Lovato Electric · Power analyzer

DMG610 (DMG series power analyzer) Modbus register map

Default configuration

Protocol: RS485
Port: 502
Unit ID: 1
Addressing: 1-based
Byte order: Big endian
Word order: High word first
Baud rate: 9600
Parity: None
Data bits: 8
Stop bits: 1

This device has an RS-485 interface. Reach it through a Modbus RTU-to-TCP gateway, configured with the factory serial settings above.

Register map

Address	Count	Name	Type	Unit	Scale	Access
2	2	L1 phase voltage	UInt32	V	0.01	R
4	2	L2 phase voltage	UInt32	V	0.01	R
6	2	L3 phase voltage	UInt32	V	0.01	R
8	2	L1 current	UInt32	A	0.0001	R
10	2	L2 current	UInt32	A	0.0001	R
12	2	L3 current	UInt32	A	0.0001	R
14	2	L1-L2 voltage	UInt32	V	0.01	R
16	2	L2-L3 voltage	UInt32	V	0.01	R
18	2	L3-L1 voltage	UInt32	V	0.01	R
20	2	L1 active power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	W	0.01	R
22	2	L2 active power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	W	0.01	R
24	2	L3 active power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	W	0.01	R
26	2	L1 reactive power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	var	0.01	R
28	2	L2 reactive power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	var	0.01	R
30	2	L3 reactive power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	Int32	var	0.01	R
32	2	L1 apparent power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	UInt32	VA	0.01	R
34	2	L2 apparent power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	UInt32	VA	0.01	R
36	2	L3 apparent power Signed/unsigned 32-bit integer scaled by 100. The instrument switches every power measurement to a 1/10 W resolution when the maximum theoretical power per phase exceeds 5 MW; register 2F70h reports which resolution is active.	UInt32	VA	0.01	R
38	2	L1 power factor	Int32	-	0.0001	R
40	2	L2 power factor	Int32	-	0.0001	R
42	2	L3 power factor	Int32	-	0.0001	R
50	2	Frequency	UInt32	Hz	0.001	R
84	2	L1 voltage THD	UInt32	%	0.01	R
86	2	L2 voltage THD	UInt32	%	0.01	R
88	2	L3 voltage THD	UInt32	%	0.01	R

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Notes

RS-485 device: reach it through a Modbus RTU-to-TCP gateway using the factory serial settings above. Source: Lovato Electric "DMG series - Modbus communication protocol", document I317 I GB 02_22 (07/02/2022), table 2 "Measures supplied by serial communication protocol" (functions 03 and 04), plus parameters P07.n.01...P07.n.05 of the DMG600/DMG610 instruction manual I411 DGB 04_15 for the factory serial settings. The protocol document numbers the registers one-based; the vendor itself says the address in the query has to be decreased by one, which is what the one_based mode does. Note that Lovato's own sample/community driver for this meter (volkszaehler mbmd, driver DMG610) reads L1 voltage at wire address 0x0001, i.e. register 0x0002 of the table - a secondary-source cross-check of the addressing. Scaling follows the "UNIT" column: V/100, A/10000, W|var|VA/100, power factor/10000, Hz/1000, %/100. Power measurements are returned with a 1/100 resolution unless the maximum theoretical power per phase exceeds 5 MW, in which case the instrument switches all power rows to 1/10; register 2F70h (read with function 03) answers 0000h for the standard resolution. Factory serial settings: node address 01, 9600 bps, 8 bit no parity, 1 stop bit, Modbus RTU (P07.n.01...P07.n.05). The energy counters are not listed: for the DMG6xx...9xx family they are 64-bit "Unsigned long-long" values (table 2, 1B20h, 1B24h, 1B28h, 1B2Ch, 1B30h and the 1E20h per-phase block) and this library has no 64-bit register format, so they cannot be read without truncation. Rows whose model column in table 2 does not mark the DMG6xx (neutral-earth voltage 006Ah, neutral current 006Ch and 0048h, the *equivalent* voltage/current/power block 0034h-0040h, cos phi 002Ch-0030h, current THD 005Ah-005Eh and the L-L voltage THD rows 0060h-0064h) are left out rather than assumed.