×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-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!

*Tek-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

Industrial Tech question - Cable to pass DC voltage and serial comm

Industrial Tech question - Cable to pass DC voltage and serial comm

Industrial Tech question - Cable to pass DC voltage and serial comm

(OP)
Hello all,
Not sure if we have anyone who is well versed in the Industrial Tech side of things. I have a fairly basic question that could be answered.

We have a 6P6C connector, likely a RJ12, that connects to a 6 wire cable that comes from a serial to RJ12 comm box. That box is powered with 24VDC, I think but will double check. That cable is passing the DC voltage and the serial information. Curious if there is a specific gauge wire or type needed for passing voltage and data. I cant seem to find it and the cable we have has zero markings on it. It is flat and black and looks to be just a slightly bigger gauge than a normal phone wire. I know you cannot use normal phone cable but that is about my extent.

Any help?

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.

RE: Industrial Tech question - Cable to pass DC voltage and serial comm

There were a few automation devises that I've seen over the years that use the flat "telephone" wire for comms and power connectivity. Often the serial data speed would be 9600 baud or lower, and the power consumption rather low. A typical flat wire would have 28 AWG stranded wire. As such, you will get about 250mA at 24 VDC. You can get a higher gauge flat wire, maybe 26 AWG, but it wont increase power availability much. A standard Ethernet cable would be 24 AWG.

If you are looking to make a new cable, I would use an Ethernet cable and an appropriate 6p connector for the gauge.

RE: Industrial Tech question - Cable to pass DC voltage and serial comm

(OP)
Thank you for your insight. After doing some testing it is a 10V DC passed on the cable as well as the data. Knowing that 28-24 AWG should be fine does line up with what I was thinking. We purchased 100' of 24 AWG 6 pair flat for repair and retermination purposes so I think we are good. I didn't even think to use Ethernet cable as I know PoE is able to be handled with 24 AWG so worst case we can fall back on that cable.

Thanks for helping clarification on all this.

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.

RE: Industrial Tech question - Cable to pass DC voltage and serial comm

(OP)
Thank you IRstuff for the additional info.

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.

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 Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

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

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

Close Box

Join Tek-Tips® Today!

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

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close