register #40012
E19A: E19A: The CRC (cyclic redundancy check).
Example 1Example 1

if read-out data has following line
1-1:1.8.0(000000.03*MWh)1-1:1.8.0(000000.03*MWh)
Read out value is stored at address 0x05 as per Modbus Address Table:
1.8.0 "1.8.0"
Total
active
energy
import A+
5 0x05
Unsigned
Long
(UInt32)
The read data will be “3” and user should implement the coefficient to show value properly with or without comma.
Example 2Example 2
if read-out data has following line
5.8.0(17.244*MVarh)5.8.0(17.244*MVarh)
Read out value is stored at address 0x0D as per Modbus Address Table:
5.8.0 "5.8.0"
Total
reactive
inductive
energy
import (Ri+)
Q1
13 0x0D
Unsigned
Long
(UInt32)
The read data will be “17244” and user should implement the coefficient to show value properly with or without
comma.
6.5 Read Data Settings Table6.5 Read Data Settings Table
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway reads the data table of IEC62056-21 meter and following
settings can be read or altered:
RegisterRegister
NumberNumber DefinitionDefinition ExplanationExplanation
ModbusModbus
AddressAddress
(Decimal)(Decimal)
ModbusModbus
AddressAddress
(Hexadecimal)(Hexadecimal)
Data TypeData Type
1Modbus
Address
LKM Series Modbus RTU to IEC62056-21
Protocol Gateway Modbus Device Address for
Communication. Default Address is 0x01
128 0x80
Unsigned
Integer
(UInt16)
2Period (in
seconds)
Defines duration in seconds after successfully
reading of IEC62056-21 Meter. This duration is
also valid for waiting after failed reading
attempt. Default value is 10 seconds.
129 0x81
Unsigned
Integer
(UInt16)
3Table Code
(as Hex)
Different read-out tables can be read from
meter and this code defines which table to read
and which code should be submitted to meter
during Acknowledgement/option select
message Message of IEC62056-21 Standard
Mode C or E:
ACK
Protocol
Control
Character
Baud Rate
Identification
TABLETABLE
CODECODE CR LF
Default value is 0x30 means ASCII “0”.
130 0x82
Unsigned
Integer
(UInt16)

4
Meter
Reading
Method
Accepts 1 byte.
There are 2 methods available currently that
defines the way data read from IEC62056-21
meter and parsed
1.1. Method 1: Hexadecimal 0x00Method 1: Hexadecimal 0x00
LKM Series Modbus RTU to IEC62056-21
Protocol Gateway reads all data available in
read-out table and stores in temporary
memory which has capacity around 2,7kB. After
that BCC control sequence started based on
definitions of IEC62056-21 standard. If BCC
control passes the reading is marked as
successful and data search starts. The found
values are mapped in Modbus registers and
others are kept zero “0”. This method is safest
since it controls BCC but should be used in
shorter tables such as service tables (shorter
than 2kB)
2.2. Method 2: Hexadecimal 0x01Method 2: Hexadecimal 0x01
LKM Series Modbus RTU to IEC62056-21
Protocol Gateway reads the read-out table
and simultaneously checks each read line for
the first occurrence of search strings. If a new
match occurs than the found value is mapped
in Modbus register as a new value. This is the
default and fastest method to read for all kind
of tables of IEC 62056-21 meters.
WARNING:WARNING: Method 1 fails in long tables
which are over 2kB. It is a good idea to
always try reading with Method 2 in the first
implementation.
Default value is 0x01.
131 0x83
Unsigned
Integer
(UInt16)
5
Send
Initialization
String
Quantity
This value defines how many times the
initialization string will be sent before IEC62056-
21 Mode C Request ( first ) message.
If this option is not used should be set to 0.
WARNING:WARNING: Initialization string is defined in
different register. This option defines how
many times it should be sent before
communication start only.
132 0x84
Unsigned
Integer
(UInt16)

6Read Meter
Quantity
This value defines how many meters will be
read in same RS485 connected to same LKM
device.
Meter adress values defied in different
register.
WARNING:WARNING: If there are more than 1 meter
in same RS485 bus of LKM ( LKM supports up
to 10 meters) then IEC address of the meters
must be entered. Adress values are entered
in different registers.
133 0x85
Unsigned
Integer
(UInt16)
6.6 Read Data Settings Table: Reading with Modbus Commands6.6 Read Data Settings Table: Reading with Modbus Commands
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway read data settings table can be read by Holding Register
command (Function Code 0x03). Values can be queried individually or as array as shown in Modbus Data Registers
reading.
6.7 Read Data Settings Table: Altering with Modbus Commands6.7 Read Data Settings Table: Altering with Modbus Commands
LKM Series Modbus RTU to IEC62056-21 Protocol Gateway read data settings table values can be altered by Preset
Single Register command (Function Code 6). Values can be altered one at a time only.
Register NumberRegister Number DefinitionDefinition ExplanationExplanation Modbus AddressModbus Address
(Decimal)(Decimal)
Modbus AddressModbus Address
(Hexadecimal)(Hexadecimal) Data TypeData Type
1 Modbus Address
Once the
command sent the
device will respond
with old address.
New
communication
continues with new
address.
128 0x80 Unsigned Integer
(UInt16)
2Period (in
seconds)
Accepts 1 byte.
It can be
between 1 and 255
129 0x81 Unsigned Integer
(UInt16)

3Table Code (as
Hex)
Accepts 1 byte.
Examples:Examples:
0x30 means
ASCII ‘0’ as table
number
0x37 means ASCII
‘7’ as table number
130 0x82 Unsigned Integer
(UInt16)
4Meter Reading
Method
Accepts 1 byte.
There are 2
methods available
currently that
defines the way
data read from
IEC62056-21 meter
and parsed
1. Method 1: Read
full table and check
BCC and register
data
Hexadecimal
0x00
2. Method 2:
Read each line of
table and register
data during
reading
Hexadecimal
0x01
WARNING:WARNING:
Method 1 fails in
long tables
which are over
2,7kB. It is a
good idea to
always try
reading with
Method 2 in the
first
implementation.
131 0x83 Unsigned Integer
(UInt16)
5
Send
Initialization String
Quantity
Accepts 1 byte.
It can be
between 0 and 4
132 0x84 Unsigned Integer
(UInt16)
Accepts 1 byte.
It can be