Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Notifications
Login / Register
Community
Community
Notifications
close
  • Forums
  • Knowledge Center
  • Events & Webinars
  • Ideas
  • Blogs
Help
Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Login / Register
Sustainability
Sustainability

We Value Your Feedback!
Could you please spare a few minutes to share your thoughts on Cloud Connected vs On-Premise Services. Your feedback can help us shape the future of services.
Learn more about the survey or Click here to Launch the survey
Schneider Electric Services Innovation Team!

What is the difference between the two types of Floating point functions in the Modbus RTU X Driver?

Building Automation Knowledge Base

Schneider Electric Building Automation Knowledge Base is a self-service resource to answer all your questions about EcoStruxure Building suite, Andover Continuum, Satchwell, TAC…

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 
  • Home
  • Schneider Electric Community
  • Knowledge Center
  • Building Automation Knowledge Base
  • What is the difference between the two types of Floating point functions in the Modbus RTU X Driver?
Options
  • Bookmark
  • Subscribe
  • Email to a Friend
  • Printer Friendly Page
  • Report Inappropriate Content
Invite a Co-worker
Send a co-worker an invite to the portal.Just enter their email address and we'll connect them to register. After joining, they will belong to the same company.
You have entered an invalid email address. Please re-enter the email address.
This co-worker has already been invited to the Exchange portal. Please invite another co-worker.
Please enter email address
Send Invite Cancel
Invitation Sent
Your invitation was sent.Thanks for sharing Exchange with your co-worker.
Send New Invite Close

Related Forums

  • Intelligent Devices Forum

Previous Next
Contributors
  • GavinHe
    GavinHe
  • Product_Support
    Product_Support
  • Chris_Asbury
    Chris_Asbury
  • PaulFr
    PaulFr
  • Dave_Shore
    Dave_Shore

Invite a Colleague

Found this content useful? Share it with a Colleague!

Invite a Colleague Invite
Back to Building Automation Knowledge Base
Options
  • Bookmark
  • Subscribe
  • Email to a Friend
  • Printer Friendly Page
  • Report Inappropriate Content
0 Likes
3070 Views

Link copied. Please paste this link to share this article on your social media post.

Trying to translate this page to your language?
Select your language from the translate dropdown in the upper right. arrow
Translate to: English
  • (Français) French
  • (Deutsche) German
  • (Italiano) Italian
  • (Português) Portuguese
  • (Русский) Russian
  • (Español) Spanish

What is the difference between the two types of Floating point functions in the Modbus RTU X Driver?

Picard Product_Support
‎2018-09-11 03:24 PM

Last Updated: Admiral GavinHe Admiral ‎2022-09-20 04:06 AM

Issue

What is the Intel Floating point number as used in the Modbus X Driver?

Product Line

Andover Continuum

Environment

Modbus RTU X Driver

Cause

It is not clear how the two special floating point function codes vary.

Resolution

There are two different floating point data formats (248 & 245) these are both standard 32 bit floating point numbers but the data bits stored in memory (or read over the protocol) differently.

 

The 32 bits of Function 248 are stored as one string of bits, bit 0 through to bit 31.

 

For the 245 format the upper and lower words are swapped around, so it stores the data as bits 15 to 0, then bits 31 to bit 16. This format is called Intel format as it is the way Intel microprocessors handle floating point data.

 

Here is a link to information on floating point numbers FYI: https://en.wikipedia.org/wiki/Floating-point_arithmetic

 

These two formats can also be called Big Endian (Function 248), or Little Endian (Function 245). Little Endian is also known as the Intel format.


Information on Endianness can be found at: https://en.wikipedia.org/wiki/Endianness

Labels (1)
Labels:
  • Andover Continuum
Tags (4)
  • Find more articles tagged with:
  • 15115
  • big-endian
  • GavinHeward22
  • little-endian
Was this article helpful? Yes No
No ratings

Link copied. Please paste this link to share this article on your social media post.

To The Top!

Forums

  • APC UPS Data Center Backup Solutions
  • EcoStruxure IT
  • EcoStruxure Geo SCADA Expert
  • Metering & Power Quality
  • Schneider Electric Wiser

Knowledge Center

Events & webinars

Ideas

Blogs

Get Started

  • Ask the Community
  • Community Guidelines
  • Community User Guide
  • How-To & Best Practice
  • Experts Leaderboard
  • Contact Support
Brand-Logo
Subscribing is a smart move!
You can subscribe to this board after you log in or create your free account.
Forum-Icon

Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.

Register today for FREE

Register Now

Already have an account? Login

Terms & Conditions Privacy Notice Change your Cookie Settings © 2025 Schneider Electric

This is a heading

With achievable small steps, users progress and continually feel satisfaction in task accomplishment.

Usetiful Onboarding Checklist remembers the progress of every user, allowing them to take bite-sized journeys and continue where they left.

of