Vega Phoenix PSI Data Fax Modem Bedienungsanleitung PDF herunterladen (Seite 81)

Special Functions

692302 5-11

5.5.2 DTMF Control

The modem is called by a telephone or calls a telephone. The partner uses DTMF

tones and sends control characters to the modem. The modem decodes these and

outputs the characters to the serial interface.

In order that the modem can be called, this function must be enabled with the ATR1

command. Once the modem has accepted the call, it waits for five seconds for the

DTMF start character (#). If the character is detected, the modem switches to

command mode and sends a signal tone to the partner.

If no start character is detected, the modem starts with the standard modem

handshake. In command mode, the detected DTMF tones are output to the

interface. The start character is not forwarded to the interface.

The S7 timer is no longer valid in command mode.

The connection can only be can be aborted by the ATH or ATZ command.

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Vega Phoenix PSI Data Fax Modem Bedienungsanleitung Seite 81