GPIB: 24-pin Centronix connectors?

It's hard to shield that. Also, I want to use up some of the remnants from the LAN installation ;-)

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So that is totally different. I have two precison current sources, voltsage sources, 2 precision multimeter and apower supply on GPIB.

So a lot of work to program this. In NI, as I made softwareobjects for the devices, it is easy.

P.

Digging out my copy of IEEE Std 488-1978, the answer appears to be yes. As a footnote, it calls out Amphenol (or Cinch) "Series 57 Microribbon" or AMP "CHAMP". (An Allied or Newark catalog would give a good overview of that old stuff).

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I have a 1991 AMP catalog 2ft from my eyes. Hardcover no less. But it functions as a stand for a really heavy CAD monitor because its color blends in nicely ;-)

So I'll just get a few of those 24-pin Centronix connectors. But solder cup, I do not like ribbon cables, they spew out too much EMI.

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Joerg,

Remind me again why you're looking to build your own GPIB cable rather than just use one of the big "hoses?" No 3-4 foot GPIB hoses in your junk drawers?

---Joel

The hoses are so unwieldy. After one of them recoiled and flung a coffee mug off the bench I just had it. The guy who spec'd in those monster cables should .... nah, I won't say it, it's Christmas.

Theroretically, if you make sure the GPIB is quiet during measurements it should be possible to even string 10ft-20ft of ribbon and push on a connector everywhere you need one. And at the very end the Prologix. I'll probably go CAT-5 though.

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I've found that making every other conductor ground helps a lot with noise immunity, crosstalk, etc.

Thinking back, the HPIB cables I've seen had piggy-back connectors - i.e., a male on the front, with a female piggy-backed on it, to make daisy chains.

Do you plan on making them as well? Or just one custom cable for the lot?

Thanks, Rich

Good Luck! Rich

No, just one long daisy chain. With enough slack or extra connectors that minor reshuffling in the equipment rack doesn't cause some gear to become orphaned.

I just don't want a maze of garden hoses back there.

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Well, heck; if you can do GPIB/HPIB in four pairs, then go for it! I'd kind of have a tendendency to look around for shielded cat5, just 'cuz ( ^^^^^^^^^^^ - oopps! Looks like the Xmas eggnog is kicking in!) I'm superstitious that way. ;-)

Have Fun! Rich

That's my straw man for any connector layout. Unfortunately, that's not what GPIB used.

The best example of alternate signal/ground that I know of is the IDE connector. They have a version that uses 80 wires rather than the normal 40. It's necessary for the high speed modes.

I haven't looked at the details. Does anybody know how they get

80 wires connected to 40 pins? I assume there is some magic in the connector that knows where the grounds are and connects them and the 40 extra wires together.

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There are extra rows of IDC pins for the extra wires. All 40 of the additional conductors are tied together and connected to other, existing ground pins.

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there's only 39 pins for a start (one is a key).

yeah there's magic in the connector (I expect blue black and grey connectors are each different too)

I'll see if I can find a cable to experiment destructively on.

That is correct, they are slightly different inside.

Best regards, Spehro Pefhany

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It is a 40 pin connector and all pins are used at the connector, even if they are not all used in the male header.

No. They are all the same. The master/slave differentiation has to do with the connector location on the cable. Color is simply color, and nothing else is different.

Try simply using a bit of common sense. Oh... that's right... nevermind. This post proves that you do not have any.

Absolutely not.

Absolutely so.

See info on pin 28 & 34.

Best regards, Spehro Pefhany

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I have a certain reckecklessness in that respepect. Whoops ...

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UDMI cables are not using cable select features, idiot.

Remember how the selection is made AT the drive? Learn to read ALL of the article you reference, or it will bite you in the ass.

some cables and most connectors have pin 20 missing.

why would all manufacturers of 80-conductor ATAPI cables stock and use connectors in three different colours when doing so it only costing them money? (over using the same colour in each place)