REDZ Smart Communication Technologies

-   Auto reads Electricity meters that communicates in IEC62056-21 standard (P1 Companion Standard on LKM124 model) 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 or P1 Companion Standard side via Modbus Commands
-   Configurable Reading Table Number on IEC6056-21 side via Modbus Commands
-   Wide range power input: 5V – 24V (maz. 28V) DC
-   Wide operating temperature range from -40 to 85 °C
-   Very Small form factor, only 2.1 x 4.2 x 4.4cm
-   Customization of reading process and register tables based on client request
-   Firmware upgradable over serial line

CONNECTIONS AND PROTOCOLS - LKM141

	Modem Side Connection	Modem Side Connection	Meter Side Protocol
LKM141	RS232	RS485	IEC62056-21

MODBUS DETAILS - LKM RTU Models

Modbus RTU Address
Default value is 0x01
Changeable via Modbus Command
Reading Period on Meter Side
Default value is 10 (in seconds)
Changeable via Modbus Command
IEC62056-21 Protocol Meter Read Out Table
Default value is 0x30 = ‘0’in ASCII
Changeable via Modbus Command
IEC62056-21 Protocol Meter Reading Method
Reads each line of table and register data during reading
IEC62056-21 Protocol Meter Read Out Data
Date
Time
Import and Export Active Energy
Import and Export Reactive Energy
Reactive Energy in 4 Quadrants
Import and Export Maximum Demands
Active Power
Phase Currents for each phase
Phase Voltages for each phase
Frequency
Error Code
Extendable/Changeable via firmware change
Monitoring Parameters
IEC Read counter
Time counter (in seconds)
FW version
Query via Modbus Commands

RS485 TERMINAL

RS485 Connector
Terminal Connector for 2 wire RS485 connection A - B and GND can be used as well.

RS232 TERMINAL

RS232 Connector
Terminal Connector for 3 wire RS232 connection Tx-Rx-GND

INTERFACE AND INDICATORS

Operation Mode Selection Switch
Selects the operating mode of the device

Mode Selection	Modem Side Communication Parameters	Meter Side Communication Parameters
Mode 1 (LED 1 ON)	19200 8N1	Starts with 300 baud rate and changes during transmission to target baud rate based on IEC62056-21 protocol
Mode 2 (LED 2 ON)	9600 8N1	Starts with 300 baud rate and changes during transmission to target baud rate based on IEC62056-21 protocol
Mode 3 (LED 3 ON)	19200 8N1	19200 7E1 Fixed
Mode 4 (LED 4 ON)	9600 8N1	9600 7E1 Fixed

LED Indicators
Following LEDs available to show system status.
1 – Mode 1 LED
2 – Mode 2 LED
3 – Mode 3 LED
4 – Mode 4 LED
5 – System LED: Blinks every second
6 – Tx LED: Sending data from Modem Side to Meter Side
7 – Rx LED: Receiving data from Meter Side to Modem Side

Firmware Upgarde

Upgrade over Serial Line
Available from Modem side Serial Line
Ex:RS232 on LKM111 or RS485 on LKM144

Device must be on operating mode 19200 8N1 for firmware upgrade process.

POWER - LKM DC Models

Power Input
5V – 24V DC
(LKM124 can also get power directly from P1 Standard Interface)
Reverse Polarity Protection
Available
Thermal Shutdown Protection
Available

PHYSICAL AND ENVIRONMENTAL CHARACTERISTICS - LKM DC POWERED Models

Enclosure
ABS, IP40
Dimensions
21 x 42 x 44 (h x w x d) mm
Weight
~60gr
Storage Temperature
-55 to 125 °C
Operating Temperature
-40 to 85 °C
Operating Humidity
5% to 95%Non-condensing

LKM141: Electricity Meter Protocol to Modbus RTU Protocol Gateway, Modem Side RS232 and Meter Side RS485, 5-24V DC Power Input

ZTerminal Software

↗ User Manual ☶ Datasheet