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Extended AT Commands

Command Description

Data carrier detect (DCD) signal

AT&C0 Forces DCD signal to be on at all times. (default)

AT&C1 DCD on indicates presence of data carrier.

Data terminal ready (DTR) signal. Interprets the ON to OFF

transition of the DTR signal from the DTE according to the &Q

settings.

AT&D0 &Q0,5,6. DTR ignored.

&Q1,4. Modem hangs up; auto answer not affected.

&Q2,3. Modem hangs up; auto answer inhibited.

(default)

AT&D1 &Q0,1,4-6. Asynchronous escape sequence.

&Q2,3. Modem hangs up; auto answer inhibited.

AT&D2 &Q0-6. Modem hangs up; auto answer inhibited.

AT&D3 &Q0,1,4-6. Modem does a soft reset as if the ATZ

command were received;

&Q2,3. Modem hangs up; auto answer inhibited.

AT&F Recalls factory defaults. Instructs the modem to use

the factory set parameters.

DTE/Modem flow control

AT&K0 Disable flow control.

AT&K3 Enable RTS/CTS (default for data mode)

AT&K4 Enable XON/XOFF.

AT&K5 Enable transparent XON/XOFF.

AT&K6 Enable both RTS/CTS and XON/XOFF

(default for FAX mode)

Modem Command Reference

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Boca HOME OFFICE Guia do Utilizador Página 35