Inovonics EN1941 - Manual (Page 2)

4.9.13 06287E © Inovonics, 2013 - www.inovonics.com 2
3 One-Way Binary RF Module Dimensions
Figure 4 E*1941 One-Way Binary RF Module Dimensions
4 One-Way Binary RF Module Connections and
Output Jumpers
5 Installation
A Connecting the One-Way Binary RF Module
B One-way binary RF modules are designed to be easily interfaced with
your electronic remote application controller, however integration must
conform to the following:
C The RF module must only be connected at the eight pin header or eight
pin plated thru-holes.
D All cables and wires must be routed away from the component side of
the RF module.
E The integrated antenna must not be tampered with; no connection to an
alternate antenna is provided.
F The application module must not include an integrated secondary
colocated radio module.
G The one-way binary RF module antenna should be placed so that it is
facing away, or otherwise isolated from, your device’s ground plane.
H Components that are sensitive to RF transmission, such as high gain
circuits, should be isolated from the antenna to prevent interference.
I One-way binary RF modules should not be mounted on metal surfaces
or inside metal enclosures. They should also not be mounted where
sheet metal ductwork, wire mesh screens, etc. might block
transmissions.
J The RF module should be integrated so the antenna is unobstructed by
the end user’s PCB, batteries, or any other conductive material.
Figure 5 The RF module should be integrated so the antenna is
unobstructed
6 One-Way Binary RF Module Requirements
6.1 Power Requirements
The E*1941 has an on-board voltage regulator. Connect power cabling to
an external power supply (Vcc) of 2.4 to 5.5 volts. Voltage must be
sustained at 2.4 volts or above and supply 100 milliamps during the
transmit cycle.
6.2 EN1941
Assuming check-in messages every 3 minutes and infrequent alarm
messages (one per day, on average), the average current draw is 32 uA.
Peak current draw while transmitting is less than 100 mA. One alarm/
restore cycle per hour results in about 5.3 uA increase in average current.
6.3 EE1941
Assuming check-in messages every 12 minutes and infrequent alarm
messages (one per day, on average), the average current draw is 15 uA.
Peak current draw while transmitting is less than 50 mA. One alarm/restore
cycle per hour results in about 5.3 uA increase in average current.
6.4 Low Battery Condition
The E*1941 measures battery voltage every three and a half hours, and,
when the battery measures 2.4 volts, a serial message is sent indicating a
low battery condition.
6.5 Temperature range
-40°C to +66°C, non-condensing
6.6 RF network compatibility
EchoStream Commercial Mesh Network
6.7 Input Requirements
Caution: Input levels must not exceed 3.3 V.
Open When an active source (open collector or dry contact) is used to drive
the alarm or tamper input, the voltage should be between 0.75xVcc and
Vcc. A passive input should have an impedance of greater than 5.1k ohm
between the input and ground.
Closed When an active source is used, the voltage should be less than
0.25xVcc. A passive input should have an impedance of less than 240
ohm.
6.8 LED Requirements
The LED output is an active output from the microprocessor, with a 1k
series resistor to limit current draw. Default state is low, and the LED pin is
pulled high during transmit.
Connecti
on Output Jumper
N/O Output Jumper
N/C
Primary
Alarm
Open Alarm Clear Alarm
Ground Alarm Alarm Clear
Secondary
Alarm
Open Alarm Clear Alarm
Ground Alarm Alarm Clear
Tamper
Open Alarm Alarm
Ground Alarm Clear Alarm Clear
Reset
Open for normal operation; connect to the ground and
release for a board reset.
1.3”
Pitch:
2.54mm.
.385” to
Center of
First Pin
.090” to
Center
of First
Pin
.335” to
Center
of Hole
.515” to
Center of
Hole
.156”
Diameter
.5”
2.525”
End user
application
printed circuit
board
RF
module Clear transmit
region in front
and back of
antenna