Normally the RS232 serial port is used for external modems, and in older systems for the mouse and The serial port found on Personal Computers uses a 9-pin connector. The RS232 specification only defines the pin-out for a 25 pin DĬonnector how ever, the 9 pin is used more often (defined by EIA-574). 9-Pin RS232 Null Modem Pinout DB9Ī Null Modem cable is identified by the gender of the connectors attached to the cable ends.Ī Null Modem cable will have either a Male-to-Male or Female-to-Female interface on both ends of the cable.Ī Male-to-Female cable would be a 'normal' RS232 cable. RS232 9-Pin Null Modem cable Pinout is use when connecting twoĪ Null Modem Adapter converts any straight-through wired cable into a null modem "cross-wired" configuration.
The RS232 interface is no longer being supplied with many new computers. The maximum RS232 cable length is a little less then 20 meters.įor a detailed description of the RS232 bus standard refer to the EIA-232 Bus page. Normally the RS232 interface is asynchronous. RS-232 uses Asynchronous Framing with NRZ encoding. The 9-pin serial port pinout is located in the table below. Information and pinout data for the older Apple computers are found on the Apple Computer RS-232 Buses page. Is now made up of either a USB port or an Ethernet port. The RS232 serial port was also found on the Apple The IBM compatible series of personal computers use the RS232 interface
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