Surface Mount / Weatherproof

  • Non-metallic surface mounting with lockable latch
  • ETL Listed, CE, BTL Listed, SunSpec certified
  • 208V – 480V ac, L-L (1P 2W, 1P 3W, 3P 3W or 4W)
  • 600V ac, L-L, 4 W (option)
  • Ethernet, RS-485 and Pulse (kWh) connectivity
  • Modbus TCP, and BACnet/IP protocols loaded as default, SNMP or DNP 3.0
  • Modbus RTU and BACnet MS/TP protocols loaded as default, LonWorks
  • Pulse output models approved for VRF / VRV applications
  • 333mV or 5A CT inputs
  • 333mV models can be field selectable for 333mV or Rogowski CTs (NO integrator required)
  • Up to 3 x 333mV CT inputs per phase using option bd CPCC-1172 ML
  • Bi-directional for renewable systems (NET metering)
  • Standard Fused Voltage Terminals, Pulse Output
  • Options include: Digital Input/Outputs
  • Made in USA
  • The specifications above are model dependent.

The selection fields below are in the same order as the “Model Number Builder” on page 2 of the DTS SMX datasheet (1.2 Mb) [PDF]

DTS SMX – ab – cd – e – f

Data Sheets & Downloads


DTS SMX Datasheet (1.2 Mb) [PDF]
MLG-WCT 333mV split core CT datasheet (1.3 Mb) [PDF]
MLG-WRT Rogowski CT datasheet (230 Kb) [PDF]
MLG-RCT- Flexible Rogowski CT datasheet (385.5 Kb) [PDF]


DTS SMX – Installation Guide (2.2 Mb) [PDF]
Configuring AC and DC Current Sensors (308.7 Kb) [PDF]
DTS RS-485 Meter Setup using DTS Config & CCOM-0017 (1.7 Mb) [PDF]
RS-485 Cabling Requirements for Modbus RTU and BACnet MSTP (161.3 Kb) [PDF]
Guide for Extending CT Cable Length (118.6 Kb) [PDF]
Using Multiple CT Sets with DTS Meters (681.6 Kb) [PDF]
Configuring Digital IO using DTS Config (621.5 Kb) [PDF]


Download DTS Config (Modbus ONLY) (2 Mb) [ZIP]
Download DTS Toolbox (9.2 Mb) [ZIP]
Changing IP settings for an Ethernet based DTS meter (1.4 Mb) [PDF]
BACnet Explorers – 3rd party tools

View Software / Drivers page for more details & current version info.

DTS Modbus Map (732.5 Kb) [PDF]
DTS Modbus Addendum (SunSpec) (353.9 Kb) [PDF]
DTS BACnet MS/TP Map (539.8 Kb) [PDF]
DTS BACnet/IP Map (182.2 Kb) [PDF]
DTS LonWorks Map (274.7 Kb) [PDF]
DTS SNMP Map (146.1 Kb) [PDF]
— DTS AC Meters MIB File (2 Kb) [ZIP]
— DTS DC Meters MIB File (986 B) [ZIP]
DTS DNP 3.0 Map (157.1 Kb) [PDF]

DTS Logging System (308 Kb) [PDF]

Product Description

The DTS SMX is a weather-proof energy sub-meter that operates in any environment. It is easy to install and is designed to mount on any surface; providing the most accurate data acquisition. This meter works with all “safe” 333mV, 5A or flexible Rogowski current transformers (CTs) and requires no external power source to operate. A backlit LCD display provides local visibility to the measured parameters.

This meter has some exciting features, including field configurable DIP switches, Fused Voltage Terminals, Auto-topology Phase Detection, on-board CT Reverse Algorithms for automatic correction of improper field mounted CTs; all contained in a weatherproof surface mounted enclosure. For remote configuration, the DTS SMX comes with our free DTS Config software platform; conveniently choose from over 200 parameters at the frequency you require.

Whether communicating via an RS-485 or Ethernet connection, the DTS SMX supports most accepted protocols, including Modbus RTU, Modbus TCP, BACnet MS/TP, BACnet/IP, SNMP, DNP 3.0 or LonWorks (model dependent). It easily integrates with Building Automation Systems and Energy Monitoring Software. Also, if you decide to integrate renewable energy sources in the future, the DTS SMX will conveniently operate as a Bi-directional NET meter. It is Designed and Manufactured in the USA and complies with the Buy American Provisions of ARRA Section 1605.


  • Line powered single / three phase energy submeter
  • NEMA 4x weather-proof surface mount enclosure
  • Bi-directional for renewable systems (NET metering)
  • Interfaces with “safe” 333mV, flexible Rogowski CTs or 1/5A CTs
  • Up to 3 x 333mV CT inputs per phase using option board CPCC-1172 ML
  • Fused Voltage Terminals included for quick installation
  • Easy access voltage and current terminations
  • CT ratio set by DIP switches
  • Embedded Ethernet connectivity – Modbus/TCP, BACnet/IP, SNMP or DNP 3.0
  • RS-485 connectivity – Modbus RTU or BACnet MS/TP
  • Communications setting via DIP switches for Modbus RTU
  • LonWorks FT-10 communications
  • Pulse output standard
  • Pulse output models approved for VRF / VRV applications
  • 2 digital status/counter inputs OR digital outputs – optional
  • User configurable using DTS Config software
  • User-definable Modbus register area
  • Compatible with Energy Management Software suites
  • SunSpec Alliance certified
  • Designed and Manufactured in the USA. Complies with the Buy American Provisions of ARRA Section 1605

** CTs excluded


Measuring Circuits

Voltage range: 208-480V ac, L-L, 3 or 4 W, 600V 4W option
Rated voltage: 280 Vac L-N / 485 Vac L-L , 347 Vac L-N
Voltage overload: 1.2 x
Voltage burden: <0.1 VA @ 280 V ac L-N
Frequency: 45 to 65 Hz
Rated current: 1A to 5A isolated
333 mV for mV or Rogowski CT versions
Current overload: 1.5 x for 1A or 5A versions
1.2 x for mV versions
Current input burden: 0.5 VA @ 5 A
Power overload: 1.2 x


Voltage: 0.5%, <0.2% typical (80-120%)
Current: 0.5%, <0.2% typical (10-120%)
Power: 0.5%, <0.2% typical (10-120%)
Power Factor: 0.5% (between 0.5 and 1.0)
Energy:** Class 0.5 (ANSI C12.20)


Connection: #6-32 screw terminals with captive washers
Case Material: Polycarbonate
Protection: Nema 4x
Dimensions: 11.45”(291mm) H x 4.92”(125mm) D x 8.98”(228mm) W
Weight: 3.75lbs (1.7 kg)

Voltage Supply

Voltage: Powered from Phase A & B or Phase A & Neutral (model dependent)
Frequency: 50/60 Hz
Tolerance: -10%, + 10%
Burden: <5VA
Operating temp: -4º to 158ºF (-20º to 70ºC)
Storage temp: -40º to 185ºF (-40º to 85ºC)
Humidity: 5 to 95% R.H. non-condensing

Communications (Serial)

Connection: 3 way pluggable, screw terminal
Protocols: Modbus RTU or BACnet MS/TP

Communications (LonWorks)

Connection: 2 way pluggable, screw terminal
Protocols: LonWorks FT-10

Communications (Ethernet)

Connection: RJ45, 10/100Base-T
Protocols: Modbus TCP or BACNet/IP or SNMP or DNP 3.0 over IP

Pulse / Status Outputs (Optional)

Type: Potential Free, N.O. Solid State Relay
Pulse Width: 100 mS default
Min 50 mS, User configurable up to 10 Seconds
Max 10 Pulses per Second
Pulse Rate: 1 pulse / 1 kWh default, User configurable
Max On-Resistance: 30 ohm
Max switching voltage: 50Vdc or 30Vac
Max switching current: 120mA (350mA for 10mS)
Approved for VRF / VRV applications
Connection: Isolated Pin-Pair (Output 3, Outputs 1 and/or 2)

Counter / Status Inputs (Optional)

Type: Dry Contact
Min Pulse Width: 50mS, Max 10 Pulses per Second
Max Current/Voltage: 15mA / 18V
Connection: 2 Pin-Pairs (Inputs 1 and/or 2)

Standards & Safety

Safety: ETL listing: 4001073
UL 61010-1:2012 Ed. 3 +R: 29Apr2016
CSA C22.2#61010-1:2012 Ed. 3 +G1
EMC: IEC 61000-6-3 Emissions, IEC 61000-6-2 Immunity, IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5, IEC 61000-4-6, IEC 61000-4-8, IEC 61000-4-11
FCC: CISPR 22/FCC 15 class A
Category III – 280Vac / 485Vac

Add-On Products