US Robotics 3Com Manuel d'utilisateur télécharger pdf (Page 88)

TECHNICAL REFERENCE

8-37

The Serial Interface

The serial interface is a standard developed by the Electronic Industries

Association (EIA). It defines the signals and voltages used when data is

exchanged between a computer and a modem or serial printer.

The entire standard covers many more functions than are used in most data

communications applications. Data is transmitted between the devices over a

shielded serial cable with a 25-pin male (DB-25) connector to the modem and a

25-pin, 9-pin, 8-pin, or custom-built connector to the computer.

FCC regulations require the use of a shielded cable when connecting a modem to

a computer to ensure minimal interference with radio and television.

Pin assignments are factory-set in the U.S. Robotics modem to match the

standard DB-25 assignments in the following table. DB-9 connectors for

IBM/AT-compatible computers should be wired at the computer end of the cable

as shown in the DB-9 column.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 100 101

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US Robotics 3Com Manuel d'utilisateur Page 88