Skip to main content

Wattnode BACnet

WattNode® BACnet® — Downloads

Sales Brochure

These downloads apply to the following two families of WattNode meters for the BACnet protocol:

Manuals and Technical Documents

Short and long versions of manuals are available and apply to both the WattNode BACnet and WattNode Revenue for BACnet models.

Installation Guide

The short Installation Manual is intended for the electrician, contractor, or anyone installing network cabling.

Installation and Reference Manual

The longer Installation and Reference Manual is intended for programmers, designers, and installers.

Prior Versions

Firmware Updates

The WattNode BACnet production firmware version is periodically updated. The firmware can be field upgraded or the WattNode meter may be returned to the factory for firmware updates. There is a nominal charge for factory firmware updates unless they are needed to fix a bug under warranty. Unless you are experiencing problems, there is generally no reason to update the firmware.

See WattNode BACnet Versions for the full list of versions.

BACnet is a registered trademark of ASHRAE.


The WattNode® for BACnet® (MS/TP) is a multi-function electric 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 600 Vac and currents from 5 to 6,000 amps in delta (phase to phase) and wye (phase to neutral) configurations.

Listed by BACnet Testing Laboratories

BACnet is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of BACnet International’s BACnet Testing Laboratories (BTL). BTL® is a registered trademark of BACnet International.

Diagnostic LEDs

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 BACnet 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.


  • 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 average of all phases)
  • True RMS Energy: Kilo-Watthours kWh (Phase A, B, C, and sum of all phases)
  • Reactive Energy: kVAR-hours (Phase A, B, C)
  • AC Line Frequency
  • RMS Voltage: (Average and Phase A, B, C; line-to-line and line-to-neutral)
  • Computed RMS Current: (Phase A, B, C)
  • Demand
  • Peak Demand

WattNode® BACnet® – Features

WNC BN Model RWNC BN Model Features
Meets ANSI C12.1 accuracy requirements when used with Accu-CT Class 0.6 current transformers.
Small form factor for easy installation inside most electrical panels, see a sample
installation diagram
Pluggable screw terminals for easy wiring
Nominal accuracy 0.5% (see Installation and Operation Manual for details )
True RMS power even with leading or lagging power factor and chopped or distorted waveforms
Measure variable speed motor drives used in HVAC, refrigeration, and pumping systems
Safe CT’s (current transformers), output 0.333 Vac at rated current.

  • Split core CTs for quick installation
  • Solid core CTs are less expensive and prevent tampering
  • CTBL large split-core CTs for high currents (standard and custom sizes)
  • CTRC Rogowski Coils for tight spaces where rigid CTs do not fit
UL, cUL Listed, CE Mark—Designed and tested for safety and use throughout North America and the European Union.
Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
Five year warranty

WattNode® BACnet® – Specifications

BACnet Communication

  • Protocol: BACnet MS/TP (RS-485)
  • Baud Rates: 9600, 19200, 38400, and 76800 baud
  • Duplex: Half (two-wire plus common)
  • Parity (default): N81 (no parity, eight data bits, one stop bit)
  • BACnet Buffer: 512 bytes (480 byte maximum APDU length)

EIA RS-485 Interface

  • Driver Output Voltage (Open Circuit): ± 6 Vdc maximum
  • Driver Output Voltage (54Ω load): ± 1.5 Vdc minimum
  • Driver Output Current (54Ω load): ± 60 mA typical
  • Driver Output Rise Time (54Ω || 50 pF load): 900 nS typical
  • Receiver Common-Mode Voltage Range: –7 to +12 Vdc maximum
  • Receiver Sensitivity: ±200 mV
  • Receiver Bus Load: 1/8 unit load


  • Line powered
  • Operating Voltage Range: –20% to +15% of nominal
  • Power Line Frequency: 50 or 60 Hz
  • CT Input: 0.333 Vac nominal, 0 to 0.5 Vac operating, 3 Vac maximum
  • Optional Temperature Input: see WattNode BACnet Option TM1 Specifications

Measurement Configurations

  • Single phase: two or three wire
  • Three phase: four wire wye
  • Three phase: three wire delta
  • Three phase: four wire delta


WattNode BACnet

WattNode Revenue BACnet

  • 0.5% nominal (see WNC BACnet Manual for details)
  • Meets accuracy requirements of the ANSI C12.1 standard when used with CCS CTs rated for IEEE C57.13 class 0.6 accuracy (see Revenue Grade CTs).


  • Listed by BACnet Testing Laboratories (BTL)
  • FCC Class B, EN 55022 Class B
  • UL and cUL Listed (UL 61010-1), file number E312220
  • CE mark and RoHS: Declaration of Conformity
  • Immunity: EN 61326: 2002 (Industrial Locations)


  • Operating Temperature: -40°C to +75°C (-40°F to 167°F)
  • Altitude: Up to 2000 m (6560 ft)
  • Operating Humidity: 5 to 90% relative humidity (RH) up to 40°C, decreasing linearly to 50% RH at 55°C.
  • Pollution: POLLUTION DEGREE 2 – Normally only non-conductive pollution; occasionally, a temporary conductivity caused by condensation must be expected.
  • Indoor Use: Suitable for indoor use.
  • Outdoor Use: Suitable for outdoor use when mounted inside an electrical enclosure (Hammond Mfg., Type EJ Series) that is rated NEMA 3R or 4.



Case Dimensions

(Click on the image for a larger view.)

  • Enclosure:
    • High impact, ABS plastic
    • Flame Resistance Rating: 94V-0, IEC FV-0
    • Size: 5.63 × 3.34 × 1.5 in. (143 × 85 × 38 mm)
    • Weight: 10.8 oz (305 g)
  • Connectors: Euroblock style pluggable screw terminal blocks
    • Green: 22 to 12 AWG (1.0 to 2.5 mm), 600 V
    • Black: 22 to 12 AWG (1.0 to 2.5 mm), 300 V
    • Screw torque 4.4 lbf·in (0.5 N·m)

BACnet is a registered trademark of ASHRAE.

WattNode® BACnet® – Model Part Numbers

Standard Model Revenue Model Vac Line
to Neutral
Vac Line
to Line
Service Types
120 208-240 Single-Phase 120V with neutral
Single-Phase 3-Wire 120/240V
3-Phase 4-Wire Wye 120/208V
230 400 Single-Phase 230V with neutral
3-Phase 4-Wire Wye 230/400V
277 480 Single-Phase 277V with neutral
3-Phase 4-Wire Wye 277/480V
347 600 Single-Phase 347V with neutral
3-Phase 4-Wire Wye 347/600V
See below 208-240 Single-Phase 208V (No neutral)
Single-Phase 240V (No neutral)
Single-Phase 3-Wire 120/240V
3-Phase 3-Wire Delta 208V–240V (No neutral)
3-Phase 4-Wire Wye 120/208V
See below 400 3-Phase 3-Wire Delta 400V (No neutral)
3-Phase 4-Wire Wye 230/400V
See below 480 3-Phase 3-Wire Delta 480V (No neutral)
3-Phase 4-Wire Wye 277/480V
  • Voltage Ranges listed in table are -20% to +15% of nominal. For 3D-240 models, this is -20% of 208 Vac (166 Vac) to +15% of 240 Vac (276 Vac). Operating Frequencies: 50/60 Hz
  • Delta models (3D in part number) work either with or without a neutral connection, but require a line-to-line voltage connection for operating power.
  • For a list of available options see the BACnet Options tab, call (303) 444-7422 or email for option pricing.

WattNode® BACnet® – Options

The WattNode® BACnet® and WattNode Revenue BACnet meters are available with factory options at an additional charge. See the WattNode BACnet Manual (PDF 57 pages) for more information.

General Options

  • Option CT
    • Option CT=xxx – Pre-assign xxx to CtAmpsA, CtAmpsB, and CtAmpsC.
    • Option CT=xxx/yyy/zzz – Pre-assign xxx to CtAmpsA, yyy to CtAmpsB, and zzz to CtAmpsC.
  • Option TM1 – Configure the meter for use with a 10k thermistor between the C and X terminals. This allows the meter to measure temperatures from -50°C to 150°C and report the temperature with a BACnet Analog Input object. Note that this option requires firmware version 1.20, which is not BTL certified. See the reference manual for more details and specifications.

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

BACnet is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)