INTRODUCTION:

This page is an attempt to educate those who are ignorant (not knowing) within the Electronics Industry of certain facts. Each subject has its own chapter.

D-SUBMINATURE CONNECTORS:

Many years ago, when the first D-Subminature connectors were developed and made available, a logical part numbering system was created for these connectors. Over the years, and especially with the younger generation and the Personal Computer industry, the original information was forgotten and now ignorance has taken over.

Here is the original part numbering system for the D-Subminature connectors:

1. The first letter identifies the connector as a D-Subminature (D),
2. The second letter identifies the size of the shell (A, B, C, D, E)
3. The third numbers identify the number of pins (9, 15, 25, 37, 50).

The so-called standard connectors were introduced in the following order:

1. DA-15 was used for industrial use then used for the PC game port
2. DB-25 was used for industrial communications, modems, control, etc, then used for the PC serial communication port.
3. DC-37 was used for industrial use and has remained there,
4. DD-50 was used for industrial use and has remained there,
5. DE-9 was introduced as the smallest "D" connector for industrial use, then was used for PC serial communications
6. DE-15 was used as a higher capacity, small connector, then was used for the PC colour video connector.

Somebody in the PC industry did not have this knowledge, and started to refer to the PC serial connector as DB-9 and the video connector as DB-15, and others within the industry have followed the lead of this first "somebody". The DB-9 identification is totally incorrect because a DB-9 connector is 9 pins in a B-sized shell (image a DB-25 with only 9 pins in the shell), and a DB-15 connector is 15 pins in a B-sized shell (image a DB-25 with only 15 pins in the shell).

The only way to overcome ignorance is with education, so from now on every time you encounter this situation, pass on the knowledge.

 

Contact BARADINE at info@baradine.com with any requirements you may have.