7.24.19 357-06288F-01 Rev A © Inovonics, 2019 - www.inovonics.com 2
4 One-Way Serial RF Module Connections and
Output Jumpers
5 Installation Notes
• The RF module must only be connected at the eight pin header or
eight pin plated thru-holes.
• All cables and wires must be routed away from the component side of
the RF module.
• The integrated antenna must not be tampered with; no connection to
an alternate antenna is provided.
• The application module must not include an integrated secondary
colocated radio module.
• The one-way serial data RF module antenna should be placed so that
it is facing away, or otherwise isolated from, your device’s ground
plane.
• Components that are sensitive to RF transmission, such as high gain
circuits, should be isolated from the antenna to prevent interference.
• One-way serial 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.
6 One-Way Serial RF Module Requirements
6.1 Timing Requirements
All data is sent at a default rate of 9600 baud, no parity, 8 data bits and one
stop bit. The data is transmitted least significant bit first.
6.2 Power Requirements
The EN1941XS has an on-board voltage regulator. Connect power cabling
to an external power supply (Vcc) of 2.6 to 5.5 volts. Voltage must be
sustained at 2.6 volts or above and supply 100 milliamps during the
transmit cycle.
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 with the maximum payload size results in approximately a
23mA increase in the average current.
6.3 Low Battery Condition
The EN1941XS measures power supply voltage every three and a half
hours, and, when the voltage measures 2.6 volts, a serial message is sent
indicating a low battery condition.
6.4 Temperature Range
-20°C to +60°C, non-condensing
6.5 RF Network Compatibility
EchoStream Commercial Mesh Network
6.6 Payload size
50 bytes maximum
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 Serial I/O - UART logic-levels
Input levels must not exceed 3.3 V. Output levels are limited to 3.3 V,
maximum.
Data in pins Vih (minimum high level input voltage): 0.75xVcc
Data in pins Vil (maximum low level input voltage): 0.25xVcc
Data out pins Voh (minimum high level output voltage): Vcc - 0.25 at Ioh: -
1.5mA
Data out pins Voh (minimum high level output voltage): Vcc - 0.6 V at Ioh: -
6mA
Data out pins Vol (maximum low level output voltage): 0.25 V at Iol: 1.5mA
Data out pins Vol (maximum low level output voltage): 0.6 V at Iol: 6 mA
6.9 UL2560 Requirements
• The EN1941XS one-way serial RF module is a UL2560 unlisted
component.
• The compatible receiver for UL 2560 installations is the EN6040-T
network coordinator. Refer to the EN6040-T Network Coordinator
Installation Instructions.
• For UL 2560 installations, the RF module must have a minimum
check-in time of 60 minutes.
• The compatible repeater for UL 2560 installations is the EN5040-20T.
• In a UL 2560 installation, the EN1941XS one-way serial RF module
may be used with completed emergency call systems for assisted
living and independent living facilities
• For UL 2560 certified system installations, the following Inovonics
EchoStream devices are approved for installation within maximum
system configuration limits defined in section 1.1 of this document:
- EN6040-T network coordinator.
- EN5040-20T high power repeater.
- End devices (transmitters) with a minimum 60-minute check-in
interval, as follows:
Fundamental devices which are subject to UL2560 certification
(pendant transmitters and OEM products using the Inovonics RF
module)
Supplemental devices which are not subject to UL2560 system
certification but which may be used within a UL2560 certified
system (e.g. universal transmitters and activity sensors)
• Users that have achieved certification and will install UL 2560 certified
systems are responsible for labeling all fundamental devices with the
UL 2560 system certification mark.
7 Specifications
Output power: 25mW.
Firmware revision: 90651, v1.1.
8 Compliance Requirements
8.1 FCC Requirements for the EN1941XS
The EN1941XS one-way serial data RF module has received a Limited
Modular Grant, requiring Inovonics to retain control of the final installation
to ensure compliance to FCC/IC regulations. The integrator is responsible
to test the final installation to verify compliance to FCC/IC regulation for
unintentional emissions.
Prior to marketing the product, the integrator must complete and submit to
Inovonics a compliance review form and documentation, and, if requested,
a functional product sample for approval. If this is not possible, the
integrator must perform the testing themselves and submit proof to
Inovonics of compliance to Part 15 of the FCC Rules and Industry Canada
RSS-210.
At the end of this guide is an Inovonics compliance review form to be filled
out by the integrator.
The integrator is also responsible for properly labeling the product
containing the one-way serial data RF module. Labels must be placed on
Connection Output Jumper N/C
Primary Alarm
Open Alarm
Ground Alarm Clear
Secondary
Alarm
Open Alarm
Ground Alarm Clear
Tamper
Open Tamper
Ground Tamper Clear
Reset Open for normal operation; connect to the ground and
release for a board reset.
