EM23XX Modbus register map

Also covers RISH EM 1320, RISH EM 1330, RISH EM 1340, RISH EM 2340

Rishabh RISH EM 13xx / 23xx energy meters with RS-485 (Modbus RTU)

Official
97 registers
Modbus RTU
Revision 2 · 2026-10-17

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.

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Communication

Protocol: Modbus RTU
Unit ID: 1
Serial: 9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
Byte / word order: ABCD · bytes big-endian, words high first
Addresses: 0-based
Max read: 40 registers per request

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

Map

Registers: 97 input registers
Groups: 4
Revision: 2 · 2026-10-17
Added: 2026-10-14 (2026-10-14)
File: maps/rish/em1300-em2300-em13xx-em23xx.mbmap.json · 17 KB · history
SHA-256: 1b23dc9071fba25759c965af6431580122d47e11e514f58572effa47896c32c6
Manufacturer: rishabh.co.in

Sources and notes

RISH EM 2340/1320/30/40 Interface Definition · version Rev B, 2020-06
tables 1 and 2

Source: Rishabh Instruments, "RISH EM 2340/1320/30/40 Interface Definition", Rev B (2020-06)

Measured values are float32 input registers (FC04, two registers each, most significant byte first); at most 20 values per request.
Energies are given here without a unit because the interface definition does not state it. The overflow counters count energy register rollovers.
Registers marked for 3P4W, 3P3W or 1P2W read 0 on the other wiring systems (manual table 1).
Models 1320/30/40 count import and export energy; the 2340 counts utility and generator energy. Values marked only 2340 are on the EM 2340 only; the THD registers are not on the 1320 and 1330.
Not in this map: the 'old' (previous period) values, the values updated at the user update rate, the 4X copies and the setup registers.

Area	Address	Type	Access	Unit	Description
IR	0	float32 ABCD	R	V	L-N on 3P4W, L-L on 3P3W
IR	2	float32 ABCD	R	V	Valid on 3P4W, 3P3W; reads 0 otherwise L-N on 3P4W, L-L on 3P3W
IR	4	float32 ABCD	R	V	Valid on 3P4W, 3P3W; reads 0 otherwise L-N on 3P4W, L-L on 3P3W
IR	6	float32 ABCD	R	A
IR	8	float32 ABCD	R	A	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	10	float32 ABCD	R	A	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	12	float32 ABCD	R	W	Valid on 3P4W, 1P2W; reads 0 otherwise
IR	14	float32 ABCD	R	W	Valid on 3P4W; reads 0 otherwise
IR	16	float32 ABCD	R	W	Valid on 3P4W; reads 0 otherwise
IR	18	float32 ABCD	R	VA	Valid on 3P4W, 1P2W; reads 0 otherwise
IR	20	float32 ABCD	R	VA	Valid on 3P4W; reads 0 otherwise
IR	22	float32 ABCD	R	VA	Valid on 3P4W; reads 0 otherwise
IR	24	float32 ABCD	R	var	Valid on 3P4W, 1P2W; reads 0 otherwise
IR	26	float32 ABCD	R	var	Valid on 3P4W; reads 0 otherwise
IR	28	float32 ABCD	R	var	Valid on 3P4W; reads 0 otherwise
IR	30	float32 ABCD	R		Valid on 3P4W, 1P2W; reads 0 otherwise
IR	32	float32 ABCD	R		Valid on 3P4W; reads 0 otherwise
IR	34	float32 ABCD	R		Valid on 3P4W; reads 0 otherwise
IR	36	float32 ABCD	R	°	Valid on 3P4W, 1P2W; reads 0 otherwise
IR	38	float32 ABCD	R	°	Valid on 3P4W; reads 0 otherwise
IR	40	float32 ABCD	R	°	Valid on 3P4W; reads 0 otherwise
IR	42	float32 ABCD	R	V	L-N on 3P4W, L-L on 3P3W
IR	44	float32 ABCD	R	V	L-N on 3P4W, L-L on 3P3W
IR	46	float32 ABCD	R	A
IR	48	float32 ABCD	R	A
IR	50	float32 ABCD	R	W	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	52	float32 ABCD	R	W
IR	54	float32 ABCD	R	VA	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	56	float32 ABCD	R	VA
IR	58	float32 ABCD	R	var	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	60	float32 ABCD	R	var
IR	62	float32 ABCD	R
IR	64	float32 ABCD	R		Valid on 3P4W; reads 0 otherwise
IR	66	float32 ABCD	R	°
IR	68	float32 ABCD	R	°	Valid on 3P4W; reads 0 otherwise
IR	70	float32 ABCD	R	Hz
IR	72	float32 ABCD	R
IR	74	float32 ABCD	R
IR	76	float32 ABCD	R
IR	78	float32 ABCD	R
IR	80	float32 ABCD	R
IR	82	float32 ABCD	R		EM 2340 only
IR	84	float32 ABCD	R	W
IR	86	float32 ABCD	R	W
IR	88	float32 ABCD	R	W
IR	90	float32 ABCD	R	W
IR	100	float32 ABCD	R	VA
IR	102	float32 ABCD	R	VA
IR	104	float32 ABCD	R	A
IR	106	float32 ABCD	R	A
IR	108	float32 ABCD	R
IR	112	float32 ABCD	R
IR	116	float32 ABCD	R
IR	120	float32 ABCD	R
IR	124	float32 ABCD	R
IR	128	float32 ABCD	R		EM 2340 only
IR	132	float32 ABCD	R	V
IR	134	float32 ABCD	R	V
IR	136	float32 ABCD	R	rpm
IR	140	float32 ABCD	R	A
IR	142	float32 ABCD	R	A
IR	192	float32 ABCD	R	VA
IR	194	float32 ABCD	R	A
IR	200	float32 ABCD	R	V	Valid on 3P4W; reads 0 otherwise
IR	202	float32 ABCD	R	V	Valid on 3P4W; reads 0 otherwise
IR	204	float32 ABCD	R	V	Valid on 3P4W; reads 0 otherwise
IR	206	float32 ABCD	R	%
IR	208	float32 ABCD	R	%	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	210	float32 ABCD	R	%	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	212	float32 ABCD	R	%
IR	214	float32 ABCD	R	%	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	216	float32 ABCD	R	%	Valid on 3P4W, 3P3W; reads 0 otherwise
IR	218	float32 ABCD	R	%
IR	220	float32 ABCD	R	%
IR	224	float32 ABCD	R	A	Valid on 3P4W; reads 0 otherwise
IR	226	float32 ABCD	R	h
IR	228	float32 ABCD	R	h
IR	230	float32 ABCD	R
IR	236	float32 ABCD	R	h	EM 2340 only
IR	238	float32 ABCD	R	h	EM 2340 only
IR	240	float32 ABCD	R		EM 2340 only
IR	242	float32 ABCD	R	h	EM 2340 only
IR	244	float32 ABCD	R	h	EM 2340 only
IR	266	float32 ABCD	R
IR	268	float32 ABCD	R
IR	768	uint32 ABCD	R
IR	770	uint32 ABCD	R
IR	772	uint32 ABCD	R
IR	774	uint32 ABCD	R
IR	776	uint32 ABCD	R
IR	778	uint32 ABCD	R		EM 2340 only
IR	780	uint32 ABCD	R
IR	782	uint32 ABCD	R
IR	784	uint32 ABCD	R
IR	786	uint32 ABCD	R
IR	788	uint32 ABCD	R
IR	790	uint32 ABCD	R		EM 2340 only

The first 100 registers are shown. The full list is in the map file.

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