Menu
Cimetrics
0
  • Home
  • Products
    • BACstac BACnet Stacks
    • BACnet MS/TP, B/IP & B/SC Routers
    • High-Density B/SC Diagnostic Hubs & Site CA
    • BBMD in a Box
    • Secured by Cimetrics™
    • BACnet Modules
    • BACnet Metering Gateways
    • BACnet Web Services
    • BACnet Explorer
    • Request Product Information
  • Services
    • For Building Owners
    • For Product Developers
    • For Facility Managers
    • Request Technical Support
  • About
    • About Cimetrics Video
    • Management
    • Vision
    • History
    • Our Technology
    • Our Customers
    • Case Studies
    • Career Opportunities
    • Terms & Conditions
    • Privacy Policy
  • Contact Us
    • Contact Us
    • Request Product Information
    • Request Technical Support
    • Security Center
    • Do not sell my personal information
    • Product Return Policy
    • Limited Hardware Warranty
  • Blog
  • Sign in
  • United States (USD $)
  • Your Cart is Empty
Cimetrics
  • Home
  • Products
    • BACstac BACnet Stacks
    • BACnet MS/TP, B/IP & B/SC Routers
    • High-Density B/SC Diagnostic Hubs & Site CA
    • BBMD in a Box
    • Secured by Cimetrics™
    • BACnet Modules
    • BACnet Metering Gateways
    • BACnet Web Services
    • BACnet Explorer
    • Request Product Information
  • Services
    • For Building Owners
    • For Product Developers
    • For Facility Managers
    • Request Technical Support
  • About
    • About Cimetrics Video
    • Management
    • Vision
    • History
    • Our Technology
    • Our Customers
    • Case Studies
    • Career Opportunities
    • Terms & Conditions
    • Privacy Policy
  • Contact Us
    • Contact Us
    • Request Product Information
    • Request Technical Support
    • Security Center
    • Do not sell my personal information
    • Product Return Policy
    • Limited Hardware Warranty
  • Blog
  • Translation missing: en.general.country.dropdown_label

  • 0 0

Power over Ethernet for HVAC/metering: A Success story

November 12, 2014

We have a large campus customer site where we do metering for electric, steam, chilled water and water (most of WAGES except gas – and that is on the roadmap). 

The meters of interest all have Modbus protocol capability – either as an easy switch in their interface, or as an added inexpensive board from the meter manufacturer, or as a simple add on box from the manufacturer or a third party (a surprise overall for the customer).

But once Modbus enabled, they need to get into some TCP/IP protocol for the enterprise aggregation. Now TCP/IP can be carried over many data-links, but WiFi and Ethernet are certainly the most common and easiest/cheapest with which to connect.

Installation of boxes direct from Modbus to BACnet/IP and Modbus TCP facilitate the connection to TCP/IP… Boxes like Cimetrics B6030 Modbus Device to BACnet/IP edge device and Cimetrics B2000 Modbus MBAP RTU/TCP router. Direct pulse pickup is done by our Cimetrics B6070.

The Cimetrics Eplus devices are Ethernet boxes which need power to run and drive RS485 for Modbus RTU and I/O for pulse. For some commodities, especially water, the installations are hard to bring electrical outlets to, and even with in house labour involve some expense (around a few hundred dollars). They are also costs in bringing Ethernet, but this compares to some locations (like water and sewer vaults) to which WiFi is impractical to bring. The cost of the actual box placement combined with power and Ethernet installation becomes greater than the cost of the box itself.

During the campus install the IT department came to us (they were installing Ethernet drops) and said:

What are you doing? Don’t you realize that we have a global roll out of 802.3af for VOIP and security services and power for your meter device ports is sunk cost in existing infrastructure – there for the asking (and helpful to use as forward going justification of that Power over Ethernet(PoE) infrastructure install) . Even if we did not have it, in locations where you deploy your own switches/hubs – why not use (cheap) 802.3af enabled gear to get your power?

We felt a bit foolish given our IT expertise, but immediately changed tracks and stopped requesting 120VAC power outlets, instead submitting a request for 802.3af along with our request for a drop and IP address. Forward going install costs were halved. We were able to do this in part because our devices are low power and fit well within the 10W 802.3af PoE limit. Ongoing tracking and maintenance were improved because the IT plant was the power provisioner too.

It was such a good arrangement that we instituted a systematic programme to get 802.3af capability for all our small box Eplus products. Sometimes this capability is a simple flexible 802.3af injector. We can provide integrated 802.3af as well, for large installs which have 802.3af as the main method of power.

  • Share:

Leave a comment

Comments will be approved before showing up.


Also in Cimetrics News

April 2025 company news
April 2025 company news

May 01, 2025

BACnet User Group June 12, Energy Optimisation with Analytika, April Cybersecurity news, Cybersecurity course from BACnet international and more...

Read More

Cybersecurity news April 2025
Cybersecurity news April 2025

April 29, 2025

CISOs band together to urge world governments to harmonize cyber rules, What To Know About AI, Cybersecurity And Compliance Framework, New Bill Mandates Cybersecurity Overhaul for Federal Contractors and more...

Read More

March 2025 company news
March 2025 company news

April 01, 2025

Why BACstac/DN is the Best Choice for BACnet Development, AI-Ready Buildings, Analytika became a Qualified Service Provider for the New York area and more...

Read More

Follow

Sign up to get the latest on sales, new releases and more…

© 2025 Cimetrics.
Powered by Shopify

American Express Diners Club Discover Mastercard Shop Pay Visa