The reason for the 9 pin and 25 pin connectors is the 25 pin came along first.
Rs232 9 pin wiring.
Rs232 pin assignments db25 pc signal set pin 1.
Its original function was.
Do you need networked serial.
There are oodles of different types of rs232 cables but the only real difference is which pins of the rs232 port they actually use.
Rs232 pinout below is the pinout of a typical standard male 9 pin rs232 connector this connector type is also referred to as a db9 connector.
Rs232 connections and wiring up serial ports.
Then the rs232 wiring was condensed into the 9 pin connector a victim of evolution if you like.
This is the second of two unpaired handshake lines.
Data carrier detect after a data terminal is detected a signal is sent to the data set that is going to be transmitted to the terminal.
An rs232 pinout 9 pin cable features nine pins.
A computer s serial com port dte is usually a male port as shown below and any peripheral devices you connect to this port usually has a female connector dce.
Pin connections db9 9 way db25 25 way.