verified connector library

Continental Control Systems WattNode WNC (Modbus variant)

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

pointaddress (0-based)typescaleunit
energy_sum1000F32LE1kWh
energy_pos_sum1002F32LE1kWh
power_sum1008F32LE1W
power_a1010F32LE1W
power_b1012F32LE1W
power_c1014F32LE1W
volt_avg_ln1016F32LE1V
volt_a1018F32LE1V
volt_b1020F32LE1V
volt_c1022F32LE1V
volt_avg_ll1024F32LE1V
volt_ab1026F32LE1V
volt_bc1028F32LE1V
volt_ac1030F32LE1V
freq1032F32LE1Hz
power_factor_avg1138F32LE1
power_factor_a1140F32LE1
power_factor_b1142F32LE1
power_factor_c1144F32LE1
power_reac_sum1146F32LE1
power_app_sum1154F32LE1
current_a1162F32LE1
current_b1164F32LE1
current_c1166F32LE1

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)
terminalsGreen screw terminals for voltage inputs (up to 12 AWG), black screw terminals for CT inputs, and Modbus terminals (A-, B+, C, X).
A/B polarityAuto-detects RS-485 polarity on properly biased networks.
terminationRequires 120 ohm termination resistors at both ends of the bus for longer networks.
connectorEuroblock style pluggable terminal blocks.
isolationModbus terminals are completely isolated (4500 Vac RMS isolation) from dangerous voltages.
shield/groundConnect cable shield or Modbus common to earth ground at just the Modbus master end.
inter-frame delay3 ms
broadcastsupported
model register1707
serial register1701
firmware register1708
FC 43 device IDnot supported
powerPowered 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).
environmentOperating 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).
certificationsUL 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 revisionRev 1.18c
firmware applicabilityFirmware Versions 18-24

generated by gemini:gemini-3.5-flash · harvested from https://ctlsys.com/wp-content/uploads/2016/10/WNC-Modbus-Manual-V18c.pdf (Continental Control Systems); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

The trust ladder

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