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Question

DE-9 connector

by o00pcsm / November 14, 2014 9:32 AM PST

what is this connector used for?

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All Answers

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Answer
Re: connector
by Kees_B Forum moderator / November 14, 2014 4:43 PM PST
In reply to: DE-9 connector

My 300 baud modem had that in 1990. A current laptop or PC doesn't have the port to connect it, so it's a question nobody asks anymore today.

http://en.wikipedia.org/wiki/D-subminiature tells more in the chapter "Typical applications".

Kees

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Answer
Depends...as best I can remember
by Steven Haninger / November 14, 2014 10:31 PM PST
In reply to: DE-9 connector

I believe the "D" refers to it's shape. The "9" is the number of possible pin positions. There were several variations of this but I believe all configurations had an odd number of pins. I recall a transmission protocol named 20 mill current loop and later there was RS-232 (serial) that used the same plugs and jacks but devices not matching in protocol were not compatible with one another. The first serial mice were RS-232. That later gave way to PS-2 use for mice and keyboards. Serial outputs on older PCs were usually "D" connectors in 9, 15, 21, and 25 pin configurations. (someone will correct me if I'm wrong but the 9 and 21 pin connectors were for serial ports 1 and 2 and the 25 pin port was for printers using the Centronics parallel standards. The 15 pin port was for VGA. That one is still around but fading.

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Answer
Yeah...RS-232 port,
by Oldartq / November 15, 2014 1:34 AM PST
In reply to: DE-9 connector

external modem and game comes to mind...vaguely.

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(NT) I think also midi as well.
by Oldartq / November 15, 2014 1:39 AM PST
In reply to: Yeah...RS-232 port,
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Dedicated game ports
by Steven Haninger / November 15, 2014 4:45 AM PST
In reply to: Yeah...RS-232 port,

I remember these as being on the first Soundblaster cards. Their shape and pin configuration wasn't the same as serial ports.

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