Can anyone tell me what is the difference between RS232 cable and a DB-9 connector?

Can anyone tell me what is the difference between RS232 cable and a DB-9 connector?

Answer 1

[Jan]

RS232 is the definition of the serial interface, e.g. the signal voltage and duration. DB9 is the 9 pin connector. RS232 connections are frequently implemented using these connectors, but there is a 25 pin connector also. But of course you can solder the cable to the devices directly also, without a DB9 or DB25 connector.

While this question has no relation to Matlab, it is very easy to find useful explanation if you ask an internet search engine. See e.g. https://www.lammertbies.nl/comm/cable/RS-232.html

[Walter Roberson]

RS232 also describes the protocol of which signals are to have what effect. RS232 gives names to the various signals.

However, RS232 does not talk about what the connectors should be or what order the pins should be.