Modbus RTU
Lovato DMG210
Lovato
Modular three-phase multimeter with RS485: voltages, currents, power, power factor, THD and energy counters over Modbus RTU.
Overview
The Lovato DMG210 is a modular digital multimeter for three-phase low-voltage networks with a built-in RS485 port. This template follows table 2 of the Lovato document I317IGB02_22, Modbus communication protocol for the DMG series (07/02/2022), and reads voltages, currents including neutral current, active, reactive and apparent power per phase and for the three-phase system, power factor, asymmetry, THD per phase and the total imported and exported energy counters. Default Modbus RTU link: address 1, 9600 baud, 8 data bits, no parity, 1 stop bit.
Key readings
- Phase and line voltages
- Phase currents and neutral current
- Active, reactive and apparent power per phase and for the system
- Power factor per phase and for the system
- Voltage and current asymmetry, THD per phase
- Imported and exported active and reactive energy
Use cases
- Alert when System Active Power exceeds the capacity of a feeder or connection.
- Compare Current L1, L2 and L3 and Current Asymmetry to balance loads in a distribution board.
- Track Total Imported Active Energy per week to report consumption per group or tenant.
- Watch THD Voltage and THD Current per phase to find harmonic problems from drives or LED lighting.
- Log System Power Factor to decide whether reactive power compensation is needed.
Installation
- 1Connect the RS485 terminals A and B of the DMG210 to the RS485 port of your ModbusCloud Gateway. Terminate both ends of the bus.
- 2On the DMG210, open the setup menu M07 (Communication) and set P07.n.01 address, P07.n.02 speed (default 9600), P07.n.03 data format (default 8 bit, no parity) and P07.n.05 protocol to Modbus RTU.
- 3In ModbusCloud, add a Modbus device (RTU) with the same address and serial settings, then import this template.
- 4Check the link: Voltage L1-N should read about 230 V on a standard low-voltage network.
Things to watch for
- The DMG210 does not answer on the RS485 bus. What should I check?
- Check menu M07: the protocol must be Modbus RTU (Modbus ASCII is also possible), and address, speed and data format must match, by default address 1, 9600 baud, 8 bit, no parity, 1 stop bit. Then swap A and B and check the termination at both ends of the bus.
- Why are my values shifted or the meter returns an exception?
- The Lovato tables list addresses one higher than the address in the request. Voltage L1-N is table address 0002H but request address 1. Every value is two registers, so starting one register off gives nonsense or an invalid address error.
- The voltage reads 23000 instead of 230 V.
- The DMG210 sends integers with fixed scaling: voltage in V/100, current in A/10000, power in W/100 and energy in kWh/100. The template applies these factors; if you read the raw registers yourself, divide accordingly.
- Why is there no frequency register?
- The Lovato table lists frequency at 0032H, but the scale shown next to it is not unambiguous in the document, Hz/100 or Hz/1000. It is left out rather than risking a wrong value; you can add it yourself after checking it against the display.
Registers (43)
43 read / 0 write
| Name | Address | Function | Type | Unit | Access |
|---|---|---|---|---|---|
Voltage L1-N Phase voltage L1 in V/100, unsigned 32-bit. Lovato table address 0002H. | ••• | ••• | ••• | V | R |
Voltage L2-N Phase voltage L2 in V/100, unsigned 32-bit. Lovato table address 0004H. | ••• | ••• | ••• | V | R |
Voltage L3-N Phase voltage L3 in V/100, unsigned 32-bit. Lovato table address 0006H. | ••• | ••• | ••• | V | R |
Voltage L1-L2 Phase-to-phase voltage L1-L2 in V/100. Lovato table address 000EH. | ••• | ••• | ••• | V | R |
Voltage L2-L3 Phase-to-phase voltage L2-L3 in V/100. Lovato table address 0010H. | ••• | ••• | ••• | V | R |
Voltage L3-L1 Phase-to-phase voltage L3-L1 in V/100. Lovato table address 0012H. | ••• | ••• | ••• | V | R |
Current L1 Phase current L1 in A/10000. Lovato table address 0008H. | ••• | ••• | ••• | A | R |
Current L2 Phase current L2 in A/10000. Lovato table address 000AH. | ••• | ••• | ••• | A | R |
Current L3 Phase current L3 in A/10000. Lovato table address 000CH. | ••• | ••• | ••• | A | R |
System Active Power Three-phase system (Lovato: equivalent) active power in W/100, signed. Lovato table address 003AH. | ••• | ••• | ••• | W | R |
Active Power L1 Active power of phase L1 in W/100, signed. Lovato table address 0014H. | ••• | ••• | ••• | W | R |
Active Power L2 Active power of phase L2 in W/100, signed. Lovato table address 0016H. | ••• | ••• | ••• | W | R |
Active Power L3 Active power of phase L3 in W/100, signed. Lovato table address 0018H. | ••• | ••• | ••• | W | R |
System Reactive Power Three-phase system (equivalent) reactive power in var/100, signed. Lovato table address 003CH. | ••• | ••• | ••• | var | R |
System Apparent Power Three-phase system (equivalent) apparent power in VA/100. Lovato table address 003EH. | ••• | ••• | ••• | VA | R |
System Power Factor Three-phase system (equivalent) power factor in 1/10000, signed. Lovato table address 0040H. | ••• | ••• | ••• | R | |
Reactive Power L1 Reactive power of phase L1 in var/100, signed. Lovato table address 001AH. | ••• | ••• | ••• | var | R |
Reactive Power L2 Reactive power of phase L2 in var/100, signed. Lovato table address 001CH. | ••• | ••• | ••• | var | R |
Reactive Power L3 Reactive power of phase L3 in var/100, signed. Lovato table address 001EH. | ••• | ••• | ••• | var | R |
Apparent Power L1 Apparent power of phase L1 in VA/100. Lovato table address 0020H. | ••• | ••• | ••• | VA | R |
Apparent Power L2 Apparent power of phase L2 in VA/100. Lovato table address 0022H. | ••• | ••• | ••• | VA | R |
Apparent Power L3 Apparent power of phase L3 in VA/100. Lovato table address 0024H. | ••• | ••• | ••• | VA | R |
Power Factor L1 Power factor of phase L1 in 1/10000, signed. Lovato table address 0026H. | ••• | ••• | ••• | R | |
Power Factor L2 Power factor of phase L2 in 1/10000, signed. Lovato table address 0028H. | ••• | ••• | ••• | R | |
Power Factor L3 Power factor of phase L3 in 1/10000, signed. Lovato table address 002AH. | ••• | ••• | ••• | R | |
Equivalent Phase Voltage Equivalent (three-phase) phase voltage in V/100. Lovato table address 0034H. | ••• | ••• | ••• | V | R |
Equivalent Line Voltage Equivalent (three-phase) phase-to-phase voltage in V/100. Lovato table address 0036H. | ••• | ••• | ••• | V | R |
Equivalent Current Equivalent (three-phase) current in A/10000. Lovato table address 0038H. | ••• | ••• | ••• | A | R |
Neutral Current Neutral current in A/10000. Lovato table address 0048H. | ••• | ••• | ••• | A | R |
Line Voltage Asymmetry Phase-to-phase voltage asymmetry in %/100. Lovato table address 0042H. | ••• | ••• | ••• | % | R |
Phase Voltage Asymmetry Phase-to-neutral voltage asymmetry in %/100. Lovato table address 0044H. | ••• | ••• | ••• | % | R |
Current Asymmetry Current asymmetry in %/100. Lovato table address 0046H. | ••• | ••• | ••• | % | R |
THD Voltage L1 Total harmonic distortion of phase voltage L1 in %/100. Lovato table address 0054H. | ••• | ••• | ••• | % | R |
THD Voltage L2 Total harmonic distortion of phase voltage L2 in %/100. Lovato table address 0056H. | ••• | ••• | ••• | % | R |
THD Voltage L3 Total harmonic distortion of phase voltage L3 in %/100. Lovato table address 0058H. | ••• | ••• | ••• | % | R |
THD Current L1 Total harmonic distortion of current L1 in %/100. Lovato table address 005AH. | ••• | ••• | ••• | % | R |
THD Current L2 Total harmonic distortion of current L2 in %/100. Lovato table address 005CH. | ••• | ••• | ••• | % | R |
THD Current L3 Total harmonic distortion of current L3 in %/100. Lovato table address 005EH. | ••• | ••• | ••• | % | R |
Total Imported Active Energy Total imported active energy in kWh/100 (DMG210 32-bit counter). Rolls over to 0 after 19 999 999.99 kWh. Lovato table address 1A20H. | ••• | ••• | ••• | kWh | R |
Total Exported Active Energy Total exported active energy in kWh/100. Rolls over to 0 after 19 999 999.99 kWh. Lovato table address 1A22H. | ••• | ••• | ••• | kWh | R |
Total Imported Reactive Energy Total imported reactive energy in kvarh/100. Lovato table address 1A24H. | ••• | ••• | ••• | kvarh | R |
Total Exported Reactive Energy Total exported reactive energy in kvarh/100. Lovato table address 1A26H. | ••• | ••• | ••• | kvarh | R |
Total Apparent Energy Total apparent energy in kVAh/100. Lovato table address 1A28H. | ••• | ••• | ••• | kVAh | R |
Loading registers…
Read the Lovato DMG210 remotely
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