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Description: A very simple breakout board for the DB9 connector. Takes the 9 incoming signals and puts them into a breadboard friendly single row of 0.1" pins.

Bare PCB only. Please see related items for DB9 connector and pins.

Documents: Schematic

Comments 11 comments

  • This is niether Male nor Female dependant. I spent two days tracking down an issue and it turned out that I had the signals going to the wrong pins. Well, wasn’t a problem with the breakout board. I placed a female DB9 on the wrong side of the board.
    If you have a DB9F the place it on the same side as the silkscreening. If you have a DB9M then place it on the other side. This will place the silk screening on the correct header pins.

  • I think changing the name might confuse the 99.9% of us that have always referred to this as a DB9 (DB9F, DB9M, etc). Just go to Mouser and do a search for DE-9 vs DB9 and see which one helps you find the connector you are looking for. Might not be correct but its the commonly accepted term. (sorta like referring to all “facial tissue” as “Kleenex”?)

  • I’d love to see one of these for DB15 (vga connector)!

  • …There are silkscreening on both side, this is also confusing… If you have a female DB9, place it on the side where you can see the pinout for the breadboard. Or in other words; the side where there’s not sparkfun logo.

    We love you Sparkfun, this is clearly a breakout board for a FEMALE DB9…

  • SWR_DMaster is right. This is independent of connector gender. Turn the board upside down if you have a male connector.

  • fwiw,
    male: when looking directly at the pins of the male serial cable, the GND pin is far left on the 5-pin row, and CD is far right on the 5-pin row.
    female: when looking directly at the holes of the female serial cable, the GND pin is on the far right on the 5-pin row, and CD is far left on the 5-pin row.
    breakout board: the square pin is CD, and at the opposite end is GND.
    hopefully that’ll help to avoid confusion when it’s solder time. depending on the situation, it may be more useful for you to solder headers on the board to plug on female serial cable. do that with the pins' long ends on the side with the silkscreen text

  • Danger, Will Robinson!
    This is for mating with a DE-9 “male” connector (the current version - in red - has all pin names printed, not only TX/RX).
    If you solder a DE-9 “female” connector", you will have to ignore the pin descriptions on the breakout board because soldering order 1-2-3-4-5 becomes 5-4-3-2-1.

  • WARNING: Dead Horse Beating Ahead
    After a little more research, I think it’s more accurate to say that the DE-9 designation, while technically correct, is simply ‘outdated’. And this is why EEs don’t get invited to technicians' parties - we really don’t care that they know the entire history of the D-subminiature connector series. Sorry, not interesting. “Wikipedia what? - where’s that keg?"
    http://www.l-com.com/content/FAQ.aspx?Type=FAQ&ID=4878
    (Yeah, I know - this is why technicians have to have their own parties…)

  • I agree with xsk8rat. Please change the name to DE9.
    “DB9” makes you guys look like newbies.

  • Disclaimer: I know this only because i was just served at work by one of the EE’s. Using the wrong code really seemed to bother him.
    It’s really a “DE-9”. The “DB” denotes a 25 pin size connector.
    Check the standard:
    http://docs-europe.origin.electrocomponents.com/webdocs/0027/0900766b80027708.pdf
    And wikipedia:
    http://en.wikipedia.org/wiki/DE-9_connector#DE-9_connector


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