Support Center

Welcome to the Continental Control Systems’ support pages. This section contains articles to assist with installing, configuring, troubleshooting, and using our WattNode meter and current transformer products. Information on other products, accessories, and services that are sold by other companies that work with WattNode products are also list here.
Revenue Grade AC Power Measurement
for Modbus Networks,
True Power, kWh
Reactive Power,
VARs, Power Factor,
Individual Phase Measurements
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WattNode Revenue Modbus

The WattNode Revenue with Modbus interface is a revenue grade kilowatt hour (kWh) energy and power meter that communicates on a EIA RS-485 network, measures 1, 2, or 3 phases with voltages from 120 to 480 volts Vac. When used with Accu-CT Class 0.6 current transformers it meets the accuracy requirements of ANSI C12.1. All WattNode Revenue meters are supplied with a certificate of calibration.

Diagnostic LEDs

Our diagnostic LEDs provide a per-phase indication of power (green flashing) and negative power (red flashing) to help troubleshoot connection problems, like reversed CTs, or excessive line voltage. The WattNode Modbus meter also has a red/yellow/green communication LED to indicate traffic, configuration problems, bus contention and other conditions. See the manual for full descriptions.


  • Supports floating point and integer registers
  • True RMS Power: Watts (Phase A, B, C, and sum of all phases)
  • Reactive Power: VARs (Phase A, B, C, and sum of all phases)
  • Power Factor: (Phase A, B, C, and sum of all phases)
  • True RMS Energy: Kilo-Watthours kWh (Phase A, B, C, and sum of all phases)
  • Reactive Energy: kVAR-hours (All Phases)
  • AC Line Frequency
  • RMS Voltage: (Phase A, B, C)
  • Computed RMS Current: (Phase A, B, C)
  • Demand
  • Peak Demand


  • Meets ANSI C12.1 for use in revenue grade metering
  • CT rated amps value locked and cannot be changed to prevent tampering
  • Small form factor for easy installation inside most electrical panels, see a sample installation diagram
  • Pluggable screw terminals for easy wiring
  • 0.5% accuracy nominal (see manual for details)
  • True RMS power even with leading or lagging power factor and chopped or distorted waveforms
  • Measure variable speed drive pumps and motors
  • Safe 0.333 Vac output revenue grade split-core CTs with outstanding linearity, low 0.5° phase angle error, and accuracy down to 1% of full scale
  • UL, cUL Listed – Designed and tested for safety and use throughout North America.
  • Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
  • Five year warranty

Safety Note

Warning: Hazardous Voltages – Only qualified personnel or licensed electricians should install the WattNode meter and current transformers.

Modbus is a registered trademark of Modbus Organization, Inc.

Keywords: C12

in WattNode Modbus