- Auto reads Electricity meters that communicates in P1 Companion Standard and maps in predefined MODBUS register table
- Configurable Modbus address via Modbus Commands
- Configurable Reading Period on P1 Companion Standard side via Modbus Commands
- Auto request data from meter
- Wide range power input: 5V – 24V 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
MODBUS RTU AND P1 COMPANION STANDARD CHARACTERISTICS
Modbus RTU Address
Default value is 0x01
Changeable via Modbus Command
Reading Period on P1 Protocol Meter Side
Default value is 10 (in seconds)
Changeable via Modbus Command
P1 Protocol Meter Reading Method
Read each line of table and register data during reading
P1 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 and depends on meter data
Monitoring Parameters
IEC Read counter
Time counter (in seconds)
FW version
Query able via Modbus Commands
INTERFACE AND INDICATORS
P1 Connector Terminal Connector for 3 wire P1 connection ( Data, Data Request, GND) on Meter SideRJ12 cable connection to meter must be prepared for meter connection based on desired length.Check manual for cable pins.RS485 Connector Terminal Connector for 2 wire RS485 connection and GND on Modem SideOperation Mode Selection SwitchSelects the operating mode of the device.
( can be different depending on customer specific firmware)
Mode Selection
| Modem Side Communication Parameters
| Meter Side Communication Parameters
|
| Mode 1 (LED 1 ON) | 9600 8N1
| 9600 8N1 Fixed
|
Mode 2 (LED 2 ON)
| 19200 8N1
| 19200 8N1 Fixed
|
Mode 3 (LED 3 ON)
| 57600 8N1
| 57600 8N1 Fixed
|
Mode 4 (LED 4 ON)
| 115200 8N1
| 115200 8N1 Fixed
|
LED IndicatorsFollowing 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 UPGRADE
Upgrade over Serial Line
Available from Modem side Serial Line
RS485 on LKM124
Device must be on operating mode 19200 8N1 for firmware upgrade process.
POWER
Power Input
5V – 24V DC
Reverse Polarity Protection
Available
Thermal Shutdown Protection
Available
PHYSICAL AND ENVIRONMENTAL CHARACTERISTICS
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
LKM124: Modem side RS485, Meter side P1 Interface, Modbus RTU to P1 Companion Standard Meter gateway
