Enocean Ptm 215ze User manual

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

Patent protected:

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

Observe precautions! Electrostatic sensitive devices!

PTM 215ZE 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

17 March 2022

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

REVISION HISTORY

The following major modifications and improvements have been made to this document:

Version Author Reviewer Date Major Changes

1.0 MKA MHö / MF 09.03.2022

Initial Release

Published by EnOcean GmbH, Kolpingring 18a, 82041 Oberhaching, Germany

www.enocean.com, info@enocean.com, phone +49 (89) 6734 6890

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

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.

Components of the modules 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.

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

TABLE OF CONTENT

1 General Description ....................................................................................... 5

1.1 Key Functionality ........................................................................................... 5

1.2 Technical Data .............................................................................................. 6

1.3 Physical Dimensions ...................................................................................... 6

1.4 Environmental Conditions ............................................................................... 6

1.5 Packaging Information ................................................................................... 6

1.6 Ordering Information ..................................................................................... 6

2 Functional Information ................................................................................... 7

2.1 Device Overview ........................................................................................... 7

2.2 Functional Principle ........................................................................................ 7

2.3 Block Diagram .............................................................................................. 8

2.4 User Interface ............................................................................................... 9

3 Radio Transmission ...................................................................................... 10

3.1 Radio Channel Parameters ............................................................................ 10

3.2 Telegram Structure ...................................................................................... 11

3.2.1 PHY Header ......................................................................................... 12

3.2.2 MAC Header ........................................................................................ 13

3.2.3 MAC Trailer ......................................................................................... 13

3.3 Payload Structure ........................................................................................ 14

3.3.1 Button Contact Encoding....................................................................... 15

4 Telegram Authentication .............................................................................. 16

4.1 Authentication Implementation ..................................................................... 17

5 Commissioning ............................................................................................ 18

5.1 Commissioning Mode Entry ........................................................................... 18

5.2 Commissioning Telegram Transmission .......................................................... 19

5.3 Commissioning Telegram Format ................................................................... 20

5.3.1 Commissioning Telegram Example ......................................................... 21

5.4 Radio Channel Adjustment ............................................................................ 22

5.4.1 Adjustment examples ........................................................................... 22

5.5 Determining The Correct Radio Channel ......................................................... 23

5.6 Radio Channel Storage And Return To Data Mode ............................................ 23

6 Device Integration ....................................................................................... 24

6.1 Using the NFC interface ................................................................................ 24

6.2 NFC interface functions ................................................................................ 25

6.3 NFC interface state machine ......................................................................... 25

6.3.1 IDLE state ........................................................................................... 26

6.3.2 READY 1 state ..................................................................................... 26

6.3.3 READY 2 state ..................................................................................... 26

6.3.4 ACTIVE state ....................................................................................... 26

6.3.5 Read command ................................................................................... 27

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

6.3.6 Write command ................................................................................... 27

6.3.7 Password authentication (PWD_AUTH) command ..................................... 28

7 Device Integration ....................................................................................... 29

7.1 Mechanical Interface Characteristics .............................................................. 29

7.2 Mechanical Interface Drawings ...................................................................... 29

7.3 Device Label ............................................................................................... 35

7.3.1.1 QR Code Format ............................................................................... 35

8 Application Information ................................................................................ 36

8.1 Transmission Range ..................................................................................... 36

9 Regulatory Information ................................................................................ 37

9.1 RED for the European Market ........................................................................ 37

9.2 FCC (United States) Certificate ...................................................................... 38

9.2.1 FCC (United States) Regulatory Statement .............................................. 39

9.3 ISED (former Industry Canada) Certificate ..................................................... 40

9.3.1 ISED (former Industry Canada) Regulatory Statement ............................. 41

9.3.1.1 English version ................................................................................. 41

9.3.1.2 French version .................................................................................. 42

10 Product history ............................................................................................ 43

11 References ................................................................................................. 43

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

1 General Description

1.1 Key Functionality

PTM 215ZE enables the realization of energy harvesting wireless switches for systems com-

municating based on the 2.4 GHz IEEE 802.15.4 radio standard including those supporting

the ZigBee Green Power standard.

PTM 215ZE integrates an NFC interface which can be used to configure device parameters

used for the radio telegram transmission.

PTM 215ZE is mechanically compatible with the established PTM 21x form factor enabling

quick integration into a wide range of designs. Key applications are wall-mounted or portable

switches either with up to two rockers or up to four push buttons.

PTM 215ZE pushbutton transmitters are self-powered (no batteries) and fully maintenance-

free. 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 energy transducer actuated by an energy bow located on the left and right of the

module. This energy bow which can be pushed from outside the module by an appropriate

pushbutton or switch rocker.

When the energy bow is pushed down or released, electrical energy is created and a 2.4GHz

radio telegram according to the ZigBee Green Power standard is transmitted. This radio tel-

egram transmits the operating status of all four contact nipples at the moment when the

energy bow was pushed down or released. PTM 215ZE telegrams are protected with an AES-

128 signature based on a device-unique private key.

Figure 1 below shows PTM 215ZE.

Figure 1 – PTM 215ZE Product Outline

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

1.2 Technical Data

Antenna

Integrated antenna

Max. radio transmit power (measured)

+6 dBm / 4 mW

Radio Standard ZigBee Green Power (IEEE 802.15.4)

Supported Radio Channels 2.4 GHz Channel 11 … 26 (Default: Channel 11)

Radio Channel Selection

User

selectable (Commissioning)

Device

Identification

Individual 32 Bit Device ID (factory programmed)

Telegram Authentication AES128 (CBC Mode) with Sequence Code

Power Supply Integrated Kinetic Energy Harvester

Button Inputs

Up to four buttons or two rockers

Configuration

Interface

NFC (ISO1443)

1.3 Physical Dimensions

Module

Dimensions

40.0 x 40.0 x 11.2 mm

Module Weight

20 g

1.4 Environmental Conditions

Operating Temperature -25°C ... 65°C

Storage Temperature -25°C ... 65°C

Humidity

0% to 95% r.h.

(non

condensing)

1.5 Packaging Information

Packaging Unit 100 units

Packaging Method Tray / Box (10 units per tray, 10 trays per box)

1.6 Ordering Information

Type Ordering Code Frequency

PTM 215ZE S3271-A215 2.4 GHz (IEEE 802.15.4)

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

2 Functional Information

2.1 Device Overview

The pushbutton transmitter module PTM 215ZE from EnOcean enables the implementation

of wireless switches and remote controls without batteries. Power is provided by a built-in

electro-dynamic power generator.

The outer appearance of PTM 215ZE is shown in Figure 2 below.

Figure 2 – Electro-dynamic powered pushbutton transmitter module PTM 215ZE

2.2 Functional Principle

PTM 215ZE devices contain an electro-dynamic energy transducer which is actuated by an

energy bow (1). This bow is pushed by an appropriate push button, switch rocker or a similar

construction mounted onto the device. An internal spring will release the energy bow as soon

as it is not pushed down anymore.

When the energy bow is pushed down, electrical energy is created and a ZigBee Green Power

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.

(2) Button contacts

for switch rocker

identification

(1) Energy bow

on both device sides

Rotation axis for

pushbuttons or

switch rocker

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

2.3 Block Diagram

Figure 3 – Block diagram of PTM 215ZE

Energy Bow / Power Generator

Converts the motion of the energy bow into electrical energy

Power Converter

Converts the energy of the power generator into a stable DC supply 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

Radio transmitter

Transmits the data in the form of a series of short ZigBee Green Power radio telegrams using

the integrated antenna

In addition, PTM 215ZE contains an integrated NFC interface according to ISO14443 that can

be used to configure device parameters.

Processor

Energy

Bow

Power

Converter

Data

DC Power

Pushed

Released

Processor

Radio

Transmitter

Button Contacts

Energy

Bow

Power

Converter

Data

DC Power

Pushed

Released

Antenna

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

2.4 User Interface

PTM 215ZE devices provide four button contacts. They are grouped into two channels (Chan-

nel A and Channel B) each containing two button contacts (State O and State I).

The state of all four button contacts (pressed or not pressed) is transmitted together with a

unique device identification (32 Bit ZigBee Green Power Device ID) whenever the energy bow

is pushed or released.

Figure 4 below shows the arrangement of the four button contacts and their designation.

Figure 4 – Button contact designation

CHANNEL

STATE

CHANNEL

STATE

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

3 Radio Transmission

PTM 215ZE transmits data telegrams according to IEEE 802.15.4 physical radio interface

using ZigBee Green Power data and commissioning telegrams.

3.1 Radio Channel Parameters

PTM 215ZE supports all sixteen IEEE 802.15.4 / ZigBee Green Power radio channels in the

2.4 GHz band (channels 11 … 26 according to IEEE 802.15.4 notation) which can be selected

as described above.

Table 1 below shows the correspondence between channel number and channel frequency

(in MHz).

Table 1 - IEEE 802.15.4 Radio Channels and Frequencies (in MHz)

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

3.2 Telegram Structure

PTM 215ZE transmits radio telegrams in the 2.4 GHz band according to the IEEE 802.15.4

frame structure using a ZigBee Green Power compliant payload.

Note that the byte order used by these standards is little endian. This means that for multi-

byte structures (such as 2 byte, 4 byte or 8 byte fields) the least significant byte (LSB) is

transmitted first.

The frame structure used by PTM 215ZE consists of the following four main parts:

 PHY Header

The PHY header indicates to the receiver the start of a transmission and provides infor-

mation about the length of the transmission.

It contains the following fields:

- Preamble

Pre-defined sequence (4 byte, value 0x00000000) used to adjust the receiver

to the transmission of the sender

- Start of frame

Pre-defined symbol (1 byte, value 0xA7) identifying the start of the actual data

frame

- Length of frame

1 byte indicating the combined length of all following fields

 MAC Header

The MAC header provides detailed information about the frame.

It contains the following fields:

- Frame control field

2 bytes (always 0x0801) which identify frame type, protocol version, addressing

and security mode

- Sequence number

1 byte sequential number to identify the order of transmitted frames

- Address

PAN ID and address of source (if present) and destination of the telegram

PTM 215ZE does not use source address and source PAN ID

 MAC Payload

The MAC payload is based on the ZigBee Green Power standard. It contains telegram

control, device ID, telegram data and telegram security fields.

 MAC Trailer

The MAC Trailer contains the Frame Check Sum (FCS) field used to verify the integrity of

the telegram data.

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

Figure 5 below summarizes the IEEE 802.15.4 frame structure.

Figure 5 – IEEE 802.15.4 Frame Structure

The content of these fields is described in more detail below.

3.2.1 PHY Header

The IEEE 802.15.4 PHY header consists of the following fields:

 Preamble

 Start of Frame

 Length of Frame fields

The content of the Preamble and Start of Frame fields is fixed for all telegram types supported

by PTM 215ZE as follows:

 Preamble = 0x00000000

 Start of Frame = 0xA7

The content of the Length of Frame field differs depending on the telegram type as follows:

 Commissioning telegram

Length= 42 bytes (0x2A)

 Data telegram

Length = 24 bytes (0x18)

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

3.2.2 MAC Header

The IEEE 802.15.4 MAC Header contains the following fields:

 Frame Control Field (2 byte)

The Frame Control Field is set to 0x0801 in all PTM 215ZE telegrams in order to identify

them as data telegrams with short addresses based on version IEEE 802.15.4-2003

 Sequence Number (1 byte)

The Sequence Number is an incremental number used to identify the order of telegrams

 Address Field (4 byte in PTM 215ZE implementation)

The Address Field is set to 0xFFFFFFFF to identify PTM 215ZE telegrams as broadcast tel-

egrams using short Destination Address (16 Bit) together with the Destination PAN ID (16

Bit). Source address and Source PAN ID are not present in PTM 215ZE MAC Header.

3.2.3 MAC Trailer

The MAC Trailer only contains the Frame Check Sum (FCS) field.

Its length is 2 byte and it is calculated as Cyclic Redundancy Check (CRC16) over the entire

MAC payload including the Length of Frame field of the PHY Header using the following poly-

nomial: x16 + x12 + x5 + 1

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

3.3 Payload Structure

The MAC Payload is encoded to be compatible with the zigbee Green Power protocol. Figure

6 below shows the MAC Payload structure for data telegrams.

Figure 6 – MAC Payload structure for data telegrams

The following fields are used for the MAC Payload of data telegrams:

 Telegram Control (2 byte)

The Telegram Control field is set to 0x308C to identify a secure telegram with device-unique

key

 Source ID (4 byte)

The Source ID field contains a 4 byte ID uniquely identifying each PTM 215ZE device

 Sequence Counter (4 byte)

The Sequence Counter field contains an always incrementing counter.

Security processing is based on the combination of the Command and Sequence Counter

in order to prevent replay attacks (sending the same telegram again)

 Command (1 byte)

The Command field is a one byte field which identifies the state of the PTM 215ZE contacts.

For the encoding please refer to Table 2 below.

 Telegram Signature (4 byte)

The Telegram Signature field is used to validate the telegram authenticity. The telegram

signature is calculated based on the telegram payload using AES128 (CBC mode). For

details, see chapter 4

In addition to data telegrams, PTM 215ZE can also transmit commissioning telegrams as

described in chapter 5.3

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

3.3.1 Button Contact Encoding

Table 2 below shows the supported single and dual button contact actions of PTM 215ZE

together with the encoding used for the transmission.

In this table, the meaning of “0” and “1” is the following for press and release events:

 “0”

Button is not pressed upon push

Button was not pressed before release

 “1”

Button is pressed upon push

Button was pressed before release

B0 B1 Energy Bar Command

0 0 0 0 Press 0x10

0 0 0 0 Release 0x11

0 0 0 1 Press 0x12

0 0 0 1 Release 0x13

0 0 1 0 Press 0x14

0 0 1 0 Release 0x15

0 1 0 0 Press 0x18

0 1 0 0 Release 0x19

1 0 0 0 Press 0x22

1 0 0 0 Release 0x23

0 0 1 1 Press 0x16

0 0 1 1 Release 0x17

0 1 0 1 Press 0x1A

0 1 0 1 Release 0x1B

0 1 1 0 Press 0x1C

0 1 1 0 Release 0x1D

1 0 0 1 Press 0x1E

1 0 0 1 Release 0x1F

1 0 1 0 Press 0x62

1 0 1 0 Release 0x63

1 1 0 0 Press 0x64

1 1 0 0 Release 0x65

Table 2 - PTM 215ZE button contact status encoding

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

4 Telegram Authentication

PTM 215ZE implements telegram authentication for data telegrams to ensure that only tele-

grams from senders using a previously exchanged security key will be accepted. Authenti-

cation relies on a 32 bit telegram signature which is calculated as shown in Figure 7 below

and exchanged as part of the radio telegram.

Figure 7 – Telegram authentication flow

Sequence counter, source address and the remaining telegram data together form the in-

put data for the signature algorithm. This algorithm uses AES128 encryption based on the

device-unique random security key to generate a 32 bit signature which will be transmitted

as part of the radio telegram.

The signature is therefore dependent both on the current value of the sequence counter,

the device source address and the telegram payload. Changing any of these three parame-

ters will therefore result in a different signature.

The receiver performs the same signature calculation based on sequence counter, source

address and the remaining telegram data of the received telegram using the security key it

received from PTM 215ZE during commissioning.

The receiver then compares the signature reported as part of the telegram with the signa-

ture it has calculated. If these two signatures match then the following statements are

true:

 Sender (PTM 215ZE) and receiver use the same security key

 The message content (address, sequence counter, data) has not been modified

In order to avoid message replay (capture and retransmission of a valid message), it is re-

quired that the receiver tracks the value of the sequence counter used by PTM 215ZE and

only accepts messages with higher sequence counter values (i.e. not accepts equal or lower

sequence counter values for subsequent telegrams).

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

4.1 Authentication Implementation

PTM 215ZE implements telegram authentication according to the ZigBee Green Power spec-

ification. It uses AES128 in CCM (Counter with CBC-MAC) mode as described in IETF

RFC3610. At the time of writing, the RFC3610 standard could be found here:

https://www.ietf.org/rfc/rfc3610.txt

The 13 Byte CCM Nonce (number used once – unique) initialization value is constructed as

concatenation of 4 byte Device ID, 4 byte Device ID again, 4 byte Sequence Counter and 1

status byte of value 0x05.

Note that both Device ID and Sequence Counter use little endian format (least significant

byte first).

Figure 8 below shows the structure of the AES128 Nonce.

Figure 8 – AES128 Nonce structure

The AES128 Nonce and the 128 bit device-unique security key are then used to calculate a

32 bit signature of the authenticated telegram payload shown in Figure 9 below.

Figure 9 – Authenticated payload

The calculated 32 bit signature is then appended to the data telegram payload as shown in

chapter 3.3.

The security key required for the telegram authentication can be obtained in two ways:

 Product DMC code

Each PTM 215ZE device contains a product label with a DMC code that identifies the Source

ID and the Private Security Key used by this device, see below.

 Commissioning telegram

The security key is transmitted as part of the commissioning telegram, see chapter 5.3

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

5 Commissioning

Commissioning is used to commission (teach-in, learn in) PTM 215ZE into a specific re-

ceiver or network. To do so, PTM 215ZE provides two key functions:

 Transmission of a commissioning telegram in order to learn-in PTM 215ZE into a network

 Radio channel selection in order to set the radio channel of PTM 215ZE to that used by the

network

These functions are described subsequently in more detail.

5.1 Commissioning Mode Entry

Commissioning mode is entered using a special button contact sequence. This is illustrated

in Figure 10 below.

Figure 10 – Button sequence for commissioning mode

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

To enter commissioning mode, start by selecting one button contact of PTM 215ZE. Any

contact of PTM 215ZE (A0, A1, B0, B1) can be used. This contact is referred to as ButtonX in

Figure 10 above.

Next, execute the following long-short-long sequence:

1. Press and hold the selected button contact together with the energy bar for more

than 7 seconds before releasing it

2. Press the selected button contact together with the energy bar quickly (hold for less

than 2 seconds)

3. Press and hold the selected button contact together with the energy bar again for

more than 7 seconds before releasing it

Upon detection of this sequence, PTM 215ZE will enter commissioning mode and transmit a

commissioning telegram on the current radio channel.

Sometimes the user might be unsure if PTM 215ZE is operating in normal mode or in com-

missioning mode and if part of the entry sequence into commissioning mode has already

been executed.

PTM 215ZE can always be set into a defined state (normal mode) by shortly (< 7s) pressing

two different buttons one after another. After that, PTM 215ZE will operate in data mode and

the full sequence for commissioning mode entry (long-sort-long) has to be executed to enter

commissioning mode.

5.2 Commissioning Telegram Transmission

PTM 215ZE will transmit a commissioning telegram on the current radio channel immediately

upon entering commissioning mode. This allows teach-in into additional devices without

changing the currently used radio channel.

The default radio channel used by PTM 215ZE is channel 11 (see chapter 3). It can be sub-

sequently adjusted as described in the following chapter.

Whenever a new radio channel is selected, PTM 215ZE will transmit a commissioning tele-

gram on the new radio channel. This enables the receiver to provide feedback to the user to

indicate when PTM 215ZE has reached the correct radio channel (i.e. when the receiver re-

ceives a commissioning telegram from PTM 215ZE on the radio channel the receiver is using).

See chapter 5.5 for a discussion of feedback mechanisms.

The format of PTM 215ZE radio telegrams including commissioning telegrams is described

below.

USER MANUAL

PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module

5.3 Commissioning Telegram Format

Figure 11 below shows the MAC payload structure for commissioning telegrams.

Figure 11 – MAC Payload structure for commissioning telegrams

The following fields are used for commissioning telegrams:

 Telegram Control (1 byte)

The Telegram Control field is set to 0x0C to identify a standard telegram (secure commu-

nication will be established based on the commissioning telegram)

 Source ID (4 bytes)

The Source ID field contains a 4 byte ID uniquely identifying each PTM 215ZE device

 Command (1 byte)

The Command field is set to 0xE0 to identify this command as commissioning command

 Device Type (1 byte)

The Device Type field is set to 0x02 to identify PTM 215ZE as ON / OFF switch

 Device Options (2 byte)

The Device Options field is set to 0xF281 to identify the device as PTM 215ZE communi-

cating securely using the AES128 (CBC mode) algorithm and a 4 byte sequence counter

to generate a 4 byte signature

 Encrypted Device-unique Security Key (16 bytes)

Each PTM 215ZE contains a random, device-specific security key which is generated as

part of the production flow. During commissioning, this key is transmitted in encrypted

form as specified by the zigbee Green Power specification.

 Security Key Validation (4 bytes)

In order to ensure correct reception, an additional 4 byte validation value is provided.

 Sequence Counter (4 bytes)

The Sequence Counter is an always incrementing counter which is used as part of the

security processing to avoid replay attacks (sending the same telegram again).

Receiving devices shall only accept data telegrams with sequence counter values higher

than that of the last received telegram; therefore the current value needs to be commu-

nicated during commissioning.

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