Connect Larsen Toubro to the computer through a USB-to-serial or RS485 adapter and read its registers in your browser: click "Read register values online" under the model (Chrome or Edge, nothing to install). The tables below list the MODBUS offset, unit, data type and scale of every register shown.
For logging 24/7 into a database, CSV files or Excel, use the Advanced Serial Data Logger (for MODBUS RTU) or Advanced TCP/IP Data Logger (for MODBUS TCP): they poll the complete map of every model on this page and provide continuous Larsen Toubro data logger and record.
Do you not know the meter address? Scan the device address online
Larsen Toubro (ER300P) - MODBUS Registers
Connection and addressing notes
- Access
- read only
- Function code
- 04 read input registers
- Register addressing
- 30000 series references, offset 0 = 30001
Registers in the map: 29. function 4 (input registers). byte order big-endian. data types: dword, smallint, word.
| MODBUS offset | Description | Units | Data type | Scale |
|---|
| 0 | R line voltage | V | word | ×0.01 |
| 1 | Y line voltage | V | word | ×0.01 |
| 2 | B line voltage | V | word | ×0.01 |
| 3 | R phase voltage | V | word | ×0.01 |
| 4 | Y phase voltage | V | word | ×0.01 |
| 5 | B phase voltage | V | word | ×0.01 |
| 6 | R phase current | deg C | word | ×0.001 |
| 7 | Y phase current | deg C | word | ×0.001 |
| 8 | B phase current | deg C | word | ×0.001 |
| 9 | Total active power | W | smallint | ×0.1 |
| 10 | Total reactive power | var | smallint | ×0.1 |
| 11 | Total apparent power | VA | smallint | ×0.1 |
| 12 | Total power factor | | smallint | ×0.01 |
| 13 | Average frequency | | word | ×0.001 |
| 14 | Tamper status | | word | |
| 18 | Current time format, year, month (BCD) | | word | |
| 19 | Current time format, date day (BCD) | | word | |
| 20 | Current time format, hour minute (BCD) | | word | |
| 21 | Current time: format: second, dummy (BCD) | | word | |
| 22 | Cumulative energy, forward | Wh | dword | ×0.1 |
| 24 | Cumulative energy, reverse | Wh | dword | ×0.1 |
| 26 | Cumulative energy, forward | varh | dword | ×0.1 |
| 28 | Cumulative energy, reverse | varh | dword | ×0.1 |
| 30 | Anomaly string (ASCII) | | dword | |
| 32 | 00:00 hr forward Wh of present day | Wh | dword | ×0.1 |
| 34 | 00:00 hr forward Wh of previous day | Wh | dword | ×0.1 |
| 36 | 00:00 hr reverse Wh of present day | Wh | dword | ×0.1 |
| 38 | 00:00 hr reverse wh of previous day | Wh | dword | ×0.1 |
| 40 | CT tapping | | word | |
Larsen Toubro (Quasar) - MODBUS Maps
Connection and addressing notes
- Protocol
- Modbus
- Default baud rate
- 4800
- Parity
- odd
- Default device address
- 1
- Meter address register
- 42385
- Baud rate register
- 42386, read 1 = 4800, 2 = 9600, write 5 = 4800, 6 = 9600
- Parity register
- 42387, 0 = none, 1 = odd, 2 = even
- Default setup register values
- 1 for meter address, baud rate and parity
- Data function code
- 04 read input registers
- Setup register function codes
- 03 read holding, 06 or 16 write
- 32-bit value format
- first word 0x0000 for positive or 0xFFFF for negative, second word the value or its 2's complement
Registers in the map: 27. function 4 (input registers). byte order big-endian. data types: dword.
| MODBUS offset | Description | Units | Data type | Scale |
|---|
| 0 | Phase 1 voltage | | dword | ×0.01 |
| 2 | Phase 2 voltage | | dword | ×0.01 |
| 4 | Phase 3 voltage | | dword | ×0.01 |
| 6 | Phase 1 current | | dword | ×0.001 |
| 8 | Phase 2 current | | dword | ×0.001 |
| 10 | Phase 3 current | | dword | ×0.001 |
| 12 | Phase 1 active power | | dword | ×0.0001 |
| 14 | Phase 2 active power | | dword | ×0.0001 |
| 16 | Phase 3 active power | | dword | ×0.0001 |
| 18 | Phase 1 reactive power | | dword | ×0.0001 |
| 20 | Phase 2 reactive power | | dword | ×0.0001 |
| 22 | Phase 3 reactive power | | dword | ×0.0001 |
| 24 | Phase 1 apparent power | | dword | ×0.0001 |
| 26 | Phase 2 apparent power | | dword | ×0.0001 |
| 28 | Phase 3 apparent power | | dword | ×0.0001 |
| 30 | Phase 1 power factor | | dword | ×0.001 |
| 32 | Phase 2 power factor | | dword | ×0.001 |
| 34 | Phase 3 power factor | | dword | ×0.001 |
| 36 | Total active power | | dword | ×0.0001 |
| 38 | Total reactive power | | dword | ×0.0001 |
| 40 | Total apparent power | | dword | ×0.0001 |
| 42 | Total power factor | | dword | ×0.001 |
| 512 | Cumulative energy forward | kVAh | dword | ×0.01 |
| 514 | Cumulative energy forward | kWh | dword | ×0.01 |
| 516 | Cumulative energy forward (lag) | kvarh | dword | ×0.01 |
| 518 | Cumulative energy forward (lead) | kvarh | dword | ×0.01 |
| 1280 | Power demand | | dword | ×0.01 |
Larsen Toubro (Vega) - MODBUS Mapping
Connection and addressing notes
- Protocol
- Modbus
- Function codes
- 04 read input registers (I-REGS), 03 read holding registers
- Register addressing
- 30001 and 40001 references, offset = reference minus 30001 or 40001
- 32-bit value format
- first word 0x0000 for positive or 0xFFFF for negative, second word the value or its 2's complement
- Cumulative energy format
- 3-word values, most significant byte first
Registers in the map: 120 (the first 56 are listed below; the browser reader and the data loggers use the complete map). function 3 (holding registers). function 4 (input registers). byte order big-endian. data types: double, dword, word.
| MODBUS offset | Description | Units | Data type | Scale |
|---|
| 256 | Voltage lower limit (vl) (9.6<vl<vu) | | word | ×0.01 |
| 257 | Voltage upper limit (vu) (vl<vu<264) | | word | ×0.01 |
| 258 | Current lower limit (cl) (0.1<cl<cu) | | word | ×0.01 |
| 259 | Current upper limit (cu) (cl<cu<5.867) | | word | ×0.01 |
| 260 | Frequency lower limit (fl) (40<fl<fu) | | word | ×0.01 |
| 261 | Frequency upper limit (fu) (fl<fu<70) | | word | ×0.01 |
| 0 | R phase voltage | | dword | ×0.01 |
| 2 | Y phase voltage | | dword | ×0.01 |
| 4 | B phase voltage | | dword | ×0.01 |
| 6 | R phase current | | dword | ×0.001 |
| 8 | Y phase current | | dword | ×0.001 |
| 10 | B phase current | | dword | ×0.001 |
| 12 | Active power R phase | | dword | ×0.0001 |
| 14 | Active power R phase | | word | |
| 15 | Active power Y phase | | dword | ×0.0001 |
| 17 | Active power Y phase | | word | |
| 18 | Active power B phase | | dword | ×0.0001 |
| 20 | Active power B phase | | word | |
| 21 | Reactive power R phase | | dword | ×0.0001 |
| 23 | Reactive power R phase | | word | |
| 24 | Reactive power Y phase | | dword | ×0.0001 |
| 26 | Reactive power Y phase | | word | |
| 27 | Reactive power B phase | | dword | ×0.0001 |
| 29 | Reactive power B phase | | word | |
| 30 | Apparent power R phase | | dword | ×0.0001 |
| 32 | Apparent power R phase | | word | |
| 33 | Apparent power Y phase | | dword | ×0.0001 |
| 35 | Apparent power Y phase | | word | |
| 36 | Apparent power B phase | | dword | ×0.0001 |
| 38 | Apparent power B phase | | word | |
| 39 | Power factor R phase | | dword | ×0.001 |
| 41 | Power factor Y phase | | dword | ×0.001 |
| 43 | Power factor B phase | | dword | ×0.001 |
| 45 | Total active power | | dword | ×0.0001 |
| 47 | Total active power | | word | |
| 48 | Total reactive power | | dword | ×0.0001 |
| 50 | Total reactive power | | word | |
| 51 | Total apparent power | | dword | ×0.0001 |
| 53 | Total apparent power | | word | |
| 54 | Total power factor | | dword | ×0.001 |
| 56 | Line frequency | | dword | ×0.01 |
| 58 | Ry line voltage | | dword | ×0.01 |
| 60 | Yb line voltage | | dword | ×0.01 |
| 62 | Br line voltage | | dword | ×0.01 |
| 64 | Average phase voltage | | dword | ×0.01 |
| 66 | Average phase current | | dword | ×0.001 |
| 68 | R phase voltage harmonic | | dword | ×0.01 |
| 70 | Y phase voltage harmonic | | dword | ×0.01 |
| 72 | B phase voltage harmonic | | dword | ×0.01 |
| 74 | R phase current harmonic | | dword | ×0.001 |
| 76 | Y phase current harmonic | | dword | ×0.001 |
| 78 | B phase current harmonic | | dword | ×0.001 |
| 80 | Phase difference R voltage and current | | dword | ×0.01 |
| 82 | Phase difference Y voltage and current | | dword | ×0.01 |
| 84 | Phase difference B voltage and current | | dword | ×0.01 |
| 86 | Voltage unbalance R phase | | dword | ×0.001 |
This is not the complete map: 56 of 120 registers are listed above. Click "Read register values online" to read any register of your device in the browser, or download the program to log the complete map.
Related MODBUS registers maps
MODBUS Maps Index
Landis Gyr (E650,Gateway,Meter 4)
Krohne (IFC050)
Lifasa (MCA PLUS II)
Lovato (DME)
Note: Products and companies mentioned here are used only for definition and identification purposes and can be trademarks and/or registered trademarks of the respective companies.
