Continental Control Systems WattNode WNC (Modbus variant)

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	unit
Dummy	0	I32LE	1
EnergySum	1000	F32LE	1	kWh
EnergyPosSum	1002	F32LE	1	kWh
EnergySumNR	1004	F32LE	1	kWh
EnergyPosSumNR	1006	F32LE	1	kWh
PowerSum	1008	F32LE	1	W
PowerA	1010	F32LE	1	W
PowerB	1012	F32LE	1	W
PowerC	1014	F32LE	1	W
VoltAvgLN	1016	F32LE	1	V
VoltA	1018	F32LE	1	V
VoltB	1020	F32LE	1	V
VoltC	1022	F32LE	1	V
VoltAvgLL	1024	F32LE	1	V
VoltAB	1026	F32LE	1	V
VoltBC	1028	F32LE	1	V
VoltAC	1030	F32LE	1	V
Freq	1032	F32LE	1	Hz
EnergyA	1100	F32LE	1	kWh
EnerygB	1102	F32LE	1	kWh
EnergyC	1104	F32LE	1	kWh
EnergyPosA	1106	F32LE	1	kWh
EnergyPosB	1108	F32LE	1	kWh
EnergyPosC	1110	F32LE	1	kWh
EnergyNegSum	1112	F32LE	1	kWh
EnergyNegSumNR	1114	F32LE	1	kWh
EnergyNegA	1116	F32LE	1	kWh
EnergyNegB	1118	F32LE	1	kWh
EnergyNegC	1120	F32LE	1	kWh
EnergyReacSum	1122	F32LE	1	kVARh
EnergyReacA	1124	F32LE	1	kVARh
EnergyReacB	1126	F32LE	1	kVARh
EnergyReacC	1128	F32LE	1	kVARh
EnergyAppSum	1130	F32LE	1	kVAh
EnergyAppA	1132	F32LE	1	kVAh
EnergyAppB	1134	F32LE	1	kVAh
EnergyAppC	1136	F32LE	1	kVAh
PowerFactorAvg	1138	F32LE	1
PowerFactorA	1140	F32LE	1
PowerFactorB	1142	F32LE	1
PowerFactorC	1144	F32LE	1
PowerReacSum	1146	F32LE	1	VAR
PowerReacA	1148	F32LE	1	VAR
PowerReacB	1150	F32LE	1	VAR
PowerReacC	1152	F32LE	1	VAR
PowerAppSum	1154	F32LE	1	VA
PowerAppA	1156	F32LE	1	VA
PowerAppB	1158	F32LE	1	VA
PowerAppC	1160	F32LE	1	VA
CurrentA	1162	F32LE	1	A
CurrentB	1164	F32LE	1	A
CurrentC	1166	F32LE	1	A
Demand	1168	F32LE	1	W
DemandMin	1170	F32LE	1	W
DemandMax	1172	F32LE	1	W
DemandApp	1174	F32LE	1	W
DemandA	1176	F32LE	1	W
DemandB	1178	F32LE	1	W
DemandC	1180	F32LE	1	W
EnergySum	1200	I32LE	0.1	kWh
EnergyPosSum	1202	I32LE	0.1	kWh
EnergySumNR	1204	I32LE	0.1	kWh
EnergyPosSumNR	1206	I32LE	0.1	kWh
PowerSum	1208	I16	1
PowerA	1209	I16	1
PowerB	1210	I16	1
PowerC	1211	I16	1
VoltAvgLN	1212	I16	0.1	V
VoltA	1213	I16	0.1	V
VoltB	1214	I16	0.1	V
VoltC	1215	I16	0.1	V
VoltAvgLL	1216	I16	0.1	V
VoltAB	1217	I16	0.1	V
VoltBC	1218	I16	0.1	V
VoltAC	1219	I16	0.1	V
Freq	1220	I16	0.1	Hz
EnergyA	1300	I32LE	0.1	kWh
EnerygB	1302	I32LE	0.1	kWh
EnergyC	1304	I32LE	0.1	kWh
EnergyPosA	1306	I32LE	0.1	kWh
EnergyPosB	1308	I32LE	0.1	kWh
EnergyPosC	1310	I32LE	0.1	kWh
EnergyNegSum	1312	I32LE	0.1	kWh
EnergyNegSumNR	1314	I32LE	0.1	kWh
EnergyNegA	1316	I32LE	0.1	kWh
EnergyNegB	1318	I32LE	0.1	kWh
EnergyNegC	1320	I32LE	0.1	kWh
EnergyReacSum	1322	I32LE	0.1	kVARh
EnergyReacA	1324	I32LE	0.1	kVARh
EnergyReacB	1326	I32LE	0.1	kVARh
EnergyReacC	1328	I32LE	0.1	kVARh
EnergyAppSum	1330	I32LE	0.1	kVAh
EnergyAppA	1332	I32LE	0.1	kVAh
EnergyAppB	1334	I32LE	0.1	kVAh
EnergyAppC	1336	I32LE	0.1	kVAh
PowerFactorAvg	1338	I16	0.01
PowerFactorA	1339	I16	0.01
PowerFactorB	1340	I16	0.01
PowerFactorC	1341	I16	0.01
PowerReacSum	1342	I16	1
PowerReacA	1343	I16	1
PowerReacB	1344	I16	1
PowerReacC	1345	I16	1
PowerAppSum	1346	I16	1
PowerAppA	1347	I16	1
PowerAppB	1348	I16	1
PowerAppC	1349	I16	1
CurrentA	1350	I16	1
CurrentB	1351	I16	1
CurrentC	1352	I16	1
Demand	1353	I16	1
DemandMin	1354	I16	1
DemandMax	1355	I16	1
DemandApp	1356	I16	1
DemandA	1357	I16	1
DemandB	1358	I16	1
DemandC	1359	I16	1
IoPinState	1360	I16	1
PulseCount	1361	I16	1
ConfigPasscode	1600	I32LE	1
CtAmps	1602	I16	1	A
CtAmpsA	1603	I16	1	A
CtAmpsB	1604	I16	1	A
CtAmpsC	1605	I16	1	A
CtDirections	1606	I16	1
Averaging	1607	I16	1
PowerIntScale	1608	I16	1	W
DemPerMins	1609	I16	1	minute
DemSubints	1610	I16	1
GainAdjustA	1611	I16	0.0001
GainAdjustB	1612	I16	0.0001
GainAdjustC	1613	I16	0.0001
PhaseAdjustA	1614	I16	0.001	deg
PhaseAdjustB	1615	I16	0.001	deg
PhaseAdjustC	1616	I16	0.001	deg
CreepLimit	1617	I16	1
PhaseOffset	1618	I16	1	degree
ZeroEnergy	1619	I16	1
ZeroDemand	1620	I16	1
CurrentIntScale	1621	I16	1
IoPinMode	1622	I16	1
ApplyComConfig	1650	I16	1
Address	1651	I16	1
BaudRate	1652	I16	1
ParityMode	1653	I16	1
ModbusMode	1654	I16	1
ReplyDelay	1655	I16	1
SerialNumber	1700	I32LE	1
UptimeSecs	1702	I32LE	1	Seconds
TotalSecs	1704	I32LE	1	Seconds
Model	1706	I16	1
Version	1707	I16	1
Options	1708	I16	1
ErrorStatus	1709	I16	1
PowerFailCount	1710	I16	1
CrcErrorCount	1711	I16	1
FrameErrorCount	1712	I16	1
PacketErrorCount	1713	I16	1
OverrunCount	1714	I16	1
ErrorStatus1	1715	I16	1
ErrorStatus2	1716	I16	1
ErrorStatus3	1717	I16	1
ErrorStatus4	1718	I16	1
ErrorStatus5	1719	I16	1
ErrorStatus6	1720	I16	1
ErrorStatus7	1721	I16	1
ErrorStatus8	1722	I16	1
OptCtAmpsA	1723	I16	1
OptCtAmpsB	1724	I16	1
OptCtAmpsC	1725	I16	1
OptModbusMode	1726	I16	1
OptAddress	1727	I16	1
OptBaudRate	1728	I16	1
OptParityMode	1729	I16	1
Opt232	1730	I16	1
OptTTL	1731	I16	1
OptIO	1732	I16	1
OptX5	1733	I16	1
OptSSR	1734	I16	1
OptIoPinMode	1735	I16	1

link settings as documented (unverified): RTU; default 9600 8N1; FC 03,04,06,16,17; Defaults to 8 data bits, no parity, and one stop bit. Parity can be configured to even (E81) with Option EP or ParityMode register.

bench facts as documented (unverified)

terminals	Green screw terminals for voltage inputs (up to 12 AWG), black screw terminals for CT inputs, and Modbus terminals (A-, B+, C, X).
A/B polarity	Auto-detects RS-485 polarity on properly biased networks.
termination	Requires 120 ohm termination resistors at both ends of the bus for longer networks.
connector	Euroblock style pluggable terminal blocks.
isolation	Modbus terminals are completely isolated (4500 Vac RMS isolation) from dangerous voltages.
shield/ground	Connect cable shield or Modbus common to earth ground at just the Modbus master end.
inter-frame delay	3 ms
broadcast	supported
model register	1707
serial register	1701
firmware register	1708
FC 43 device ID	not supported
power	Powered from line voltage inputs: ØA to N for wye models, or ØA to ØB for delta models. Power consumption typically 1.0 to 1.6 W (3 to 4 VA).
environment	Operating temperature: -30°C to +55°C. Humidity: 5% to 90% RH non-condensing. Pollution degree 2. Indoor use or outdoor in NEMA 3R/4 enclosure.
accuracy	±0.5% of reading under normal operation (Condition 1).
certifications	UL 61010-1, CAN/CSA-C22.2 No. 61010-1-04, IEC 61010-1, EN 61326: 2002, FCC Part 15 Class B, EN 55022: 1994 Class B.
doc revision	Rev 1.18c
firmware applicability	Firmware Versions 18-24

⚠ disputed: inter_frame_delay_ms: 3 — disputed by WattNode Modbus Installation and Operation Manual (Rev 1.18c) which states that the inter-frame silent interval is baud-rate dependent (3.6 ms at 9600 baud, ~2 ms at 19200 baud) rather than a fixed 3 ms.

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

In firmware versions V14 through V22, at 9600 baud, the meter only allowed a maximum silent gap of 0.75 ms between bytes when receiving messages, causing messages to be ignored if a master inserted gaps longer than that (the Modbus standard permits up to 1.5 character times or 1.56 ms). Fixed in V23/V26. [source]
In firmware versions V16 through V22, the meter reported zero for energies, power, voltage, and other measurements during the first second of operation. Fixed in V23. [source]
In firmware version V22, the meter reported zero for energies during the first second of operation. Fixed in V23/V26. [source]
confirmed: Baud rates [1200, 2400, 4800, 9600, 19200, 38400] and default baud rate of 9600 — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Modbus RTU framing and supported function codes [3, 4, 6, 16, 17] — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Accuracy of ±0.5% of reading under normal operation (Condition 1) — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Certifications (UL 61010-1, CAN/CSA-C22.2 No. 61010-1-04, IEC 61010-1, EN 61326: 2002, FCC Part 15 Class B, EN 55022: 1994 Class B) — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Auto-detection of RS-485 polarity on properly biased networks — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Shield grounding recommendation to connect shield to earth ground at just the Modbus master end — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)
confirmed: Register map summary (0-based addresses matching 1-based registers in manual) — confirmed by WattNode Modbus Installation and Operation Manual (Rev 1.18c)

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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