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#1443574 - 01/21/16 05:27 PM Making an RBUS cable adapter
bear Offline
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I had mentioned it was very easy to make an adapter that would take a normal DB25 to DB25 cable and turn it into a RBUS cable - in the process of testing my new RBUS interface I actually had to make one - here is what it looks like.

I had a Male to female DB25 cable in a junk box (that carried all 25 conductors straight through). I just took 2 DB25 crimp connectors and crimped them onto a short piece of ribbon. All you have to make sure of is that you reverse one connector... so PIN1 on one connects to PIN13 on the other. Plug this onto your normal cable, and viola it becomes an RBUS cable...




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#1443599 - 01/21/16 06:15 PM Re: Making an RBUS cable adapter [Re: bear]
Frank Griffith Offline
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#1443627 - 01/21/16 07:39 PM Re: Making an RBUS cable adapter [Re: Frank Griffith]
C Jo Go Offline
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BEAR -- its only one that you have to reverse one wire of the 25 ?? I heard back awhile ago -- it wasn't that easy ?? This is great news ~!
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#1443632 - 01/21/16 08:58 PM Re: Making an RBUS cable adapter [Re: C Jo Go]
bear Offline
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No, you are misunderstanding - when you crimp a connector on a ribbon such that pin1 goes to pin13, it reverses ALL the other pin also

Pin12 goes to 2, 11 to 3 etc etc all they way down

The point is all you need to do is crimp each connector and it makes all the connections at once. Super fast and easy (compared with soldering 25 wires and crossing them). I just use a little vise or a pair of channel locks to crimp them. Takes about 10 seconds to make one.

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#1443643 - 01/21/16 10:22 PM Re: Making an RBUS cable adapter [Re: bear]
uptildawn Offline
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Do you recommend a particular pin count size cable, bear?... 40-pin, 80-pin, floppy drive cable, whatever?
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#1443649 - 01/22/16 12:04 AM Re: Making an RBUS cable adapter [Re: uptildawn]
bear Offline
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To crimp a 25 pin connector on a ribbon it has to be 25 conductor ribbon of course
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#1443656 - 01/22/16 04:28 AM Re: Making an RBUS cable adapter [Re: bear]
Winerz Offline
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Amazing thanks for posting - beats paying 70!
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#1443669 - 01/22/16 08:04 AM Re: Making an RBUS cable adapter [Re: bear]
uptildawn Offline
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 Originally Posted By: bear
To crimp a 25 pin connector on a ribbon it has to be 25 conductor ribbon of course

I suppose I could have figured that, but I sure don't have 25-pin ribbon cable lying around, like I do old PC cables... Your instructions made it sound like you just used any spare ribbon cable in an old junk box.... at least that's how I read it. I was just curious, not criticizing. I don't have anything to rbus to.
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#1443680 - 01/22/16 10:19 AM Re: Making an RBUS cable adapter [Re: uptildawn]
bear Offline
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SOME old PC cables may work... more modern IDE drive cables have double density spacing on the wires though, and will not.

Yeah I have tons of stuff like this hanging out in junk boxes, and have been making cables like this for years. I forget that to others it may seem arcane...

However this stuff is dirt cheap and easy to buy online from a electronics hobby supply or ebay


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#1443681 - 01/22/16 10:27 AM Re: Making an RBUS cable adapter [Re: bear]
bear Offline
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Here, buy one of these and cut the ends off, and peel out 25 conductors from the 40. 18 inch will make 9 or 10 adapters for $2 worth of ribbon cable

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_32686_-1

Or - I really like the rainbow cable

http://www.ebay.com/itm/1M-3-3ft-40-Way-...HEAAOSwjVVVtIZ8

or similar - this is one of the older type of IDE cables that would work - you need .050 inch pitch spacing on the wires

It is super easy to peel back just the number of conductors you want -I ususally make a small cut with a xacto knife, then just peel it off.


And then connectors like these - An RBUS cable needs to end up being MALE on both ends, so if you are trying to adapt a male to female straight through cable use 2 male connectors, if you are trying to adapt a male to male straight through cable use a female and a male connector.

http://www.ebay.com/sch/i.html?_odkw=rib...nector&_sacat=0

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#1443687 - 01/22/16 10:46 AM Re: Making an RBUS cable adapter [Re: bear]
bear Offline
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The only caveat to all this - rbus signals are pretty fast digital signals - it may not work with some really cheap db25 to db25 cables, or ones that are too long...

And you have to make sure the cable you are trying does indeed carry all 25 pins across. Some older RS232 cables did not. Old printer and SCSI cables generally work fine.

I have tried this with several cables from my junk drawer and never had a problem.

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#1443695 - 01/22/16 11:28 AM Re: Making an RBUS cable adapter [Re: bear]
uptildawn Offline
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Great advice and links, bear!
I've got a load of the 40-pin IDE ribbon laying about.
Printer cables are plentiful around the house as well. I've used them for SCSI connectors on the 1680 for years...... work great!
All I need, I think is the connector ends now.
I saw some of that rainbow ribbon the other day...... I like that, too.
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#1443699 - 01/22/16 11:52 AM Re: Making an RBUS cable adapter [Re: uptildawn]
Starliner Offline
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There was a post about making R-Bus cables from Cat5 cables, which I have on my hard drive. That is likely what C Jo is referring to.

I still have it if anyone needs it. It shows the pinouts and twisted pairs connections. Bear's unit is much simpler.

I also downloaded a pdf with similar info, showing two DB-25 connectors and straight wiring between them. Easier to read.

Starliner
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#1443700 - 01/22/16 12:00 PM Re: Making an RBUS cable adapter [Re: uptildawn]
bear Offline
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Hints for crimping if you have not done it -

it is easy to damage the metal housing as you grab it with a vise or pliers (if you look close at my picture above you can see I was not careful enough and did bend the metal a little...)

You can prevent this by taking a connector of the opposite sex and plug them into each other - then crimp on both.

And if you look carefully MOST connector have the pin numbers molded into them next to the pins on a male or the holes on a female - so make sure you get the 1 to 13 swap correct...

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#1444000 - 01/23/16 06:34 PM Re: Making an RBUS cable adapter [Re: bear]
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#1444594 - 01/26/16 09:27 PM Re: Making an RBUS cable adapter [Re: JazAddict]
Starliner Offline
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Two R-Bus Cables / Adapters





Starliner


Edited by Starliner (01/26/16 09:32 PM)
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#1444595 - 01/26/16 09:29 PM Re: Making an RBUS cable adapter [Re: Starliner]
bear Offline
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Well that is doing it the hard way...
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#1444596 - 01/26/16 09:35 PM Re: Making an RBUS cable adapter [Re: bear]
Starliner Offline
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Yes, it is.

Same result, just different method.


Starliner
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#1503602 - 11/16/16 02:11 PM Re: Making an RBUS cable adapter [Re: Starliner]
HARDDRlVER Offline
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I know this is a very old thread but I'm wondering if anyone remembers doing this with any success...and other issues involved in creating an rbus cable from ribbon cable.
My question is, can the pins be moved on a 25 pin cable to fake the same results.
Why did Bear go with a ribbon cable and not just rep in a scsi cable

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#1552059 - 11/22/17 10:03 PM Re: Making an RBUS cable adapter [Re: HARDDRlVER]
Bran Offline
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Registered: 07/15/14
Posts: 58
Just made a couple of these with pin 7 pulled out. Rather simple and they hold in place real tight. I merely widen the distance between two rows of pin for one DB25 connector and narrowed the other two rows on another connector and they fit well together for soldering. I use a male to female DB25 cable for extending the length.



Edited by Bran (11/22/17 10:08 PM)

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