Janitza UMG 801 Modbus register map

Energy analyzer

Official
11,460 registers
Revision 3 · 2026-11-10

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol: Modbus TCP and RTUdefault
Unit ID: 1default
TCP port: 502default
Serial: 9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
Byte / word order: ABCD · bytes big-endian, words high first
Addresses: 0-based

Connection values are defaults: the device may be configured differently.

Map

Registers: 11460 holding registers
Groups: 44
Revision: 3 · 2026-11-10
Firmware: 1.6.2
Added: 2026-10-14 (2026-10-14)
File: maps/janitza/umg-801.mbmap.json · 2.9 MB · history
SHA-256: 09e99e820fdf776590f89f37da9b0824a3e29181159619863e149baaa15f3af4
Manufacturer: janitza.com

Sources and notes

UMG 801 and modules Modbus address list (formulary and table) · version Firmware 1.6.2, status 06/2025, Doc. no. 2.053.016.1.b (table 2.053.265.1.a)
zip with the formulary (PDF) and the address table (xlsx)

Source: Janitza electronics, "UMG 801 and modules: Formulary to the Modbus address list" and address table, firmware 1.6.2, status 06/2025, Doc. no. 2.053.016.1.b

Addresses are the protocol addresses of the address table; values are big-endian.
Date and time values occupy two registers; the address list does not give their encoding, so they are shown as raw 32-bit numbers.
Boolean values are one register, read as 0 or 1.

Area	Address	Type	Access	Unit	Description
HR	4100	string[32]	R		Name
HR	4132	string[32]	R		firmware version
HR	4164	uint64 ABCD	R		hardware version
HR	4168	uint16	R
HR	4169	uint16	R
HR	4170	uint64 ABCD	R		product number
HR	4174	uint64 ABCD	R		serial number
HR	4178	string[32]	R		Name
HR	4210	string[32]	R		firmware version
HR	4242	uint64 ABCD	R		hardware version
HR	4246	uint16	R
HR	4247	uint16	R
HR	4248	uint64 ABCD	R		product number
HR	4252	uint64 ABCD	R		serial number
HR	4256	uint32 ABCD	R		ID
HR	4258	string[32]	R		Name
HR	4290	string[32]	R		firmware version
HR	4322	uint64 ABCD	R		hardware version
HR	4326	uint16	R
HR	4327	uint16	R
HR	4328	uint64 ABCD	R		product number
HR	4332	uint64 ABCD	R		serial number
HR	4336	uint32 ABCD	R		ID
HR	4338	string[32]	R		Name
HR	4370	string[32]	R		firmware version
HR	4402	uint64 ABCD	R		hardware version
HR	4406	uint16	R
HR	4407	uint16	R
HR	4408	uint64 ABCD	R		product number
HR	4412	uint64 ABCD	R		serial number
HR	4416	uint32 ABCD	R		ID
HR	4418	string[32]	R		Name
HR	4450	string[32]	R		firmware version
HR	4482	uint64 ABCD	R		hardware version
HR	4486	uint16	R
HR	4487	uint16	R
HR	4488	uint64 ABCD	R		product number
HR	4492	uint64 ABCD	R		serial number
HR	4496	uint32 ABCD	R		ID
HR	4498	string[32]	R		Name
HR	4530	string[32]	R		firmware version
HR	4562	uint64 ABCD	R		hardware version
HR	4566	uint16	R
HR	4567	uint16	R
HR	4568	uint64 ABCD	R		product number
HR	4572	uint64 ABCD	R		serial number
HR	4576	uint32 ABCD	R		ID
HR	4578	string[32]	R		Name
HR	4610	string[32]	R		firmware version
HR	4642	uint64 ABCD	R		hardware version
HR	4646	uint16	R
HR	4647	uint16	R
HR	4648	uint64 ABCD	R		product number
HR	4652	uint64 ABCD	R		serial number
HR	4656	uint32 ABCD	R		ID
HR	4658	string[32]	R		Name
HR	4690	string[32]	R		firmware version
HR	4722	uint64 ABCD	R		hardware version
HR	4726	uint16	R
HR	4727	uint16	R
HR	4728	uint64 ABCD	R		product number
HR	4732	uint64 ABCD	R		serial number
HR	4736	uint32 ABCD	R		ID
HR	4738	string[32]	R		Name
HR	4770	string[32]	R		firmware version
HR	4802	uint64 ABCD	R		hardware version
HR	4806	uint16	R
HR	4807	uint16	R
HR	4808	uint64 ABCD	R		product number
HR	4812	uint64 ABCD	R		serial number
HR	4816	uint32 ABCD	R		ID
HR	4818	string[32]	R		Name
HR	4850	string[32]	R		firmware version
HR	4882	uint64 ABCD	R		hardware version
HR	4886	uint16	R
HR	4887	uint16	R
HR	4888	uint64 ABCD	R		product number
HR	4892	uint64 ABCD	R		serial number
HR	4896	uint32 ABCD	R		ID
HR	4898	string[32]	R		Name
HR	4930	string[32]	R		firmware version
HR	4962	uint64 ABCD	R		hardware version
HR	4966	uint16	R
HR	4967	uint16	R
HR	4968	uint64 ABCD	R		product number
HR	4972	uint64 ABCD	R		serial number
HR	4976	uint32 ABCD	R		ID
HR	5000	float32 ABCD	R	V	Average Value L1 Voltage L-N (RMS)
HR	5002	float32 ABCD	R	V	Average Value L2 Voltage L-N (RMS)
HR	5004	float32 ABCD	R	V	Average Value L3 Voltage L-N (RMS)
HR	5006	float32 ABCD	R	V	Average Value L1-L2 Voltage L-L (RMS)
HR	5008	float32 ABCD	R	V	Average Value L2-L3 Voltage L-L (RMS)
HR	5010	float32 ABCD	R	V	Average Value L3-L1 Voltage L-L (RMS)
HR	5012	float32 ABCD	R	A	Average Value L1 Current (RMS)
HR	5014	float32 ABCD	R	A	Average Value L2 Current (RMS)
HR	5016	float32 ABCD	R	A	Average Value L3 Current (RMS)
HR	5018	float32 ABCD	R	A	Average Value L4 Current (RMS)
HR	5020	float32 ABCD	R	A	Average Value Sum L1..L4 Current (RMS)
HR	5022	float32 ABCD	R	W	Average Value L1 Active Power
HR	5024	float32 ABCD	R	W	Average Value L2 Active Power

Help improve this map

I tested it on a deviceReport whether it worked, even if you did not write the map.
Suggest a correctionEdit the file on GitHub; it opens a pull request.
Report a problemA wrong address, type, scale or byte order.
Read the formatWhat each key of the file means (SPEC.md).