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2. Basic System Board Setup > 13. Configure Serial Ports

Configure Serial Ports

Starting with a clean, industry-standard serial port configuration can save hours of headaches when you’re ready to add more devices.

If you currently or eventually will have to connect your PDA, a modem, a GPS unit, an uninterruptible power supply to protect your PC, or something else to a COM port, leave the COM port(s) enabled with a known configuration. If you know for sure how your ports are configured, it makes using them much easier.

There are several ways to tell if you have one or more COM ports on your system:

  • Look at the back (sometimes the front for some COMPAQ and HP systems) of your PC to see if there is a connector with nine small male pins in two rows—one of five pins, the other of four pins, surrounded by a trapezoidal or D-shaped metal shell—or a connector with 25 male pins in two rows of 13 and 12, respectively. These are known as DB-9 male and DB-25 male connectors, respectively. Only serial ports have this style of male connectors.


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