In computer networking, a serial port enables external modems to connect to a PC or network router via a serial cable. The term "serial" signifies that data sent in one direction always travels over a single wire within the cable.
The prevailing standard for traditional serial port communications historically has been RS-232. These serial ports and cables are the same used for PC keyboards and other computer peripheral devices (see sidebar). Serial ports and cables for RS-232 PCs generally feature 9-pin DE-9 connectors, although 25-pin DB-25 and other variations exist on specialized hardware. The alternative RS-422 standard applies on many Macintosh computers.
Both of these standards are gradually becoming obsolete in favor of USB or FireWire standard ports and serial communication.
Also Known As: COM port
For a standard DB 9 port connectors are as follows:
- Data Carrier Detect
- Received Data
- Transmitted Data
- Data Terminal Ready
- Signal Ground
- Data Set Ready
- Request to Send
- Clear to Send
- Ring Indicator
- ↑ AGG Software. 2011. http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm