Epson CW3S20A Bedienungsanleitung PDF herunterladen (Seite 133)

MS-DOS uses labels to refer to the various I/O ports on your

computer. The RS232C serial port is assigned the “COM1”

(Communications port #l). Additional serial ports can be

added to your computer, which MS-DOS would label COM3,

COM4, and so on.

Parallel Ports

Unlike serial ports, parallel ports allow your computer to

communicate one entire byte at a time. Eight wires are

included in the cable to permit the transmission of each of the

eight data bits simultaneously. Extra wires are included in the

cable for control signals. Your Computer uses the industry

standard “Centronics-compatible” parallel printer port

interface.

Connecting Printers

Most, but not all, printers use the Centronics-compatible

parallel port.

To install this type of printer, connect an appropriate cable

between the parallel port connector on the rear panel of the

system motherboard in the main system unit and the input

connector on the printer. Information on the correct cable will

be found in your printer’s manual.

Note

Some printers, like the HP LaserJet, can use the RS232C

serial interface port. See the printer’s manual for complete

installation instructions.

Connecting Modems

Modems are used to connect your computer to the telephone

line. Since the electronic requirements for the transmission of

7-4

Expanding Your System

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Epson CW3S20A Bedienungsanleitung Seite 133