The RS232 connector is a port that allows data to be exchanged between devices. It was created to transfer data between DTE (Data Terminal Equipment) or a computer and DCE (Data Communication Equipment) or a modem. Parallel data exchange posed constraints, which necessitated the use of RS232. RS232 is a serial communication standard that allows data to be sent bit by bit. Although speedier USB (Universal Serial Bus) eventually superseded RS232, it remains popular in some areas. More specs:https://www.utmel.com/componen....ts/rs232-connector-p