this post was submitted on 02 Aug 2024
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Because the connector you think of as DB-9 is ackschually a DE-9 connector. A DB-9 connector would somehow be the width of those 25-pin parallel port connectors, but holding only 9 pins.
D is for D-subminiature
Second letter is the connector housing size (A through E)
The number is the amount of pins.
ackschually a DB-9 connector has no meaning as low and high density pin counts are specified for the d-sub series, and db-9 is an impossible combination.