I need EIA-RS232C standard

I believe sales of EIA Standards is handled by:

Electronic Industries Association Engineering Department

2001 Eye Street, N.W. Washington D.C., 20006

You need to know that there are at least several revised versions of RS-232. The first one is ANSI/EIA-232-D-1986. I imagine there may be at least three or four later ones.

Don

Two things.

1. It's easy to search for
   formatting link

1. The RS232 standard (in all it's variations) is a hardware and signalling standard and does not specify any particular line protocol (although it's usually used asynchronously).

Cheers

PeteS

sorry,from the google link I can not find orignal EIA-RS232C standard

One wonders just which part of the spec you need.

There's really not that much to it.

Physical (connectors) Definitions (DTE / DCE) Signals, names, active levels, handshakes. Electrical levels

I can't think of anything else

Cheers

PeteS

You could try reading this:

Cheers

PeteS

There is no such thing as a "DB9" connector. Maybe they meant "DE9".

The rest looks pretty good.

Remember the first rule of 232 troubleshooting: if it doesn't work. swap 2 and 3.

I don't know why you would think there's no such thing as a DB9 connector.

I've used the term DB9 (and DB25 and DBx where x = # pins) for well over 20 years, and so, apparently have others.

Go to Molex

and put DB9 in the search box - it brings up the venerable 9 pin D. I'll agree that nowadays it tends to be called a D Subminiature (although it's not very miniature compared to newer connectors).

Cheers

PeteS

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Two wrongs don't make a right.

Strictly speaking the 'B' in DB9 should be the body size of the connector (A - E) the small body used for a 'DB9' is an 'E' size. But for some reason everybody has been using DB9 incorrectly for so long that the 'DB9' term came to be commonly used term.

kevin

But ITT Cannon, who I believe invented the D-subminature connector family, says that the second letter indicates the shell size.

For standard-density connectors, an "A" shell holds 15 pins, "B" holds

25, "C" has 37, and "D" has 50. "E" (apparently an afterthought) has 9 pins.

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You are correct, but.......

When the Standards bodies, EIA in this case, don't step up to providing a definition of the interfaces (DCE - DTE), then predominate terms will prevail. Lacking a Standard, it is unlikely that all manufacturers will use the same name for the same connector. Who "owns" the scheme discussed in the link?

In ANSI/EIA-232-D-1986 the DCE -DTE connectors are called simply a 25-pin connector and dimensions are provided. We all call it a DB25, but the Standard doesn't.

Many connectors are "incorrectly" named, but who wants to fight it? The Ethernet connector is called a RJ45, but those who know better know it really should not be called that. EIA could have fixed the problem, but I don't believe they have. So RJ45 works, it dominates, so it must be right.

FWIW my irritation with the troll was the lack of a quote directing attention to the object of his post.

Don

Don

what ?

please look there. or have all of our manf sales ref gone wacky!

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It is a bit like 'Hoover', for 'vacuum cleaner'. From the original sizing standards, 'DB9', would actually imply a plug the size/shape of the DB25, with only 9 of the pin places populated. However the designation has become so widely used now, that in a sense events have formed a 'new' standard....

Best Wishes

So what would you call a DE15? - that is the connector that is used for computer video output. 15 pins in three rows in the same size shell that a 9 pin standard D connector uses.

Perhaps we should call it a DB15 -- whoops we already have one of them!

Alan

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