Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

rs232 through slip rings?

rs232 through slip rings?

rs232 through slip rings?

I have a Micrologix 1000 on the moving end of a crane.  Power and discrete i/o are transmitted to/from the Micrologix through slip rings.  Can I run 232 communication to the Micrologix through the slip rings?

RE: rs232 through slip rings?

     Yes you probably could. However it might be more cost effective to use an unlicensed band data communications radio. These can be purchased for about $900 each or less. High quality slip rings could cost you more.

RE: rs232 through slip rings?

I would only use slip rings, In an application that did not require data to be transfereed while the machine was moving.
If the machine is moving during data transmission, I woul opt for a frequency hopping spread spectrum radio transmitter and receiver. This type of data transmission transmits data over multiple carriers on different frequencies. The first packet of data is transmitted over carrier one for example, the second data packet is transmitted over carrier 2 and so on. Best regards, PLCSAVVY

RE: rs232 through slip rings?

Thanks for the fast reply.  The part of the crane that I am trying to communicate to is a small retrieval unit that "tunnels" into a rack storage system and picks up pallets of product(food).  Could anyone recommend a radio that is smaller than 3"x4"x6".  One that is very durable, has a 200' range through product, can coexist in a small control box with 480V motor starters, and isn't 2.4GHz.

RE: rs232 through slip rings?

Just a short note about slip rings.
I have been working with some machines that are using slip rings to transmit data Whilst I have not investigated exactly what protocol it is I do know that it is very reliable & a critical part ot the process.  The rotational speed is approx 20 rpm.  The main plc siemens s700 communicates to a s400 on the wheel via these slip rings I suspect that the protocol is similar to AB DH+  on the rare ocation that comms is lost the machine intiates a shutdown process coasts to a halt where it waits for the operator to restart it.  works a charm.

RE: rs232 through slip rings?


Try looking at the MDS Transnet radio, www.mdsroc.com.
This radio is small, power efficient, 900Mhz spread spectrum, and built for harsh environments.

RE: rs232 through slip rings?

Thanks to all for the help.  The MDS radio looks great.  I am also looking at the OS2400 radios from locusinc.com

RE: rs232 through slip rings?

If you can convert your data to fiber, there are several styles of fiber optic rotary joints available that may meet your needs.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close