Pub. 42004-438M
300 Series Emergency Telephone Manual
Page 41 of 50
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-438M.docx
04/19
Output Four Control Setup
The command (DTMF key sequence) that triggers the timed activation of output four contact closure
(
TB5
) is configurable. The sequence can contain up to eight DTMF digits in the range 0–9. The first
digit must not be 0 (zero). Some examples of valid control sequences are: 87654321, 832, and even a
single digit such as 7. The duration of the activation (closure) of output four can be set in the range of 0.1
to 12.7 seconds in 0.1-second increments.
Table 11. Output 4 Control Options
Feature
Key
Sequence
Description
Default
Control
Sequence
N N..
* 8
Assigns the digits NN... as the command key sequence
that triggers the timed activation of output four. NN is a
sequence of 1–8 digits, with the first digit not zero. To
assign 726 as the control sequence, enter
7 2 6 * 8
.
90125
Duration of
Timed
Activation
# 2 6
N N N
Sets the duration of the activation of the Output 4 contact
when triggered by the control sequence. Use entries 001–
127, representing 0.1 second to 12.7 seconds in
0.1-second increments.
Use 000 to disable this feature.
To set a duration of 7 seconds, enter
# 2 6 0 7 0
.
5 seconds
Early Microphone Option
The microphone in each telephone activates only after the unit determines connection to the called party.
This will occur in one of two ways based on factory-default programming; when the telephone receives a
DTMF
*
from the called party, or when the telephone detects that no more ring-backs from the called
number are occurring. This ring-back determination may take 4–6 seconds to detect, rendering the
microphone non-active during that time.
Enabling early microphone activates the microphone when the telephone begins checking for ring-back
tones, typically within less than 1 second after the unit completes the dialing sequence Early microphone
operation will occur for both emergency and non-emergency call operation for all RED ALERT
®
emergency telephones when enabled.
Use of the early microphone feature includes an operational risk that ring-back tones can be missed, or
audio received by the microphone can be recognized by the telephone, causing it to operate as if the call
had been answered. This could prevent call
rollover
from occurring.
N
OTE
:
The early microphone feature should only be used if the telephone number being called by the
emergency telephone is attended 24 hours per day. If call rollover is desired, the appropriate feature
setting is
early microphone option
disabled.
