Boca HOME OFFICE Podręcznik Użytkownika Pobierz pdf (Strona 28)

HOME/OFFICE MODEM

Example: ATH or ATH0 tells the modem to disconnect

Extended commands were developed to provide greater

functionality and control over modem operations. Their

format is the same as the basic command except that an

additional parameter is required following the AT prefix and

before the numerical parameter. This additional parameter

comes in three different forms:

the ampersand (&) character: extended AT command

the backslash (\) character: extended AT command for MNP

the percent (%) character: extended AT command for V.42/V.42bis

Examples:

AT&K3 enables RTS/CTS (hardware-based) flow control. Flow control

compensates for the difference between the rate at which data reaches a device

and the rate at which the device processes and transmits.

AT\G1 enables flow control (software-based) (XON/XOFF) in MNP mode.

AT%E1 tells the modem to monitor line quality and request a “retrain”

(adjustment) to the connection.

S-Registers

Modem command “language” also employs a set of

indicators or registers, which are various numerical values

all with a standard “S” prefix, hence S-Registers. To a large

extent, the values defined in the S-Registers regulate the

operation of the modem and the function of some

commands in the AT command set.

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Boca HOME OFFICE Podręcznik Użytkownika Strona 28