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RS-232 DB9 specification users reports and reviews

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There are 41 approved reports in our database

Date Content
User opinion Comment Approved by moderator?
INCORRECTThe IDC connector pinout does not seem to be correct. Isn"t pin 1 usually (indicated by *):APPROVED
INCORRECTArent the IDC headers usually noted with pin 1 to the right of the polarization key, looking at the top of the male header. Top right, as pictured, pin 10 should be labeled pin 1.
Another item that may create confusion is that some manufacturers decide to label the remaining pins across and then back down to the 2nd row (starting out right to left just like the top row). This becomes ambiguous when others decide to keep on jumping with the pin numbering inbetween the rows, such that one row contains odd and the other row contains the even numbered pins. Just depends who felt like it, or what the policy was at the time...
2009-03-27 19:24:50rev. 2CORRECTAPPROVED
2009-11-14 03:34:33rev. 4CORRECTAPPROVED
2010-09-29 01:31:50rev. 5CORRECTAPPROVED
2011-02-22 16:46:23rev. 5INCORRECT10 pin DC male APPROVED
2011-11-30 21:24:38rev. 5CORRECTAPPROVED
2011-12-15 13:21:32rev. 5CORRECTAPPROVED
2012-01-16 15:50:11rev. 6CORRECTAPPROVED
2012-03-02 03:14:31rev. 6CORRECTAPPROVED
2012-06-21 11:13:12rev. 7CORRECTAPPROVED
2012-07-16 18:51:59rev. 7CORRECTNo.APPROVED
2012-07-25 20:28:58rev. 7CORRECTnone that I know ofAPPROVED
2012-08-10 05:04:08rev. 7CORRECTlooks goodAPPROVED
2012-12-08 08:29:05rev. 7CORRECTAPPROVED
2013-04-05 16:33:47rev. 7CORRECTAPPROVED
2013-04-05 16:36:33rev. 7INCORRECTthe 10 pin IDC male connectorat the inside, at motheboard picture is incorrect.APPROVED
2013-04-06 14:46:29rev. 7CORRECTGreat! Thanks! Pinout mentioned here is correct! :-)APPROVED
2013-04-29 01:11:56rev. 7CORRECTAPPROVED
2013-09-08 13:38:39rev. 9ERROR FIXEDimage of 10 pin IDC is incorrect (09/09/2013) IDC is: first row with noth second row without notch BUT there is 2 flavor of header (ex: Motherboard header) (AT/EVEREX) or (DTK/EVEREX) witch "match" the IDC10. But the pinout layer DIFFER ! (DTK/INTEL) 1-DCD 2-DSR 3-RXD 4-RTS 5-TXD 6-GTS 7-DTR 8-RI 9-GND 10-- (AT/EVEREX) 1-DCD 2-RXD 3-TXD 4-DTR 5-GND 6-DSR 7-RTS 8-CTS 9-RI 10-- You need an according port ( with the accordingly cable layout) to the flavor of header you have! Example: If ou want to have a DB9 put on a 10pinIDC you HAVE TO put an RS-232 Port with pitch header (DTK/INTEL) or with pitch header (AT/Everex) depending of the flavour of the pinout layer! APPROVED
2014-02-03 16:29:15rev. 10CORRECTAPPROVED
2014-03-13 01:52:24rev. 13CORRECTAPPROVED
2014-04-17 06:58:26rev. 13CORRECTAPPROVED
2014-08-28 21:12:32rev. 13CORRECTMinor corrections and spelling fixes would be useful: e.g. correction of the word 'swiches' (should be 'switches') and the addition of a few 'the' & 'and' to make the document more readable.APPROVED
2015-02-08 08:46:03rev. 15CORRECTAPPROVED
2016-03-08 23:55:51rev. 16CORRECTPinout refers to the Male connector; you got it correct.APPROVED
2016-06-09 17:12:46rev. 16CORRECTAPPROVED
2016-09-29 10:23:20rev. 16CORRECTAPPROVED
2016-12-13 17:24:02rev. 16CORRECTAPPROVED
2017-01-04 18:40:56rev. 16CORRECTAPPROVED
2017-02-12 17:06:34rev. 16CORRECTAPPROVED
2017-02-28 15:42:37rev. 16CORRECTAPPROVED
2017-03-08 23:29:08rev. 16CORRECTAPPROVED
2017-11-06 16:49:24rev. 17ERROR FIXEDPin 5 is referred to as GND or ground but should be labeled 0V or COM/common. Ground should be used to denote connection to earth ground and not a power supply common rail. Of course some power supply commons are tied to earth but we dont call them earth or ground, we still call them common or earthed/grounded common.APPROVED
2018-05-02 19:30:33rev. 20CORRECTAPPROVED
2019-06-07 15:18:12rev. 20ERROR FIXEDThe diagram is "wide side" up, whereas the picture is "wide side" down, causing confusion. Rotate the picture 180 degrees.APPROVED
2019-07-17 00:08:16rev. 20CORRECTAPPROVED

History of users contributions

Date Content
Author Comment
2009-08-07 21:12:16rev. 4
2009-08-15 13:51:32rev. 4
2012-01-15 14:47:48rev. 5just added a column for newer motherboards.
2012-05-05 21:30:12rev. 7Table column was wrongly labelled 'DB-9'!
2012-07-03 16:30:21rev. 7Correcting
2012-11-16 20:56:38rev. 7
2012-12-04 17:16:32rev. 7
2015-05-18 13:41:39rev. 15Thomas EnglandSetting some grammar mistakes correct in header and start of body

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should be correct