AT&T DataPort PCX Modem Guia do Utilizador descarregar pdf (Página 81)

Glossary

GL-9

Issue 3 October 1995

RPI (Rockwell Protocol Interface)

A technique for modem/computer communication that permits

data compression and error control services to be provided by

the computer.

RS-232

An Electronic Industries Association’s standard defining the

25-position interface between data terminal equipment and data

communications equipment.

RTS

Request To Send. A signal from the computer to the modem,

sent via Pin 4 of an RS-232 interface, that states the computer

has data to send.

RXD

Receive Data. Pin 3 of an RS-232 interface that is used by the

computer to receive data from the modem. Conversely, the

modem uses Pin 3 to transmit data to the computer.

S-register

A part of the modem’s memory that contains values that

determine the modem’s operating characteristics.

synchronous transmission

Data transmission that is synchronized by timing signals.

Characters are sent at a fixed rate. This type of transmission is

more efficient than asynchronous transmission.

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