Answered Cant get my head around the logic in DB- connector shell sizes..

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Feast your eyes upon the above image, I can see the obvious pattern from DA-15 to DD-50 (as the pins increases the letter advances) but how does DE-9 come into it? cant find ant form of explanation on google so can anyone explain in laymans terms? hopefully someone will explain before tomorrow night when I will continue typing up my revision notes, will tag @SimonD, as he will more than likely have an explanation.

 

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They are just all types of 'D-Type' connector.

Only 9 pin and 25 pin variants are common in computers, they are the old forms of serial ports and also 25 pin used to be used for parallel ports also.

You also missed VGA which is a 15 pin 3 row variant of DE-15/HD-15.

"The D-sub series of connectors was invented by ITT Cannon, part of ITT Corporation, in 1952.[1] Cannon's part-numbering system uses D as the prefix for the whole series, followed by one of A, B, C, D, or E denoting the shell size, followed by the number of pins or sockets, followed by either P (plug or pins[2]) or S (socket) denoting the gender of the part. Each shell size usually (see below for exceptions) corresponds to a certain number of pins or sockets: A with 15, B with 25, C with 37, D with 50, and E with 9.[3] For example, DB-25 denotes a D-sub with a 25-position shell size and a 25-position contact configuration. The contacts in either row of these connectors are spaced 326/3000 of an inch apart, or approximately 0.109 inches (2.77 mm), and the rows are spaced 0.112 inches (2.84 mm) apart (the pins in the two rows are offset by half the distance between adjacent contacts in a row).[4] This spacing is called Normal Density."

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

 

Thanks but didnt answer the question in regards to DE-9 I get the 9 is related to the number of pins but what does the E relate to? As explained there seems to be a pattern between the increase of pins and the advancement of the letters but this pattern ends at DE-9.. or is this pattern not intentional? So E socket types just are called E and have 9 pins?

 

Yep E is a shell type, E is big enough for 9 pins, but as I mentioned it can also house 15 comfortably in the form of VGA connector.

Have a look at Maplins or RS Components, billions connectors, no point learning them all, just learn the computer specific ones.

SCSI-1 also used a 50 pin D-Type, but there is probably nobody on this forum that's ever used one, so testing on such stuff is pretty dubious.

 

Riiight.. I see now, but I do have one last question in regards to VGA, why isn't it classed as a DA-15 then? If Im making sense of what you're saying isnt class based on number of pins?

Thanks dmarsh, I'm new to hardware and trying to get the gist.

 

@dmash right Im with you now! And I get where I was going wrong thanks alot!