Helmholz 700-751-HSM11, Manual, Page: 33 / 99

Helmholz Modem 56k 4.1 33
5.10 Remote Switching and Remote Query via DTMF
In phone networks, DTMF is used to dial a remote terminal. To
enable switching centers to distinguish between voice and DTMF
digits, these digits are created from two unique frequencies,
which cannot be created by people in this form. These tones are
created with the keys of fixed network and mobile phones.
With the help of DTMF (Dual Tone Multiple Frequency), the sta-
tus of inputs and outputs can be queried.
5.10.1 Preparation
Activate DTMF mode
Deactivate DTMF mode
Save settings (optional)
After the activation the modem is set into receive mode for in-
coming calls.
At the start of the DTMF mode connection, the PIN number is
prompted. The default setting is “0000”.
The PIN consists of 4 digits and may be changed any way. The
change is immediately stored in the permanent memory. First,
the previous PIN must be entered, then the new PIN. Afterwards,
the new PIN must be entered once more for confirmation.
AT\D1
AT\D0
AT&W
AT&W1
AT*C1
OLD PIN
1234
NEW PIN
4567
Confirm
4567