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support.dell.com I/O Ports and Connectors B-1 This file provides specific information about the input/output (I/O) ports and connec-tors on the back panel of the computer system.The I/O ports and connectors on the back panel of the system are the gatewaysthrough which the computer system communicates with external devices such as akeyboard, mouse, printer, and monitor. Figure B-1 identifies the I/O ports and connec-tors for your system. The two built-in serial ports use 9-pin D-subminiature connectors on the back panel.These ports support devices such as external modems, printers, plotters, and micethat require serial data transmission (the transmission of data one bit at a time overone line).Most software uses the term COM (for communications) plus a number to designatea serial port (for example, COM1 or COM2). The defaults for your system's built-inserial ports are COM1 and COM2.The built-in parallel port uses a 25-pin D-subminiature connector on the system's backpanel. This I/O port sends data in parallel format (where eight data bits, or one byte,are sent simultaneously over eight separate lines in a single cable). The parallel port isused primarily for printers.Most software uses the term LPT (for line printer) plus a number to designate a paral-lel port (for example, LPT1). The default for the system's built-in parallel port is LPT1. |
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