US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guide de l'utilisateur télécharger pdf (Page 95)

TECHNICAL REFERENCE

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 ... 90 91 92 93 94 95 96 97 98 99 100

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US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guide de l'utilisateur Page 95