Interesting use for a DE9 connector

[jhd]

I recent underwent some medical tests. This included being attached to a pulse oximeter.

 

I noticed that the device connected to the data logger with a standard DE9 connector (though not all of the pins were used).

 

This is the first time that I have seen this connector used outside of video game consoles and PC serial ports.

[Shawn]

DB9 not DE9 right?

[BigO]

I believe it's technically DE9. I'm guessing the DB may have been improperly carried over from DB25 when 9 and 25 were options on modems and such.. But, DB9 managed to stick. Or something like that.

 

EDIT:

https://en.wikipedia.org/wiki/D-subminiature#/media/File:DSubminiatures.svg

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

Edited May 1, 2017 by BigO

[mr_me]

A DB9 is actually the same size (B) and shape (D) as a DB25 but only has 9 pins rather than 25. So DE9 is correct but everyone knows what is meant when the term DB9 is incorrectly used.

[7800fan]

It should be DE9 but too many use it as DB9 (and all other D-shell connectors as DB instead. DA-15, DB-25, DC-37, DD-50, and DE-9. VGA port is technically DE-15 and not something like HD-15 or HDB-15

[Osgeld]

yes dsub connectors are used all over the place, especially in industrial applications, makes me cringe when people plug random crap into them

[carlsson]

@jhd: Quite possibly this is the pinout, if you need to fix it on your next doctor's appointment:

http://pinouts.ru/PortableDevices/nellcore_pulse_pinout.shtml

 

The Pinouts.ru site has a whole bunch of pinouts for the 9-pin Dsub:

http://connector.pinouts.ru/9_pin_D-SUB_male/

 

As for interesting uses of the 9-pin Dsub, I remember some 68K development board using one for power. I don't know if the connector has been specified for that use, but it appeared to work.

[Osgeld]

I just grabbed a random datasheet

 

Current Rating 3amp

Voltage Rating 250VAC

 

There is no rule saying a 9 pin dsub has to be xyz, its not attached to a standard like USB orADB, its just a connector, and it could be connected to anything in any way

[tschak909]

The correct terminology is DE-9, because the E represents the outer shell size. the B size supports connectors of 16 to 37 pins nominally. There is no progression difference between A, B, C, D, or E shell sizes, they are all arbitrary, and specify a rough lateral size.

 

-Thom

[jhd]

@jhd: Quite possibly this is the pinout, if you need to fix it on your next doctor's appointment:

http://pinouts.ru/PortableDevices/nellcore_pulse_pinout.shtml

 

 

Thank-you. It looked like some of the pins were not connected, but I did not spend too much time examining the hardware -- there were more important matters to attend to that day.