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the original Serial connectors used DB-25 connectors, it seems
people, not knowing the significance of the letter "B" (the shell size),
began to call all D-sub connectors "DB" connectors. Instead of
correctly saying DB-25, and DE-9 we have called all serial connectors
DB-. Today "DB-9" really means DE-9. Today you will see DE-9 connectors
sold as DB-9 more often than the correct terminology.
The letter after the D refers to the shell size, with DB referring to the common 25 pin size and DE for the 9 pin size. The error is so often repeated that there is no fixing it.
|1||DCD||Data Carrier Detect|
|2||RD||Receive Data (a.k.a RxD, Rx)|
|3||TD||Transmit Data (a.k.a TxD, Tx)|
|4||DTR||Data Terminal Ready|
|6||DSR||Data Set Ready|
|7||RTS||Request To Send|
|8||CTS||Clear To Send|
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