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Old March 12th, 2015, 03:28 PM   #1
Scott Hill
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8 Pin Mini Din connector on Allen Bradley-RS-485 comms

Hello all,

I joined this forum because I saw there was discussion about the 8 Pin Mini DIN connector on Allen Bradley. I am trying to connect RS-485 comms to other devices. We wish to use the existing port rather than add another Isolator module. We are implementing Modbus using the Micro 830 processor

Standard 8 pin mini dins seem to have different keyways then the connector on the AB PLC. I have a sample of a CUI connector coming to check fit. I noticed that folks here seemed to indicate a standard 8 pin conn will fit... just not as well as the "special" AB connector.

Does anyone know if a standard 8 pin connector will fit the port??

Also, AB sells several cables. The 1763-NC01 is nice but the connector block is huge. The rest seemed to be wired for RS-232 and do not have conductors on pins 1 and 8... the two needed for RS-485 comms.

Optimally, I would like to find a prebuilt 8 pin cable with leads on one end that we can terminate with our own connector

Any help or hints would be appreciated. I have a strong desire to learn as much as possible about automation. I am grateful to have found this site.

Thanks so much!
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Old March 12th, 2015, 04:05 PM   #2
Bering C Sparky
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Drop Mark at Industrial Concepts an email and he should be able to hook you up with any cable you need or at least be able to answer any questions you have about cable types.

Here is a link for I.C.

http://www.plccable.com/

BCS
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Old March 12th, 2015, 04:09 PM   #3
Geospark
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Hi and welcome to the forum!

Were you reading here: http://www.plctalk.net/qanda/showthread.php?p=627422 ???

Actually, after that discussion I took some pictures of the inside of a MicroLogix 1000 and 1400 while looking at the 8-pin ports. I had meant to post the pics up in the other discussion, but have been too busy and forgotten.

I was plugging the cables that I have from RS in and out at the time. The ports appear to be identical, but for some reason the ML1000 is a tighter fit?

Once plugged in it does work.

As Genius mentioned in that other thread, the standard dimpled plugs tend to be tight.

Dropbox Photos

Regards,
George
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Old March 12th, 2015, 04:09 PM   #4
Scott Hill
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Quote:
Originally Posted by Bering C Sparky View Post
Drop Mark at Industrial Concepts an email and he should be able to hook you up with any cable you need or at least be able to answer any questions you have about cable types.

Here is a link for I.C.

http://www.plccable.com/

BCS

Thanks Sparky, I have been in touch with Mark.. his is an option

He has the 1761-CBL-HM02 Cable. I have to make sure all 8 pins are terminated and both ends are male.
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Old March 12th, 2015, 04:12 PM   #5
Scott Hill
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Quote:
Originally Posted by Geospark View Post
Hi and welcome to the forum!

Were you reading here: http://www.plctalk.net/qanda/showthread.php?p=627422 ???

Actually, after that discussion I took some pictures of the inside of a MicroLogix 1000 and 1400 while looking at the 8-pin ports. I had meant to post the pics up in the other discussion, but have been too busy and forgotten.

I was plugging the cables that I have from RS in and out at the time. The ports appear to be identical, but for some reason the ML1000 is a tighter fit?

Once plugged in it does work.

As Genius mentioned in that other thread, the standard dimpled plugs tend to be tight.

Dropbox Photos

Regards,
George

Thanks George... I will review the referenced thread

I can't believe how hard AB has made this
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Old March 12th, 2015, 10:05 PM   #6
DwSoFt
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http://www.theautomationstore.com/al...1761-cbl-pm02/

Used these guys a couple times now and I am Happy. I actually just ordered this exact cable last week.
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Old March 13th, 2015, 07:37 AM   #7
Scott Hill
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Quote:
Originally Posted by DwSoFt View Post
http://www.theautomationstore.com/al...1761-cbl-pm02/

Used these guys a couple times now and I am Happy. I actually just ordered this exact cable last week.

We have one of those cables here.. Pins 1 and 8 have no conductors and it won't carry the RS-485 Modbus

Thanks for sharing though
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Old March 13th, 2015, 08:12 AM   #8
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even the copycat ones not made by Allen bradley don't have those pins?
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Old March 13th, 2015, 08:17 AM   #9
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Originally Posted by DwSoFt View Post
even the copycat ones not made by Allen bradley don't have those pins?
Not sure yet... there are some knockoffs that at least say they are for RS-232 or RS-485
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Old March 13th, 2015, 08:32 AM   #10
Bering C Sparky
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Just a thought if you dont find anything else, I know they make a round 8 pin to 9 pin sub D adapter. I have one but not in front of me, I can get it and see if there is a part number on it if you want.

I have been meaning to order a spare one of these myself.

You could plug this into your 8 pin socket and make what ever you want to come from the 9 pin sub D easy enough.

BCS
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Last edited by Bering C Sparky; March 13th, 2015 at 08:43 AM.
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Old March 13th, 2015, 09:56 AM   #11
Bering C Sparky
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WELL....Scratch that Idea also.
Just went and grabbed my adapter and not all pins are connected on it either.

BUT... I did stumble accross something that might be worth you taking a look at to see if it will work for you.

Google "pin out for apple / mac printer cable 8 pin mini din"
If you use internet explorer hit the images tab and look at this cable, sure looks like the exact same as my AB mini din 8 connector.

Looks like you can get this cable in all kind of configurations but seems like most do have all 8 pins connected end to end.

Hack off one side and put on a Phoenix Contact Subcon 9 Sub D connector and away you go. (subcon 9/f-sh or subcon 9/m-sh)

Found a lot of these Mac cables on Ebay also.

Just a thought if you dont come up with anything else.

BCS
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Old March 13th, 2015, 10:06 AM   #12
Bering C Sparky
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Apple Mac 10 ft Printer Cable Imagewriter Image II mini din 8 pin
Attached Images
File Type: jpg Mac cable pic.jpg (7.7 KB, 23 views)
File Type: jpg Mac cable pin out.jpg (63.2 KB, 21 views)
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Old March 13th, 2015, 12:16 PM   #13
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Quote:
Originally Posted by Scott Hill
...Pins 1 and 8 have no conductors and it won't carry the RS-485 Modbus
The cable I've demonstrated does work for Modbus between a ML1400 and a PowerFlex 4. All pins are populated, including the screen. So there are 9 wires available for you to terminate to your device. I've added a close up photo to the same collection I linked earlier. You can see the troublesome dimples on the plug, but it does plug in. There is nothing special about this cable. I'm sure there are many like it on the market. I just found this one from Radionics, whom we deal with a fair bit, and it worked.

The Radionics stock number is 463-518

Dropbox Photos

Regards,
George
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Old March 13th, 2015, 12:38 PM   #14
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Quote:
Originally Posted by Geospark View Post
As stated we did some looking and the 1761-CBL-AM00 or HM02 they both have all pins and will work

Quote:
Originally Posted by Scott Hill
Thanks Sparky, I have been in touch with Mark.. his is an option

He has the 1761-CBL-HM02 Cable. I have to make sure all 8 pins are terminated and both ends are male.
Scott are you the person looking for cable size? but anyway yes this should work

Quote:
Originally Posted by DwSoFt
http://www.theautomationstore.com/al...1761-cbl-pm02/

Used these guys a couple times now and I am Happy. I actually just ordered this exact cable last week.
Quote:
Originally Posted by DwSoFt
even the copycat ones not made by Allen bradley don't have those pins?
They are a re-seller of our products and their PM02 does not have all pins landed, we make them the same way that AB makes theirs

Quote:
Originally Posted by Bering C Sparky
Drop Mark at Industrial Concepts an email and he should be able to hook you up with any cable you need or at least be able to answer any questions you have about cable types.

Here is a link for I.C.

http://www.plccable.com/

BCS
Thanks for the plug
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Old March 13th, 2015, 12:41 PM   #15
Geospark
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Quote:
Thanks for the plug
No pun intended I'm sure!

G.
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