On 2014-05-17, Larry Jaques wrote:
On Fri, 16 May 2014 12:30:55 -0400, "Michael A. Terrell"
wrote:


Tom Gardner wrote:

I had a huge struggle with soldering a couple of DB-9 connectors, my

[ ... ]

BTW, it isn't a DB-9, it is a DE-9. The second letter is the shell
size. The common 25 pin shell is a 'B'. The SVGA monitor plug is a
HDE-15.

http://en.wikipedia.org/wiki/D-subminiature

Interesting! Even when I was buying them for computers/cables I
built, they were always listed as DB-9s.

The people who know what they are doing will recognize them
anyway, knowing that there is no such thing as a DB-9, and the use of
the common wrong name makes those who don't know satisfied that they got
what they asked for.

The letter sequence is weird, BTW. Assuming the two rows of
individual pins, they are "DA-15", "DB-25", "DC-37" "DD-50" (really three
rows) and finally "DE-9".

The 9-pin size was an afterthought, and you can't back up to a
letter before 'A' unlike being able to back up '1' to '0' (or even minus
numbers at need). :-)

I don't know for sure who originated the series, but the first
ones I remember were made by Canon, and had white Nylon insulators,
which happily melted as you were soldering, so if you weren't quick
enough at it, you wind up with the pin at an angle as the Nylon hardens
again. :-)

Enjoy,
DoN.

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