EnOcean STM250 User Manual
Radio Magnet Contact
STM 250
User Manual V1.3
March 2005
Revision History
The following major modifications and improvements have been made to the previous version
of this document (V0.9):
Version Major Changes
V1.0 • Chapter 2.5: The bits LRN and STATE in DATABYTE_3 have been inverted
• Chapter 3.2: Recommendations for suited magnets and positioning added
V1.1 • Chapter 1.5 “Physical Dimensions of Magnet Housing” added
• Chapter 2.6 “Learning” fully revised and renamed
• Chapter 2.3 “Radio Telegram” revised
• Chapter 3.2 “Recommendations for Magnet Positioning” revised
V1.2 • Chapter 2.5: The bits LRN and STATE in DATABYTE_3 have been defined in final:
(LRN=”0”:“LRN-pushbutton pressed” and STATE=”0”:“No magnet presence”)
V1.3 • ESD protection: Note added that STM250 is qualified for the use within building
automation & installation, not for industrial applications (chapter 1.2)
• Switch over time defined to ≥ 80ms (chapter 1.3)
• Cyclic presence signal time defined to 5-30 minutes, typ. 15 min (chapter 1.3)
• Update of Solar Energy Balance Calculation (chapter 1.3 and 2.2)
• Energy storage: Notes added concerning Goldcap configuration and concerning
reduced component life time at continuously operation temperatures higher than
50°C (chapter 2.2)
• Mounting note added, that the receiver unit should not be placed at the same
plane as the STM250 when STM250 is mounted on a metal surface (chapter 3.1)
V1.4 • FCC/IC Approval Requirements added (chapter 3.6)
Published by EnOcean GmbH, Kolpingring 18a, 82041 Oberhaching, Germany
www.enocean.comT, info@enocean.com, phone ++49 (89) 6734 6890
© EnOcean GmbH, all Rights Reserved
Important!
This information describes the type of component and shall not be considered as assured characteristics. No
responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change
without notice. For the latest product specifications, refer to the EnOcean website: http://www.enocean.com.
As far as patents or other rights of third parties are concerned, liability is only assumed for devices, not for the
described applications, processes and circuits.
EnOcean does not assume responsibility for use of devices described and limits its liability to the replacement of
devices determined to be defective due to workmanship. Devices or systems containing RF components must meet the
essential requirements of the local legal authorities.
The devices must not be used in any relation with equipment that supports, directly or indirectly, human health or life
or with applications that can result in danger for people, animals or real value.
Components of the devices are considered and should be disposed of as hazardous waste. Local government
regulations are to be observed.
Packing: Please use the recycling operators known to you. By agreement we will take packing material back if it is
sorted. You must bear the costs of transport. For packing material that is returned to us unsorted or that we are not
obliged to accept, we shall have to invoice you for any costs incurred.
©EnOcean GmbH, A. Anders
Page 2 of 24
STM 250 User Manual V1.3
Table of Contents
1. GENERAL DESCRIPTION ______________________________________________________________ 4
T
1.1 Basic Functionality __________________________________________________________________ 4
1.2 Typical Applications_________________________________________________________________ 5
1.3 Features Overview __________________________________________________________________ 5
1.4 Dimensions of Reed Contact Unit __________________________________________________ 6
1.5 Dimensions of Magnet Unit _________________________________________________________ 8
1.6 Environmental Conditions __________________________________________________________ 9
1.7 Ordering Information _______________________________________________________________ 9
2. FUNCTIONAL DESCRIPTION __________________________________________________________ 10
2.1 Block Diagram______________________________________________________________________ 10
2.2 Solar Energy Balance Calculation _________________________________________________ 12
2.3 STM 250 Radio Telegram __________________________________________________________ 15
2.5 Serial Data Communication via Receiver Device RCM 120 _______________________ 17
2.6 Learn Pushbutton – Learning of STM 250 to a Receiver _________________________ 18
3. APPLICATIONS INFORMATION _______________________________________________________ 19
3.1 Unit Mounting ______________________________________________________________________ 19
3.2 Recommendations for Magnet Positioning _______________________________________ 19
3.3 Transmission Range _______________________________________________________________ 21
3.4 CE Approval Requirements ________________________________________________________ 21
3.5 FCC/IC Approval Requirements ___________________________________________________ 22
4. TOOLS __________________________________________________________________________________ 23
4.1 Evaluation Kit EVA 100 ____________________________________________________________ 23
4.2 Field Intensity Meter EPM 100 ____________________________________________________ 23
5. DECLARATION OF CONFORMITY______________________________________________________ 24
©EnOcean GmbH, A. Anders
Page 3 of 24
STM 250 User Manual V1.3
T
1. GENERAL DESCRIPTION
STM 250 is a wireless magnet contact. The radio sensor is powered by a small solar
cell and by that it works absolutely maintenance-free. An integrated energy store
allows operation for several days even in total darkness.
The reed contact housing and the magnet housing are very small. This means that
the EnOcean magnet contact is unobtrusively mountable at every window frame
made of aluminum, plastic or wood.
1.1 Basic Functionality
The STM 250 supervises an integrated reed contact and reports every status change
immediately (open<>closed). In addition a sign of life signal is send every 12 minutes.
Energy Store (GOLDCAP)
Teach-in Indication LED
©EnOcean GmbH, A. Anders
Figure 1: Wireless magnet contact STM 250
each-in Pushbutton
Magnet Contact
Figure 2: STM 250 PCB (open case)
Page 4 of 24
(Reed)
Antenna
(Helix)
STM 250 User Manual V1.3
1.2 Typical Applications
• STM 250 is designed and qualified for the use in building automation &
installation, not for industrial applications (in cause of ESD protection)
• Typical applications are window, flap and door monitoring
The STM 250 serves the 868 MHz air interface protocol of EnOcean. Together with the serial
interface output of receiver device RCM 120, this product can be easily integrated into
different application-specific system solutions.
The STM device is part of a powerful RF system solution from EnOcean for operation and
control applications. Because the RF transmitters are self-powered (no batteries),
maintenance-free RF systems can be implemented.
1.3 Features Overview
Power supply: ...................................... provided by a optical cell (Solar Power Generator)
Antenna:...................................................................................... internal helix antenna
Frequency / transmission power / modulation type:...... 868.3 MHz / max. 10 mW / ASK
Data rate / channel bandwidth: ...................................................... 120 kbps / 280 kHz
Telegram packet length (sub-telegram):................................................ 0.7 ms +/-5%
No. of (redundant) packets:.................................... 3 – 5 (depending on residual energy)
Transmission range: .................................................... 300m free field, typ. 30m indoor
Device identifier: ............................................... individual 32-bit ID factory-programmed
EnOcean telegram type: ............................................................ 1BS (One Byte Sensor)
Spontaneous wake-up: .........................1 x internal reed contact, switch over time ≥ 80ms
Cyclic Presence signal:...........................................every 5 - 30 minutes, typ. 15 minutes
Sleep mode current consumption: .................................................................. ≈ 25 nA
Operation startup time with empty energy store: ............................ < 10 min @ 400 lx
Illumination time for loading empty energy store to 14h operation in total
darkness: .................................................................. ≈ 5 h @ 1000 lx, ≈ 13 h @ 400 lx
Illumination time for reloading energy store from device working limit to 14h
operation in total darkness: ..................................... < 20 min @ 400 lx, < 1 h @ 100 lx
Maximum operation time during total darkness: ........................................ > 6 days
1)
Energy store is filled up @ 400 lx to 90% of capacity
©EnOcean GmbH, A. Anders
Page 5 of 24
STM 250 User Manual V1.3
1)
Teach-in pushbutton: .............................................on-PCB (operating at open case only)
Indicator for teach-in telegram transmission: .................... on-PCB Light Emitting Diode
(beside teach in pushbutton)
A change of the REED CONTACT status or pushing the teach-in button will wake the
transmitter unit to send a radio telegram immediately (reed contact position, teach-in
pushbutton status, unique 32-bit sensor ID, checksum). In addition a PRESENCE SIGNAL is
sent around every 12 minutes to announce the contact status even in case of no input signal
changes (sign of life).
Between the wake-up phases, the device is in sleep mode for minimum power consumption
(on average some nA only!).
1.4 Dimensions of Reed Contact Unit
Dimensions of Reed Contact Unit: ............................ base 110 x 19 mm x height 15 mm
Weight of Reed Contact Unit: ............................................................................... 18g
Material of housing: ........................................................................................ PC/ABS
Color of housings: ...................................................... signal white (similar to RAL 9003)
Figure 3: Top view
©EnOcean GmbH, A. Anders
Page 6 of 24
STM 250 User Manual V1.3
Figure 4: Side view
Figure 5: Front view
©EnOcean GmbH, A. Anders
Figure 6: Bottom view
Page 7 of 24
STM 250 User Manual V1.3
1.5 Dimensions of Magnet Unit
Dimensions of Magnet Unit: .................................. base 37 mm x 10 mm x height 5 mm
Weight of Magnet Unit: .......................................................................................... 2g
Material of housing: ........................................................................................ PC/ABS
Color of housing: ........................................................ signal white (similar to RAL 9003)
Figure 7: Magnet Unit
Figure 8: Top view
©EnOcean GmbH, A. Anders
Figure 9: Side view
Page 8 of 24
STM 250 User Manual V1.3
Loading...