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Interesting use for a DE9 connector


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#1 jhd ONLINE  

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Posted Fri Apr 21, 2017 10:47 AM

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.



#2 Shawn OFFLINE  

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Posted Sun Apr 30, 2017 8:08 PM

DB9 not DE9 right?



#3 BigO OFFLINE  

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Posted Sun Apr 30, 2017 8:11 PM

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...bminiatures.svg

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


Edited by BigO, Sun Apr 30, 2017 8:14 PM.


#4 mr_me OFFLINE  

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Posted Mon May 1, 2017 4:25 AM

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.

#5 7800fan OFFLINE  

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Posted Mon May 1, 2017 11:27 PM

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



#6 Osgeld OFFLINE  

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Posted Wed May 3, 2017 8:04 AM

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



#7 carlsson OFFLINE  

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Posted Thu May 4, 2017 4:54 PM

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

http://pinouts.ru/Po...se_pinout.shtml

 

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

http://connector.pin...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.



#8 Osgeld OFFLINE  

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Posted Thu May 4, 2017 5:17 PM

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 



#9 tschak909 OFFLINE  

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Posted Thu May 4, 2017 5:46 PM

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



#10 jhd ONLINE  

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Posted Fri May 5, 2017 9:52 AM

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

http://pinouts.ru/Po...se_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.  :woozy:  






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