Carlo Gavazzi WM20/WM30/WM40 power meter

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale
Base firmware version	0	U16	1
Communication module firmware version	1	U16	1
Analogue output module firmware version	2	U16	1
Advanced six channel digital inputs + four channel outputs module firmware version	3	U16	1
Process module	4	U16	1
Analogue output module firmware version (position 2)	5	U16	1
Communication module firmware version	6	U16	1
Carlo Gavazzi Controls identification code	11	U16	1
Serial number Letter 1 & 2	32	U16	1
Serial number Letter 3 & 4	33	U16	1
Serial number Letter 5 & 6	34	U16	1
Serial number Letter 7 & 8	35	U16	1
Serial number Letter 9 & 10	36	U16	1
Serial number Letter 11 & 12	37	U16	1
Serial number Letter 13	38	U16	1
V L1-N	80	F32LE	1
V L2-N	82	F32LE	1
V L3-N	84	F32LE	1
V L-N Σ	86	F32LE	1
V L1-L2	88	F32LE	1
V L2-L3	90	F32LE	1
V L3-L1	92	F32LE	1
V L-L Σ	94	F32LE	1
A L1	96	F32LE	1
A L2	98	F32LE	1
A L3	100	F32LE	1
A N	102	F32LE	1
W L1	104	F32LE	1
W L2	106	F32LE	1
W L3	108	F32LE	1
W Σ	110	F32LE	1
VA L1	112	F32LE	1
VA L2	114	F32LE	1
VA L3	116	F32LE	1
VA Σ	118	F32LE	1
VAR L1	120	F32LE	1
VAR L2	122	F32LE	1
VAR L3	124	F32LE	1
VAR Σ	126	F32LE	1
PF L1	128	F32LE	1
PF L2	130	F32LE	1
PF L3	132	F32LE	1
PF Σ	134	F32LE	1
Hz	136	F32LE	1
Asymmetry L-N %	138	F32LE	1
Asymmetry L-L %	140	F32LE	1
Phase sequence	142	F32LE	1
A Σ / K-Factor L1	144	F32LE	1
K-Factor L2	146	F32LE	1
K-Factor L3	148	F32LE	1
Temperature	150	F32LE	1
Analogue Input	152	F32LE	1
A Σ	154	F32LE	1
THD tot VL1-N	160	F32LE	1
THD tot VL2-N	162	F32LE	1
THD tot VL3-N	164	F32LE	1
THD tot VL12	166	F32LE	1
THD tot VL23	168	F32LE	1
THD tot VL31	170	F32LE	1
THD tot AL1	172	F32LE	1
THD tot AL2	174	F32LE	1
THD tot AL3	176	F32LE	1
THD odd VL1-N	178	F32LE	1
THD odd VL2-N	180	F32LE	1
THD odd VL3-N	182	F32LE	1
THD odd VL12	184	F32LE	1
THD odd VL23	186	F32LE	1
THD odd VL31	188	F32LE	1
THD odd AL1	190	F32LE	1
THD odd AL2	192	F32LE	1
THD odd AL3	194	F32LE	1
THD even VL1-N	196	F32LE	1
THD even VL2-N	198	F32LE	1
THD even VL3-N	200	F32LE	1
THD even VL12	202	F32LE	1
THD even VL23	204	F32LE	1
THD even VL31	206	F32LE	1
THD even AL1	208	F32LE	1
THD even AL2	210	F32LE	1
THD even AL3	212	F32LE	1
TDD tot AL1	214	F32LE	1
TDD tot AL2	216	F32LE	1
TDD tot AL3	218	F32LE	1
Max V L1-N	336	F32LE	1
Max V L2-N	338	F32LE	1
Max V L3-N	340	F32LE	1
Max V L-N Σ	342	F32LE	1
Max V L1-L2	344	F32LE	1
Max V L2-L3	346	F32LE	1
Max V L3-L1	348	F32LE	1
Max V L-L Σ	350	F32LE	1
Max A L1	352	F32LE	1
Max A L2	354	F32LE	1
Max A L3	356	F32LE	1
Max A N	358	F32LE	1
Max W L1	360	F32LE	1
Max W L2	362	F32LE	1
Max W L3	364	F32LE	1
Max W Σ	366	F32LE	1
Max VA L1	368	F32LE	1
Max VA L2	370	F32LE	1
Max VA L3	372	F32LE	1
Max VA Σ	374	F32LE	1
Max VAR L1	376	F32LE	1
Max VAR L2	378	F32LE	1
Max VAR L3	380	F32LE	1
Max VAR Σ	382	F32LE	1
Max PF L1	384	F32LE	1
Max PF L2	386	F32LE	1
Max PF L3	388	F32LE	1
Max PF Σ	390	F32LE	1
Max Hz	392	F32LE	1
Max Asymmetry L-N %	394	F32LE	1
Max Asymmetry L-L %	396	F32LE	1
Max A Σ / Max K-Factor L1	400	F32LE	1
Max K-Factor L2	402	F32LE	1
Max K-Factor L3	404	F32LE	1
Max Temperature	406	F32LE	1
Max Analogue Input	408	F32LE	1
Max A Σ	410	F32LE	1
Max THD tot VL1-N	416	F32LE	1
Max THD tot VL2-N	418	F32LE	1
Max THD tot VL3-N	420	F32LE	1
Max THD tot VL12	422	F32LE	1
Max THD tot VL23	424	F32LE	1
Max THD tot VL31	426	F32LE	1
Max THD tot AL1	428	F32LE	1
Max THD tot AL2	430	F32LE	1
Max THD tot AL3	432	F32LE	1
Max THD odd VL1-N	434	F32LE	1
Max THD odd VL2-N	436	F32LE	1
Max THD odd VL3-N	438	F32LE	1
Max THD odd VL12	440	F32LE	1
Max THD odd VL23	442	F32LE	1
Max THD odd VL31	444	F32LE	1
Max THD odd AL1	446	F32LE	1
Max THD odd AL2	448	F32LE	1
Max THD odd AL3	450	F32LE	1
Max THD even VL1-N	452	F32LE	1
Max THD even VL2-N	454	F32LE	1
Max THD even VL3-N	456	F32LE	1
Max THD even VL12	458	F32LE	1
Max THD even VL23	460	F32LE	1
Max THD even VL31	462	F32LE	1
Max THD even AL1	464	F32LE	1
Max THD even AL2	466	F32LE	1
Max THD even AL3	468	F32LE	1
Max TDD tot AL1	470	F32LE	1
Max TDD tot AL2	472	F32LE	1
Max TDD tot AL3	474	F32LE	1
Min V L1-N	592	F32LE	1
Min V L2-N	594	F32LE	1
Min V L3-N	596	F32LE	1
Min V L-N Σ	598	F32LE	1
Min V L1-L2	600	F32LE	1
Min V L2-L3	602	F32LE	1
Min V L3-L1	604	F32LE	1
Min V L-L Σ	606	F32LE	1
Min A L1	608	F32LE	1
Min A L2	610	F32LE	1
Min A L3	612	F32LE	1
Min A N	614	F32LE	1
Min W L1	616	F32LE	1
Min W L2	618	F32LE	1
Min W L3	620	F32LE	1
Min W Σ	622	F32LE	1
Min VA L1	624	F32LE	1
Min VA L2	626	F32LE	1
Min VA L3	628	F32LE	1
Min VA Σ	630	F32LE	1
Min VAR L1	632	F32LE	1
Min VAR L2	634	F32LE	1
Min VAR L3	636	F32LE	1
Min VAR Σ	638	F32LE	1
Min PF L1	640	F32LE	1
Min PF L2	642	F32LE	1
Min PF L3	644	F32LE	1
Min PF Σ	646	F32LE	1
Min Hz	648	F32LE	1
Min Asymmetry L-N %	650	F32LE	1
Min Asymmetry L-L %	652	F32LE	1
Min K-Factor L1	656	F32LE	1
Min K-Factor L2	658	F32LE	1
Min K-Factor L3	660	F32LE	1
Min Temperature	662	F32LE	1
Min Analogue Input	664	F32LE	1
Min A Σ	666	F32LE	1
Min THD tot VL1-N	672	F32LE	1
Min THD tot VL2-N	674	F32LE	1
Min THD tot VL3-N	676	F32LE	1
Min THD tot VL12	678	F32LE	1
Min THD tot VL23	680	F32LE	1
Min THD tot VL31	682	F32LE	1
Min THD tot AL1	684	F32LE	1
Min THD tot AL2	686	F32LE	1
Min THD tot AL3	688	F32LE	1
Min THD odd VL1-N	690	F32LE	1
Min THD odd VL2-N	692	F32LE	1
Min THD odd VL3-N	694	F32LE	1
Min THD odd VL12	696	F32LE	1
Min THD odd VL23	698	F32LE	1
Min THD odd VL31	700	F32LE	1
Min THD odd AL1	702	F32LE	1
Min THD odd AL2	704	F32LE	1
Min THD odd AL3	706	F32LE	1
Min THD even VL1-N	708	F32LE	1
Min THD even VL2-N	710	F32LE	1
Min THD even VL3-N	712	F32LE	1
Min THD even VL12	714	F32LE	1
Min THD even VL23	716	F32LE	1
Min THD even VL31	718	F32LE	1
Min THD even AL1	720	F32LE	1
Min THD even AL2	722	F32LE	1
Min THD even AL3	724	F32LE	1
Min TDD tot AL1	726	F32LE	1
Min TDD tot AL2	728	F32LE	1
Min TDD tot AL3	730	F32LE	1
DMD V L1-N	848	F32LE	1
DMD V L2-N	850	F32LE	1
DMD V L3-N	852	F32LE	1
DMD V L-N Σ	854	F32LE	1
DMD V L1-L2	856	F32LE	1
DMD V L2-L3	858	F32LE	1
DMD V L3-L1	860	F32LE	1
DMD V L-L Σ	862	F32LE	1
DMD A L1	864	F32LE	1
DMD A L2	866	F32LE	1
DMD A L3	868	F32LE	1
DMD A N	870	F32LE	1
DMD W L1	872	F32LE	1
DMD W L2	874	F32LE	1
DMD W L3	876	F32LE	1
DMD W Σ	878	F32LE	1
DMD VA L1	880	F32LE	1
DMD VA L2	882	F32LE	1
DMD VA L3	884	F32LE	1
DMD VA Σ	886	F32LE	1
DMD VAR L1	888	F32LE	1
DMD VAR L2	890	F32LE	1
DMD VAR L3	892	F32LE	1
DMD VAR Σ	894	F32LE	1
DMD PF L1	896	F32LE	1
DMD PF L2	898	F32LE	1
DMD PF L3	900	F32LE	1
DMD PF Σ	902	F32LE	1
DMD Hz	904	F32LE	1
DMD Asymmetry L-N %	906	F32LE	1
DMD Asymmetry L-L %	908	F32LE	1
DMD A Σ / DMD K-Factor L1	912	F32LE	1
DMD K-Factor L2	914	F32LE	1
DMD K-Factor L3	916	F32LE	1
DMD Temperature	918	F32LE	1
DMD Analogue Input	920	F32LE	1
DMD A Σ	922	F32LE	1
DMD THD tot VL1-N	928	F32LE	1
DMD THD tot VL2-N	930	F32LE	1
DMD THD tot VL3-N	932	F32LE	1
DMD THD tot VL12	934	F32LE	1
DMD THD tot VL23	936	F32LE	1
DMD THD tot VL31	938	F32LE	1
DMD THD tot AL1	940	F32LE	1
DMD THD tot AL2	942	F32LE	1
DMD THD tot AL3	944	F32LE	1
DMD THD odd VL1-N	946	F32LE	1
DMD THD odd VL2-N	948	F32LE	1
DMD THD odd VL3-N	950	F32LE	1
DMD THD odd VL12	952	F32LE	1
DMD THD odd VL23	954	F32LE	1
DMD THD odd VL31	956	F32LE	1
DMD THD odd AL1	958	F32LE	1
DMD THD odd AL2	960	F32LE	1
DMD THD odd AL3	962	F32LE	1
DMD THD even VL1-N	964	F32LE	1
DMD THD even VL2-N	966	F32LE	1
DMD THD even VL3-N	968	F32LE	1
DMD THD even VL12	970	F32LE	1
DMD THD even VL23	972	F32LE	1
DMD THD even VL31	974	F32LE	1
DMD THD even AL1	976	F32LE	1
DMD THD even AL2	978	F32LE	1
DMD THD even AL3	980	F32LE	1
DMD TDD tot AL1	982	F32LE	1
DMD TDD tot AL2	984	F32LE	1
DMD TDD tot AL3	986	F32LE	1
DMD Max V L1-N	1104	F32LE	1
DMD Max V L2-N	1106	F32LE	1
DMD Max V L3-N	1108	F32LE	1
DMD Max V L-N Σ	1110	F32LE	1
DMD Max V L1-L2	1112	F32LE	1
DMD Max V L2-L3	1114	F32LE	1
DMD Max V L3-L1	1116	F32LE	1
DMD Max V L-L Σ	1118	F32LE	1
DMD Max A L1	1120	F32LE	1
DMD Max A L2	1122	F32LE	1
DMD Max A L3	1124	F32LE	1
DMD Max A N	1126	F32LE	1
DMD Max W L1	1128	F32LE	1
DMD Max W L2	1130	F32LE	1
DMD Max W L3	1132	F32LE	1
DMD Max W Σ	1134	F32LE	1
DMD Max VA L1	1136	F32LE	1
DMD Max VA L2	1138	F32LE	1
DMD Max VA L3	1140	F32LE	1
DMD Max VA Σ	1142	F32LE	1
DMD Max VAR L1	1144	F32LE	1
DMD Max VAR L2	1146	F32LE	1
DMD Max VAR L3	1148	F32LE	1
DMD Max VAR Σ	1150	F32LE	1
DMD Max PF L1	1152	F32LE	1
DMD Max PF L2	1154	F32LE	1
DMD Max PF L3	1156	F32LE	1
DMD Max PF Σ	1158	F32LE	1
DMD Max Hz	1160	F32LE	1
DMD Max Asymmetry L-N %	1162	F32LE	1
DMD Max Asymmetry L-L %	1164	F32LE	1
DMD Max K-Factor L1	1168	F32LE	1
DMD Max K-Factor L2	1170	F32LE	1
DMD Max K-Factor L3	1172	F32LE	1
DMD Max Temperature	1174	F32LE	1
DMD Max Analogue Input	1176	F32LE	1
DMD Max A Σ	1178	F32LE	1
DMD MAX THD tot VL1-N	1184	F32LE	1
DMD MAX THD tot VL2-N	1186	F32LE	1
DMD MAX THD tot VL3-N	1188	F32LE	1
DMD MAX THD tot VL12	1190	F32LE	1
DMD MAX THD tot VL23	1192	F32LE	1
DMD MAX THD tot VL31	1194	F32LE	1
DMD MAX THD tot AL1	1196	F32LE	1
DMD MAX THD tot AL2	1198	F32LE	1
DMD MAX THD tot AL3	1200	F32LE	1
DMD MAX THD odd VL1-N	1202	F32LE	1
DMD MAX THD odd VL2-N	1204	F32LE	1
DMD MAX THD odd VL3-N	1206	F32LE	1
DMD MAX THD odd VL12	1208	F32LE	1
DMD MAX THD odd VL23	1210	F32LE	1
DMD MAX THD odd VL31	1212	F32LE	1
DMD MAX THD odd AL1	1214	F32LE	1
DMD MAX THD odd AL2	1216	F32LE	1
DMD MAX THD odd AL3	1218	F32LE	1
DMD MAX THD even VL1-N	1220	F32LE	1
DMD MAX THD even VL2-N	1222	F32LE	1
DMD MAX THD even VL3-N	1224	F32LE	1
DMD MAX THD even VL12	1226	F32LE	1
DMD MAX THD even VL23	1228	F32LE	1
DMD MAX THD even VL31	1230	F32LE	1
DMD MAX THD even AL1	1232	F32LE	1
DMD MAX THD even AL2	1234	F32LE	1
DMD MAX THD even AL3	1236	F32LE	1
DMD MAX TDD tot AL1	1238	F32LE	1
DMD MAX TDD tot AL2	1240	F32LE	1
DMD MAX TDD tot AL3	1242	F32LE	1
Total KWh+	1280	U64LE	1
Total Kvarh+	1284	U64LE	1
Total KWh-	1288	U64LE	1
Total Kvarh-	1292	U64LE	1
Partial KWh+	1296	U64LE	1
Partial Kvarh+	1300	U64LE	1
Partial KWh-	1304	U64LE	1
Partial Kvarh-	1308	U64LE	1
Hours counter	1312	U64LE	1
Tariff 1 KWh+	1316	U64LE	1
Tariff 1 Kvarh+	1320	U64LE	1
Tariff 1 KWh-	1324	U64LE	1
Tariff 1 Kvarh-	1328	U64LE	1
Tariff 2 KWh+	1332	U64LE	1
Tariff 2 Kvarh+	1336	U64LE	1
Tariff 2 KWh-	1340	U64LE	1
Tariff 2 Kvarh-	1344	U64LE	1
Tariff 3 KWh+	1348	U64LE	1
Tariff 3 Kvarh+	1352	U64LE	1
Tariff 3 KWh-	1356	U64LE	1
Tariff 3 Kvarh-	1360	U64LE	1
Tariff 4 KWh+	1364	U64LE	1
Tariff 4 Kvarh+	1368	U64LE	1
Tariff 4 KWh-	1372	U64LE	1
Tariff 4 Kvarh-	1376	U64LE	1
Tariff 5 KWh+	1380	U64LE	1
Tariff 5 Kvarh+	1384	U64LE	1
Tariff 5 KWh-	1388	U64LE	1
Tariff 5 Kvarh-	1392	U64LE	1
Tariff 6 KWh+	1396	U64LE	1
Tariff 6 Kvarh+	1400	U64LE	1
Tariff 6 KWh-	1404	U64LE	1
Tariff 6 Kvarh-	1408	U64LE	1
C-1	1412	U64LE	1
C-2	1416	U64LE	1
C-3	1420	U64LE	1
Real Time tariff	1520	U16	1
Password	4096	U16	1
Electrical system selection	4097	U16	1
Application selection	4098	U16	1
Backlight colour	4099	U16	1
Backlight mode	4100	U16	1
Home page type	4101	U16	1
Home page - Line 2	4102	U16	1
Home page - Line 3	4103	U16	1
Home page - Line 4	4104	U16	1
Home page - Line 5	4105	U16	1
DMD - Calculation	4106	U16	1
DMD - Time interval	4107	U16	1
DMD - Synchronisation	4108	U16	1
LCD Bar-graph	4109	U16	1
Optical port Address	4110	U16	1
USART2_ModeSelection	4111	U16	1
(**) Optical port - baud rate selection	4112	U16	1
(**) Optical port - parity selection	4113	U16	1
Optical port - bit Stop	4114	U16	1
Factor K / K Factor selection	4115	U16	1
Display lock/unlock management	4116	U16	1
CT - Current transformer ratio	4120	F32LE	1
VT(PT) - Voltage transformer ratio	4122	F32LE	1
Nominal installed power	4124	F32LE	1
Filter Span parameter	4126	F32LE	1
Filter Coefficient	4128	F32LE	1
Low V reference for bar-graph	4130	F32LE	1
High V reference for bar-graph	4132	F32LE	1
Low A reference for bar-graph	4134	F32LE	1
High A reference for bar-graph	4136	F32LE	1
Low PF reference for bar-graph	4138	F32LE	1
High PF reference for bar-graph	4140	F32LE	1
Eddy (e) for K-Factor	4142	F32LE	1
Exponential constant (q) for K-Factor	4144	F32LE	1
Max. demand load current (IL) for TDD	4146	F32LE	1
Threshold current for Hours counter	4148	F32LE	1
Data Base system setup	4352	U16	1
Load profiling - Time interval selection	4353	U16	1
Load profiling – Variable selection	4354	U16	1
Clock format	4355	U16	1
Clock daylight-saving	4356	U16	1
Clock calendar: Year	4357	U16	1
Clock calendar: Month	4358	U16	1
Clock calendar: Day	4359	U16	1
Clock: Hour	4360	U16	1
Clock: Minutes	4361	U16	1
Clock: Seconds	4362	U16	1
Daylight-saving: month in which to increase the hour (+1H)	4363	U16	1
Daylight-saving: Sunday in which to increase the hour (+1H)	4364	U16	1
Daylight-saving: hour in which to increase the hour (+1H)	4365	U16	1
Daylight-saving: month in which to decrease the hour (-1H)	4366	U16	1
Daylight-saving: Sunday in which to decrease the hour (-1H)	4367	U16	1
Daylight-saving: hour in which to decrease the hour (-1H)	4368	U16	1
DMD Variable 1	4369	I16	1
DMD Variable 20	4388	I16	1
Calculation type enabling	4389	I16	1
Number of enabled variables	4390	I16	1
(**) RS485 instrument address selection	4400	U16	1
(**) RS485 baud rate selection	4401	U16	1
(**) RS485 parity selection	4402	U16	1
(**) RS485 Bit Stop	4403	U16	1
DB DMD - Time interval selection minute	4404	U16	1
IP Address (A.B.C.D)	4432	U16	1
Subnet mask (A.B.C.D)	4436	U16	1
Default Gateway (A.B.C.D)	4440	U16	1
Modbus TCP/IP port	4444	U16	1
Bacnet Port	4445	U16	1
Bacnet Device Instance Number (LSW)	4446	U16	1
Bacnet Device Instance Number (MSW)	4447	U16	1
Update Ethernet	4448	U16	1
Baud Rate	4449	U16	1
MAX_INFO_FRAMES	4450	U16	1
MAX_MASTER	4451	U16	1
MAC-Address	4452	U16	1
ACD (address conflict detect)	4453	U16	1
Foreign Device Enable	4455	U16	1
Ip address BBMD (A.B.C.D)	4456	U16	1
UDP Port	4460	U16	1
Re-register time (s)	4461	U16	1
Digital output channel 1: enabling	4864	U16	1
Digital output channel 1: output working mode	4865	U16	1
Digital output channel 1: linked alarm	4866	U16	1
Channel 1: linked counter variable	4867	U16	1
Digital output channel 1: pulse	4868	F32LE	1
Digital output channel 2: enabling	4870	U16	1
Digital output channel 2: output working mode	4871	U16	1
Digital output channel 2: linked alarm	4872	U16	1
Channel 2: linked counter variable	4873	U16	1
Digital output channel 2: pulse	4874	F32LE	1
Tariff from clock/input	5120	U16	1
Working days	5121	U16	1
Period 1: start	5122	U16	1
Period 1: stop	5123	U16	1
Period 2: start	5124	U16	1
Period 2: stop	5125	U16	1
Time Slot 1 (Period 1): start	5126	U16	1
Time Slot 1 (Period 1): stop	5127	U16	1
Linked tariff: Time Slot 1 - Period 1	5128	U16	1
Get clock values	12368	U16	1
Set clock values	12369	U16	1
External serial communication configuration updating	12370	U16	1
Optical serial communication configuration updating	12371	U16	1
Set/reset MOR2	12372	U16	1
Set/reset MO02	12373	U16	1
Set/reset MC232485	12374	U16	1
Stop DB DMD and unlock dmd area	12375	U16	1
Restart DB DMD and lock dmd area	12376	U16	1
Reset Bacnet Description to default value	12384	U16	1
Set clock values with hour and minute	12416	U16	1
Reset all remote outputs (MOR2 / MO02)	12544	U16	1
Remote output command on port 1	12545	U16	1
Remote output command on port 2	12546	U16	1
Set all remote outputs	12547	U16	1
Reset all remote outputs (MFI6O6 / MFI6R4)	12548	U16	1
Remote output command on port 3	12549	U16	1
Remote output command on port 4	12550	U16	1
Remote output command on port 5	12551	U16	1
Remote output command on port 6	12552	U16	1
Remote output command on port 7	12553	U16	1
Remote output command on port 8	12554	U16	1
Set all remote outputs	12555	U16	1
Reset all latch status	12624	U16	1
Reset V L1-N	12800	U16	1
Reset V L2-N	12801	U16	1
Reset V L3-N	12802	U16	1
Reset V L-N Σ	12803	U16	1
Reset V L1-L2	12804	U16	1
Reset V L2-L3	12805	U16	1
Reset V L3-L1	12806	U16	1
Reset V L-L Σ	12807	U16	1
Reset A L1	12808	U16	1
Reset A L2	12809	U16	1
Reset A L3	12810	U16	1
Reset A N	12811	U16	1
Reset W L1	12812	U16	1
Reset W L2	12813	U16	1
Reset W L3	12814	U16	1
Reset W Σ	12815	U16	1
Reset VA L1	12816	U16	1
Reset VA L2	12817	U16	1
Reset VA L3	12818	U16	1
Reset VA Σ	12819	U16	1
Reset VAR L1	12820	U16	1
Reset VAR L2	12821	U16	1
Reset VAR L3	12822	U16	1
Reset VAR Σ	12823	U16	1
Reset PF L1	12824	U16	1
Reset PF L2	12825	U16	1
Reset PF L3	12826	U16	1
Reset PF Σ	12827	U16	1
Reset Hz	12828	U16	1
Reset Asymmetry L-N %	12829	U16	1
Reset Asymmetry L-L %	12830	U16	1
Reset A Σ / Reset K Factor L1	12832	U16	1
Reset K Factor L2	12833	U16	1
Reset K Factor L3	12834	U16	1
Reset Temperature	12835	U16	1
Reset analogue input	12836	U16	1
Reset A Σ	12837	U16	1
Reset Total KWh+	13568	U16	1
Reset Total Kvarh+	13569	U16	1
Reset Total KWh-	13570	U16	1
Reset Total Kvarh-	13571	U16	1
Reset Partial KWh+	13572	U16	1
Reset Partial Kvarh+	13573	U16	1
Reset Partial KWh-	13574	U16	1
Reset Partial Kvarh-	13575	U16	1
Reset Run Hours	13576	U16	1
Reset DB - DMD	13824	U16	1
Reset DB - Events	13825	U16	1
Reset DB - Load profiling	13826	U16	1
Virtual alarm	16384	U16	1
Output (port)	16385	U16	1
HW modules configuration	16386	U16	1
Input (port)	16387	U16	1
Output setup (port)	16388	U16	1
Input previous state	16389	U16	1
HW modules configuration 2	16390	U16	1

link settings as documented (unverified): RTU; baud 9600/19200/38400/115200; FC 03,04,06,08,16,20,66; Supports broadcast mode on address 00h for write functions 06h and 10h.

bench facts as documented (unverified)

termination	To avoid errors due to the signal reflections or line coupling, it is necessary to terminate the input of the last instrument on the network, and also the reception of the Host.
shield/ground	The GND connection is optional if a shielded cable is used.
wiring notes	For connections longer than 1000 m, a line amplifier is necessary.
max registers/read	125
response timeout	1000 ms
inter-frame delay	2 ms
broadcast	supported
protocol notes	Typical answering time is 23 ms @ 9600 bps and <4 ms @ 115200 bps.
model register	300001
serial register	300033
firmware register	300001
FC 43 device ID	not supported
doc revision	4.0

field reports — community-sourced, unverified (checked 2026-06-11)

For reliable communication and to read/write on all registers, third-party integration guides recommend setting the inter-frame delay (or request delay) to 300 ms or higher. [source]
Users have reported that the Ethernet/IP communication module (MC EI) for the WM30/WM40 drops connections randomly and fails to re-establish them without a power cycle. [source]
confirmed: Baud rates [9600, 19200, 38400, 115200] and framing [RTU] — confirmed by Carlo Gavazzi WM20-WM30-WM40 Communication Protocol manual
confirmed: Function codes [3, 4, 6, 8, 16, 20, 66] — confirmed by manual (where 20 is 14h 'Read record file' and 66 is 42h 'Read Special Registers')
confirmed: Broadcast mode on address 00h for write functions 06h and 10h — confirmed by manual
confirmed: Identification registers (firmware/model at 300001, serial at 300033) — confirmed by manual
confirmed: Physical notes regarding 1000m line amplifier, optional shield ground, and termination — confirmed by manual
confirmed: Typical answering times (23 ms @ 9600 bps, <4 ms @ 115200 bps) and max response timeout (1000 ms) — confirmed by manual
confirmed: Register map addresses (v_l1_n @ 80, v_l2_n @ 82, ..., analogue_input @ 152) — confirmed by manual

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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