These nine pins are arranged in the port as shown in rs232 connector pinout.
Rs232 female connector pins.
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For example on the original ibm pc a male d sub was an rs 232 c dte port with a non standard current loop interface on reserved pins but the female d sub connector on the same pc model was used for the parallel centronics printer port.
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Below is the pinout of a typical standard male 9 pin rs232 connector this connector type is also referred to as a db9 connector.
Some personal computers put non standard voltages or signals on some pins of their serial ports.
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The most recent version of the protocol is known as rs232c.
The rs232 protocol uses a 9 pin serial port that can have either male or female connectors.
Rs232 used to have 25 pin now it is shrunk to just 9 pin.
Rs232c retains the features of rs232 but uses 25 pins rather than a 9 pin serial pinout.
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The dce and dte ports are exactly similar except for the direction of data flow.
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.
New rs232 has nine pins as mentioned earlier.