VEGA Phoenix PSI Data Fax Modem - Manual (Page 80)

PSI-DATA/FAX-MODEM/RS232
5-10 692302
end with these digits are considered as valid. The number of preceding digits is of
no importance. The advantage of this is that various formats (e.g., +49 40 xxxxx
and 040 xxxxx) can be evaluated.
The flashing "AA" LED indicates that this mode is active. The call is only accepted
if the stored numbers match. The caller ID is also output.
5.5 DTMF
DTMF (Dual Tone Multiplexed Frequency) tones are created by superimposing two
tones from different frequency ranges. The tone lasts 100 ms and is followed by a
100 ms pause.
5.5.1 DTMF Alarm
Once the PSI-DATA/FAX-MODEM/RS232 has dialed a phone (an optional CLIP
decoder is useful for identifying the modem), the termination equipment (PC or
PLC) can generate a DTMF message.
An operator can acknowledge the message with a DTMF tone. The modifier L in
the dialing string (ATD1234….L;) enables the DTMF alarm function. After dialing,
the modem switches to command mode and can now output DTMF tones with the
dialing command (ATDT00000000;). In command mode, the device can detect
DTMF tones and forward them to the RS-232 interface.
DTMF: x<CRLF>
This message is output to the RS-232 interface, where x is the DTMF tone
(0 to 9,*,#).
As an alternative to ATDxxxL; the special dialing string ATDxxxK; can be used.
When the ATDxxxK; command is issued, the modem waits for five seconds of
silence after dialing (i.e., no dial tone means the partner has accepted the call).
The S7 timer is no longer valid in command mode.
The connection can only be can be aborted by the ATH or ATZ command.