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DLM Dual Tech Ceiling Mount Sensor

LMDC-100 Wattstopper
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The LMDC-100 low profile Dual Technology Ceiling Mount Occupancy Sensor uses both passive infrared (PIR) and ultrasonic technologies to achieve precise occupancy sensing for energy-efficient control of lighting and plug loads. It is a digital sensor, and is part of a Wattstopper Digital Lighting Management (DLM) system.

Color White


  • Plug n’ Go™ automatic configuration for quick installation and maximum energy savings
  • Push n’ Learn™ functionality for customization without the need for tools or a PC
  • Digital Lighting Management components plug together on a free-topology Category 5e DLM local network
  • Infrared (IR) transceiver for wireless configuration and control
  • Ultrasonic diffusion technology spreads coverage to a wider area (patented); 40KHz signal
  • 360 degree PIR coverage
  • Detection Signature Processing eliminates false triggers and provides immunity to RFI and EMI


General Info
Product Line Wattstopper
UPC Number 754182926329
Country Of Origin China
Additional Information
DesignLights Consortium Qualified System Yes
Product Environmental Profile Yes


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Questions & Answers

Is the LMDC-100 designed to function in low-movement settings such as conference or meeting rooms where people are always seated? Does that affect the installation height? We want to avoid lights shutting off during meetings where there isn't movement.

Asked by: JB
The LMDC-100 is an occupancy sensor. It's main function is to trigger on the load when it detects motion and keep the load on as long as it detects motion. It also will to turn off the load when it doesn't detect a motion after the time delay expires. If someone feels that it may turn off the load because people are not moving it's recommend to set the time delay to 30 minutes which is the maximum. Outside of maximizing the time delay you can put the sensor into override mode which will not allow it to use the time delay, plus the two technologies like the PIR and Ultrasonic within the sensor will no longer function and the sensor will not respond to movement or lack of movement but you will have to use a switch to turn on and off the lights because the sensor is dormant.
Answered by: Tier 1 Tech Support
Date published: 2022-02-17

What is max mounting height above finish floor for the sensor LMDC-100 – U ? We intend to install LMDC-100 – U sensor to a pendant. The bottom of the mounting box is 12'-4" AFF. Is this mounting height acceptable?

Asked by: B254
The maximum mounting height for an LMDC-100 is 10 feet. It is recommended that you use an LMPC-100-5 sensor for ceiling heights from 10-40ft. https://www.legrand.us/lighting-controls-and-systems/occupancy-and-vacancy-sensors/ceiling-wall-mount-occupancy-sensors/dlm-pir-ceiling-mount-sensor-with-extended-height-lens/p/lmpc-100-5
Answered by: Tier 1 Tech Support
Date published: 2022-02-01

Lights won’t turn on or off automatically using this sensor . I am using compatible switch . 

Asked by: Sparky
There may be an issue with the programming. Please contact Wattstopper Technical Support @ 800-879-8585 for troubleshooting assistance.
Answered by: Tier 1 Tech Support
Date published: 2022-02-01

What is the pin out for the RJ45 connections? Does this use the same pinout as Cat5E network cables?

Asked by: JRPJR
568B is the recommended pin out for Cat5 cables being used with the DLM system.
Answered by: Tier 1 Tech Support
Date published: 2021-08-10

We have 3 LMDC-100s daisy chained together and only the first one is operational. I don't see any documentation on this type of setup. Is this a valid configuration?

Asked by: Brian
Yes, the DLM system is an open topography system and it is perfectly fine to wire in that configuration. Please call Technical Support @ 800-879-8585 if you require troubleshooting assistance.
Answered by: Tier 1 Tech Support
Date published: 2021-08-03
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