GAI-Tronics IPE2500A, IPE2500A-MLS Paging Encoder / Desktop Controller User and Installatoin Manual - Manual (Page 39)

IPE2500A and IPE2500A-MLS Paging Encoder/Desktop Controller Operation
33 03/12
Direct DTMF Dialing Using Immediate DTMF Paging
If DTMF paging is enabled, it is possible to use the immediate DTMF paging feature to generate DTMF
digits as well. The operation of direct DTMF dialing in the mode of operation is the same as timed direct
DTMF dialing with the hang time being 2 seconds instead of the configured direct DTMF hang time.
Note that if direct DTMF dialing is not enabled, immediate DTMF paging can still be used for generation
of DTMF digits. Refer to the immediate DTMF paging section of the operator’s manual for more
information.
Audio Transmissions during Direct DTMF Dialing
During direct DTMF dialing, the transmitter remains keyed for the direct DTMF hang time for timed
direct DTMF dialing or while the handset PTT is pressed during PTT-controlled direct DTMF dialing.
Voice audio will be transmitted from either the internal or handset microphone while no DTMF digit is
being generated. Upon ending the voice audio transmission by releasing the main
TRANSMIT
button or
handset PTT bar, the unit will return immediately to receive mode.
Enabling Direct DTMF Dialing
As shipped, Direct DTMF Dialing is disabled. In order to utilize this feature, Direct DTMF Dialing must
first be enabled and configured. To enable Direct DTMF Dialing, the internal diagnostics must be
accessed by cycling power on the unit and pressing one of the four programmable buttons when lit during
the boot cycle. Upon entering diagnostics, the unit will flash the four programmable buttons and display
“MAIN DIAGNOSTICS.” Pressing the
PAGE
button accesses the Direct DTMF Dial menu.
To toggle the feature on and off, press the PAGE button repeatedly. Each time the feature is enabled, the
direct DTMF hang time will be defaulted to 500 ms. The direct DTMF hang time is how long the unit
will continue to transmit after the release of a DTMF button. This time is programmable from 100 ms to
5000 ms (5 seconds) and is nonvolatile. The setting of this time is critical based on the intended
application of the feature.
For example, using timed direct DTMF dialing, if the hang time is set to 500 ms and a two-digit DTMF
sequence is required, the operator will have 500 ms from the release of the first DTMF button to press
the second DTMF button. If the operator does not press the second button within the 500 ms, the
transmission will cease and will be restarted when the second digit is pressed. While some devices may
accept this, the loss of carrier by the receiving device may cause the first digit of the sequence to be
discarded or ignored. In addition to the 500 ms between DTMF button presses, the unit will remain
keyed for the direct DTMF hang time after the last DTMF button in the sequence is released upon which
the unit will return to receive mode.
In two-wire, half-duplex configuration, if the receiving device provides an acknowledgement tone after
receiving a particular DTMF sequence, it must wait for the direct DTMF hang time before transmitting
the acknowledgement. Otherwise, the unit will be transmitting and the operator will not hear the
acknowledgement. If the receiving device cannot be configured to wait the direct DTMF hang time,
four-wire, full-duplex configuration should be used. In this configuration, receive audio is always
available to the operator, even while the unit is transmitting.
To change the direct DTMF hang time, use the UP/DOWN or Volume UP/DOWN buttons. Once the
desired direct DTMF hang time is selected, press the
TRANSMIT
button to exit direct DTMF dialing
configuration. A second press of the
TRANSMIT
button will cause the unit to exit diagnostics and reboot.