WO98/36395, DE 100 25 561, DE 101 50 128,
WO 2004/051591, DE 103 01 678 A1, DE 10309334,
WO 04/109236, WO 05/096482, WO 02/095707,
US 6,747,573, US 7,019,241
This information describes the type of component and shall not be considered as assured
characteristics. No responsibility is assumed for possible omissions or inaccuracies. Cir cuitry
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
modules, not for the described applications, processes and circuits.
EnOcean does not assume responsibility for use of modules described and limits its liability
to the replacement of modules determined to be defective due to workmanship. Devices or
systems containing RF components must meet the essential requirements of the local legal
authorities.
The modules 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.
Component s of th e m odules ar e cons i dered an d shoul d b e di s posed of as ha zar dous wa ste .
Local gov ernment regula tions are to be obs erved.
Packing: Please use th e recycling operators known to you.
PTM 215B enables the realization of energy harvesting wireless switches for EnOcean systems communicating based on the 2.4 GHz B LE communication standard.
PTM 215B is mechanically compatible with the established PTM 21x form factor enabling
quick in t egrati on int o a wide range of designs. Ke y appl ications are wall -mount ed or por t able switches either with up to two rockers or up to four push buttons.
PTM 215B pushbutton transmitters are self-powered (no batteries) and fully maintenancefree. They can therefore be used in all environments including locations that are difficult to
reach or within hermetically sealed housings. The required energy is generated by an electro-dynamic en ergy transducer actuated by an energy bow located on the left and right of
the m odule. This energy bow which can be pushed from outs ide the mod ule by an appropriate pushbutton or switch rocker.
When the energy bow is pushed down or released, electrical energy is cre ated and a radio
telegr am accordin g to the 2.4 GHz BLE standard is transmitted. This radio telegram transmits the operating status of all four contact nipples at the moment when the energy bow
was pushed down or released.
PTM 215B radio telegrams are protected with AES-128 security based on a device-unique
private key.
The pushbutton transmitter module PTM 215B from EnOcean enables the implementation of
wireles s remote contr ols without batteries. P ower is provided by a built-in electro-dynamic
power generator. PTM 215B device transmits data based on the 2.4GHz BLE standard.
The outer appearance of PTM 215B is s hown on the pictur e be low.
PTM 215B devices contain an electro-dynamic energy transducer which is act uat ed by an
energy bow (1). This bow is pushed by an appropriate push button, switch rocker or a similar cons tru ction m ounte d ont o the devic e. An inte rnal s pring will re leas e th e ener gy b ow as
soon as it is not pushed down anymore.
When the energy bow is pushed down, electrical energy is created and an BLE radio telegram is transmitted which identifies the status (pressed or not pressed) of the four button
contacts (2). Releasing the energy bow similarly generates energy which is used to transmit a different radio telegram.
It is therefore possible to distinguish between radio telegrams sent when the energy bar
was pushed and radio telegrams sent when the energy bar was released.
By identifying these different telegrams types and measuring the time between pushing
and releasing of the energy bar, it is possible to distinguish between “Long” and “Short”
button contact presses. This enables simple implementation of applications such as dimming control or blinds control including slat action.
Converts the motion of the energy bow into electr ical energy
Power Converter
Converts the e nergy of the p ower gen erator into a sta ble DC s upply voltage for the device
electronics
Processor
Determines the status of the button contacts and the energy bow, encodes this status into
a data word, generates the proper radio telegram structure and sends it to the radio
transmitter
RF transmitter
Transmits the data in the form of a series of short BLE 2.4 GHz radio telegrams using the
integrated antenna
NFC interface
Allows reading and writing certain product parameters using an NFC compliant reader /
writer supporting NFC Forum Type 2 tags (as specified by ISO/IEC 14443 P art 2 and 3 ).
PTM 215B devices provide four button contacts. They are grouped into two channels
(Channel A and Channel B) each containing two button contacts (S tate O and State I) .
The sta te of all four button contacts (pressed or not pressed) is transmitted together with a
unique device identification (48 Bit device ID) whenever the energy bow is pushed or released.
Figure 4 below shows the arrangement of the four button contacts and their designation:
PTM 215B transmits advertising telegrams within the 2.4 GHz radio frequency band
(2402M Hz … 24 8 2M Hz ) using the BLE advertising frame format.
By def ault, PT M 215B w ill us e the three BLE advertisin g channels (Channel 37, 38 and 39)
defined for transmission.
Table 1 below summarizes the radio channel assignment within the BLE standard.
Table 1 – Radio channel paramet ers
The transmission of a radio telegram on all three advertising chan nel s is cal led an Advertising Event. In order to further increase communication reliability, more than one Advertising
Event might be transmitted for an individual radio telegram.
2.5.1 PTM 215B radio transmission sequence
PTM 215B transmits radio telegrams using so-called Advertising Events.
An advertising event is defined as the transmission of the same radio telegram on all se-
lected radio channels (by default this would be on BLE Channel 37, 38 and 39) one after
another with mini mum delay in between.
For reliability reasons, PTM 215B will send several (mi nimu m t wo, m axi mum thr ee) advertising events for each button input. The resulting transmission sequence is shown in Figure
5 below.
Figure 6 below shows the button action encoding used by PTM 215B.
In PTM 215B, the type of action (Press Action or Release Action) is indicated by B it 0 (Ener-
gy Bar). If a butt on contact has been actuated during Press Action or Release Action then
this is indicated by the accordi n g status bit set to ‘1’.
Note that all contacts that were pressed during Press Action will be released during Release
Action . The case of cont inuing to h old one (or sev eral) button contacts during Release Action is me chanically not poss ible.
Commissioning is the process by which PTM 215B is learned into a receiver (actuator, controller, gateway, etc.).
The follow ing two tasks are required in this process:
n Device identification
The receiver needs to know how to uniquely identify this specific PTM 215B device. This
is achieved by using a unique 48 Bit ID (Source Address) for each PTM 215B device as
described in chapter 2.9.4. In addition, up to 4 b yte of Optional Data can be co nfigured
as described in chapter 2.11.4.1
n Security parame ter exchange
The receiver needs to be able to authenticate radio telegrams from PTM 2 15B in order to
ensure that they originate from this specific device and have not been modified as described in chapte r 2.10. This is achieved by exchanging t he 128 Bit random security key
used by PTM 215B to authenticate its radio telegrams.
PTM 215B pr ovides the following option s f or these tasks:
n NFC-based commissioning
The PTM 215B parameters are read by a suitable commissioning tool (e.g. NFC
smartphone) which is alr eady part of the network into which PTM 215B will be com missioned. The commissioning tool then communicates these parameters to the intended
receiver of PTM 215B radio telegrams. NFC-based commissioning is described in chapter
2.11
n Radio-based commissioning
PTM 215B can communicate i ts parameters via special radio telegrams (commissioning
telegrams) to the intended receiver. To do so, PTM 215B can be temporarily placed into
radio-based commissioning mode as described in chapter 2.8.2
n Camera-based commissioning
Each PTM 215 B m odu le contains an automatically readable Data Mat rix Code (DMC)
which identi fies its ID and its security key. This DMC can be read by a by a suitable
commissioning tool (e.g. smartphone) which is already part of the network into which
PTM 215B will be commissioned. The commis sioning tool then c ommunicates these parameters to the intended receiver of PTM 215B radio telegrams. The DMC structure is
described in chapter 3.3.1
Data mo de is used to transmit data telegrams reporting the status of PTM 215B button
inputs
n Radio-based commis sioning mode
Radio-based commis sioning mode is used to commission (teach-in) PTM 21 5B into a
specific receiver or ne twork by means of a specific commissioning telegram.
This is an alternative for scenarios where NFC commissioning cannot be used.
2.8.1 Data mode
Data mode i s the st andard mode of op eration. In this mod e, PTM 215B will transmit radio
telegr a ms id entifying the status of its four button contacts and the energy bar.
PTM 215B uses the following sequence to identify and transmit button contact status:
1. Determine direction of the energy bar movement (Push Action or Release Action)
2. Read input status of all button contacts
3. Calculate data payload
4. Calculate security signature
5. Format BLE radio telegram
6. Transmit BLE radio telegram as sequence of Ad v e r t ising Events