User's Manual
USER MANUAL V1.05
© 2013 EnOcean | www.enocean.com STM 320 / STM 320C / STM 320U User Manual V1.05 | Page 4/18
STM 320 / STM 320C / STM 320U
1 RELATED DOCUMENTS
For mechanical integration please refer to our 3D drawings found at
http://www.enocean.com/en/enocean_modules/stm-320/
2 GENERAL DESCRIPTION
2.1 Basic functionality
The radio transmitter module STM 320 from EnOcean
enables the implementation of a wireless magnet con-
tact sensor. Powered by a solar cell, it works absolutely
maintenance-free. An integrated energy store allows
operation for several days even in total darkness.
Key applications are window and door sensors.
The STM 320 supervises an integrated reed contact and
reports every status change immediately (open <>
closed). In addition a sign of life signal is transmitted
every 20-30 minutes.
A LRN button is pre-installed on the PCB. When this but-
ton is pressed a special teach-in signal is sent.
There are three frequency variants – STM 320 in 868 MHz, STM 320C in 315 MHz,
and STM 320U in 902MHz.
Features with built-in firmware
Pre-installed solar cell
On-board energy storage and charging circuit
On-board LRN button
On-board TX indicator LED
On-board reed contact
2.2 Technical data
Antenna
Pre-installed helical antenna installed
Frequency
315.0 MHz (STM 320C)
868.3 MHz (STM 320)
902.875MHz (STM 320U)
Radio Standard
EnOcean 902MHz/868 MHz/315 MHz
Data rate/Modulation type
125 kbps/ASK(868MHz, 315MHz) FSK(902MHz)
Radiated Output Power
STM 320: +5 dBm
1
(EIRP) ± 2.5 dB
2
STM 320C: +92 dBµV/m
1
± 2 dB
2
STM 320U: +99 dBµV/m
1
± 2 dB
2
Power Supply
Pre-installed solar cell
Illumination 50-100000 lux
Initial operation time in
darkness @ 25°C
typ. 6 days, min 90 hours
if energy storage fully charged
transmission of telegram every 25 min on average
3
1
Measured in test laboratory, measurement uncertainty 2.7 dB
2
Tolerance of measurement in production at 50 Ω