2
DE2295U
2. SPECIFICATIONS
2. SPECIFICATIONS
2. SPECIFICATIONS
2. SPECIFICATIONS
Transmission Type:
Radio Frequency (RF)
RF frequency (MHz):
433.92
Transmitter’s ID Code:
28-bit ID, Code Secure
TM
Modulation type:
pulse width modulation
Overall Message Length:
66 bit
Alarm Messages
: Tilt activated, pull-cord disconnected, Panic
alarm, each with separate ID
Power Source:
3.6 V, Lithium battery, size 1/2 AA / 1.2 Ah,
(Tadiran TL-2150 or equivalent.)
Current Consumption:
15
µ
A standby, 10mA (operation)
Battery Life Expectancy:
Up to 3 years (with regular use)
Battery Supervision:
Battery test every hour
Operating temperature:
0
°
C to 49
°
C (32
°
F to 120
°
F)
Dimensions
(H x W x D)
:
120 x 52 x 36 mm (4-3/4 x 2-1/16 x 1-5/16 in.)
With Holster
-
3
:
140 x 77 x 50 mm (5-7/16 x 3-1/16 x 1-15/16 in.)
Housing:
3mm ABS plastic box, weather proof
Weight:
Man-down -138 g (4.9 Oz.), Holster-3 - 30 g (1.05 Oz.)
Color:
Body - dark gray, buttons - brown, pull cord - black
Compliance with Std.:
FCC Part 15
Accessories:
Light weight water-resistant carry pouch Holster-3.
Metal
belt
clip.
Pull-cord
with
pin
and
cloth
clip.
3. FUNCTIONAL DESCRIPTION
3. FUNCTIONAL DESCRIPTION
3. FUNCTIONAL DESCRIPTION
3. FUNCTIONAL DESCRIPTION
3.1 Visual and Audible Warning Timing
A built-in tilt sensor activates the unit when the unit is tilted down
by more than 60
°
(see figure 3). When the unit is activated, it
enters a pre-alarm state for 30 seconds. This period enables the
user to return the transmitter to the normal (vertical) position, to
prevent an unintentional alarm transmission.
During this period an audible warning is sounded by the buzzer
and a visual warning is indicated (by the internal LED). The
buzzer’s sound can be disabled by using an internal buzzer’s
switch (see table 1). Figure 4 presents the timing diagram.
Prealarm time:
15 short beeps
+ 1 long beep
Buzzer
sound
0
30
t (sec.)
MDT-122 is returned
to normal position
before 30 sec.
0
30
MDT-122 is returned to
normal position after 30 sec.
ON
OFF
Part of
prealarm time
Transmission
and LED
0
30
t (sec.)
Alarm
Alarm
restore
ON
OFF
Figure 4 - MDT-122 Functional Timing Diagram
3.2 Low Battery Voltage Indication
The battery is automatically tested every hour, under load
condition. If the battery voltage is low, “low battery” message is
sent every transmission.
In addition, when the battery voltage is low, the LED blinks while
pressing the left or right push-button switch.
3.3 External Buttons Functions
(see fig. 2)
A.
Left or Right push-buttons
When left and right push-buttons are pressed, panic alarm is
transmitted.
B.
Tilt ON-OFF Slide Switch
By using this switch, the user can disable the tilt sensor
function (this is necessary when a guard goes off duty or
performs such activities that can activate the transmitter and
create a false alarm). When the unit is delivered from the
factory, the switch is in OFF position.
C.
Temp Tilt Off Push-Button Switch
The push-button is located at the top of the unit. It is used for
temporary
disabling (5 minutes) of the tilt sensor function,
when it is desired. To re-enable tilt function before the 5
minutes delay expires, the tilt ON-OFF slide switch should be
switched to OFF position and then to ON again.
3.4 Pull-Cord Function
(see par. 1C)
3.5 Internal DIP Switches Functions
Table 1 - Internal DIP Switches Functions
Switch Description Default
1 Buzzer
ON/OFF
ON
2
Pull-cord option
ON
3 (not
used)
OFF
4 (not
used)
OFF
5
(For future use)
-
6
Tilt alarm delay ON/OFF (*)
ON
*
Tilt Alarm Delay Enable/Disable
30 second pre-alarm delay enabled/disabled.
If the “tilt alarm delay” DIP switch is set to OFF position (no
delay) the tilt pre-alarm DIP switch position is disregarded.
3.6 Buzzer Functions
The internal buzzer sounds, as shown in figure 4 and in the
following situations:
A.
When someone is tampering / stops tampering with the unit.
B.
Whenever the internal DIP switch setting is changed.