Dolphin Tcm 515 User manual

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY 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!

TCM 515 EnOcean Transceiver Gateway Module

31.07.2018

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

REVISION HISTORY

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

Version

Author

Reviewer

Date

Major Changes

1.0

MKA

MK, CB

12.05.2017

First public release

1.1

MKA

22.05.2017

Added detailed antenna information

1.2

MKA

MH, MK

22.06.2017

Added receiver class due to RED requirement

1.3

MKA

08.08.2017

Added FCC grant and regulatory information

for FCC and ISED; Added maximum input

power

1.4

MKA

31.08.2017

Added Tape & Reel specification

1.5

MKA

19.09.2017

Added detailed description of filtering func-

tionality

1.6

MKA

25.10.2017

Added maximum number of filters

1.7

MKA

10.01.2018

Extensive update for production version.

Added detailed description of telegram pro-

cessing, security operations and noise filter-

ing.

1.8

MKA

30.01.2018

Added product revision history

Added maximum input power and RSSI accu-

racy. Added current during start-up.

1.9

MKA

30.04.2018

Added DA-7 to product history

1.10

MKA

31.07.2018

Added DB-8 to product history, extended de-

scription of ESP3 interface, telegram filtering

and BaseID functionality

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 specifica-

tions, 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

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

TABLE OF CONTENT

1General description........................................................................................ 6

1.1 Basic functionality ......................................................................................... 6

1.2 Technical data...............................................................................................7

1.3 Physical dimensions....................................................................................... 7

1.4 Environmental conditions ...............................................................................8

1.5 Packaging information.................................................................................... 8

1.6 Ordering information......................................................................................8

2Functional information ...................................................................................9

2.1 High level functionality...................................................................................9

2.2 Functional modes ........................................................................................ 10

2.2.1 Telegram reception .............................................................................. 11

2.2.2 Telegram transmission ......................................................................... 11

2.2.3 Telegram repeating.............................................................................. 11

2.2.4 Low power sleep mode ......................................................................... 11

2.3 Device Interface.......................................................................................... 12

2.3.1 Pin-out ............................................................................................... 12

2.3.2 Power supply....................................................................................... 13

2.3.3 Antenna ............................................................................................. 13

2.3.4 UART interface .................................................................................... 13

2.3.5 Reset ................................................................................................. 14

2.3.6 TCM 500 programming signals (SWD, SWCLK, PROG) .............................. 14

3ESP3 interface ............................................................................................ 15

3.1 ESP3 physical interface ................................................................................ 15

3.2 ESP3 Packet Structure ................................................................................. 16

3.3 Supported ESP3 commands .......................................................................... 17

3.4 Persistent versus not persistent configuration settings ..................................... 18

4Telegram transmission ................................................................................. 19

4.1 Transmission flow........................................................................................ 19

4.2 Subtelegram Timing .................................................................................... 20

4.3 TX Maturity Time......................................................................................... 21

4.4 Address types ............................................................................................. 21

4.4.1 EURID ................................................................................................ 22

4.4.2 Base ID .............................................................................................. 22

4.4.3 Broadcast ID....................................................................................... 23

4.5 Built-in Repeater ......................................................................................... 23

4.6 Duty Cycle Limit.......................................................................................... 24

5Telegram reception flow ............................................................................... 25

5.1 RX maturity time......................................................................................... 26

5.2 Telegram filtering ........................................................................................ 27

5.2.1 Filter types ......................................................................................... 27

5.2.2 Filter logic........................................................................................... 28

5.2.3 Configuration of telegram filtering.......................................................... 29

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

5.2.4 Forwarding (Receiver) filter examples .................................................... 32

5.2.5 Repeater filter examples....................................................................... 33

6Security functionality ................................................................................... 34

6.1 Basic concepts ............................................................................................ 34

6.1.1 Telegram encryption ............................................................................ 35

6.1.2 Telegram authentication ....................................................................... 35

6.1.3 Dynamic security key modification ......................................................... 37

6.2 TCM 515 implementation specifics ................................................................. 38

6.2.1 High level architecture.......................................................................... 38

6.2.2 High level execution flow ...................................................................... 39

6.2.3 Secure link table.................................................................................. 40

6.2.3.1 Secure link table parameters .............................................................. 41

6.2.4 Secure EEP support.............................................................................. 42

6.3 Supported security features.......................................................................... 43

6.3.1 Telegram encryption and decryption....................................................... 43

6.3.2 Telegram authentication ....................................................................... 44

6.3.3 Rolling code support............................................................................. 44

6.3.3.1 Explicit versus implicit rolling code ...................................................... 45

6.4 Teach-in of secure devices............................................................................ 46

6.4.1 Teach-in of secure devices with teach-in telegram ................................... 47

6.4.1.1 Handling of teach-in telegram when not in teach-in mode ...................... 48

6.4.2 Teach-in of secure devices using ESP3 ................................................... 48

6.5 Reporting of security-related events .............................................................. 49

7Remote Management ................................................................................... 50

8Device Integration....................................................................................... 50

8.1 Recommended PCB Footprint ........................................................................ 50

8.2 Device outline ............................................................................................. 51

8.3 Soldering information................................................................................... 52

8.4 Packaging information.................................................................................. 53

8.5 Layout recommendations ............................................................................. 54

8.6 Power supply requirements........................................................................... 54

8.7 Low noise design considerations.................................................................... 55

8.8 Suggested Reset circuit................................................................................ 56

8.9 Debug interface........................................................................................... 57

9Antenna options .......................................................................................... 58

9.1 Antenna options for 868 MHz (European Union) .............................................. 58

9.1.1 Whip antenna ......................................................................................... 59

9.2 Antenna options for 902 MHz (US / Canada) ................................................... 60

9.2.1 Whip antenna ......................................................................................... 60

9.2.2 Helical antenna ....................................................................................... 60

9.2.3 Chip antenna (Supplier: Mitsubishi Material, Type AM11DP-ST01T)................ 61

9.2.4 Dipole antenna (ANT-916-CW-HWR-RPS)................................................ 62

10 Application information ................................................................................ 63

10.1 Transmission range ..................................................................................... 63

10.2 Maximum input power.................................................................................. 64

10.3 RSSI reporting ............................................................................................ 64

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

11 Regulatory information................................................................................. 65

11.1 RED (European Union) ............................................................................ 65

11.1.1 RED Attestation of Conformity for TCM 515 ............................................. 66

11.2 FCC (United States) ................................................................................ 67

11.2.1 FCC Grant Of Equipment Authorization ................................................... 67

11.2.2 FCC Usage Conditions .......................................................................... 68

11.2.3 OEM Requirements .............................................................................. 69

11.2.4 Module Activation ................................................................................ 70

11.3 ISED (former Industry Canada) Certification ................................................... 71

11.3.1 ISED Technical Acceptance Certificate .................................................... 71

11.3.2 ISED Usage Conditions ......................................................................... 72

11.4 Repeater Function (FCC/IC) .......................................................................... 73

12 Product history............................................................................................ 74

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

1General description

1.1 Basic functionality

TCM515 is a transceiver module family consisting of the following products:

TCM 515

868.3 MHz ASK, EnOcean Radio Protocol version 1, lead market Europe

TCM 515U

902.875 MHz FSK, EnOcean Radio Protocol version 2, lead market US

The term “TCM 515” in this document refers to all members of the TCM 515 family unless

noted differently.

TCM 515 products are limited to OEM installation ONLY.

TCM 515 enables the realization of line-powered actuators, controllers and gateways. It

provides a transparent radio link between EnOcean radio devices and an external host con-

nected via UART interface using the standardized EnOcean Serial Protocol V3 (ESP3) com-

munication protocol.

TCM 515 receives and transmits radio telegrams based on a 50 Ohm or whip antenna con-

nected to the host PCB. It forwards received radio telegrams to an external host processor

or host PC via the ESP3 interface. Messages received from an external host via the ESP3

interface will be transmitted by TCM 515 as EnOcean radio telegrams according to the cho-

sen frequency.

TCM 515 is implemented as 31 pin reflow-solderable module with optimized form factor for

size constrained applications. It is not pin compatible with existing TCM 310 products.

Figure 1 below shows TCM 515.

Figure 1 –TCM 515 outline

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

1.2 Technical data

Antenna

50 Ohm whip antenna (connected at host board)

Supported Radio Frequencies

TCM 515: 868.3 MHz ASK

TCM 515U: 902.875 MHz FSK

Data Rate

125 kbps

Receiver Sensitivity (1)

TCM 515: 868.3 MHz ASK: -93 dBm

TCM 515U: 902.875 MHz FSK: -98 dBm

Maximum Input Power (1)

-23 dBm

Receiver Blocking Performance

Class 2 according to EN 300 220-1

Radiated RF Immunity

3 V / m according to EN 301 489-3

Transmit Power

TCM 515: 868.3 MHz ASK: +10 dBm

TCM 515U: 902.875 MHz FSK: +1 dBm

Supply Voltage (typ)

2.0 V … 3.6 V

Supply Current (at 2.0V)

25 mA

Supply Current Sleep Mode (at 2.0V / 25°C)

0.05 mA

Power-up to Ready State Timing (2)

50 ms

Ready State to RX State Delay (2)

200 ms (adjustable via ESP3)

Supply Current between Power-up and RX

12 mA

TX to RX switching time (3)

< 1 ms

Serial Host Interface

UART according to ESP3 Standard (TURBO option)

Note 1: Sensitivity and Maximum Input Power figures are based on 0.1% telegram error rate for the combination

of 3 received sub-telegrams measured at 25°C

Note 2: TCM 515 requires approximately 50 ms for start-up after power up. After completion of its internal start-

up, it waits for the selected delay period before starting RX mode to allow for power supply stabilization. The delay

period is adjustable via ESP3 command.

Note 3: TX to RX switch over time is measured from the transmission of the last bit (end of frame) of a radio

frame until the receiver is ready to receive the first bit (preamble) of a radio frame

1.3 Physical dimensions

Module Dimensions

19.0 mm x 14.7 mm x 3.0 mm (all +- 0.3 mm)

Module Weight

1 g

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

1.4 Environmental conditions

Operating Temperature

-40°C ... 85°C

Storage Temperature

-40°C ... 85°C

Humidity

0% to 95% r.h. (non-condensing)

1.5 Packaging information

Packaging Unit / Method 250 units / Tape and reel

1.6 Ordering information

Type

Ordering Code

TCM 515

TCM 515U

S3003-K515

S3053-K515

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2Functional information

2.1 High level functionality

TCM 515 is a fully integrated radio transceiver family which enables communication with

other devices implementing the EnOcean Radio Protocol (ERP).

TCM 515 is used to exchange (send and / or receive) radio telegrams with external sensors,

switches or actuators.

TCM 515 is connected to an external host which for instance could be a microprocessor, a

controller or a gateway.

Figure 2 below shows the integration of TCM 515 into a typical system environment.

Figure 2 –TCM 515 system environment

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2.2 Functional modes

TCM 515 implements the following functional modes:

Telegram Reception

Telegram Transmission

Low Power Sleep

The transition between these functional modes is shown in Figure 3 below

Figure 3 –TCM 515 functional modes

The following chapters describe these functional modes in more detail.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2.2.1 Telegram reception

In receive mode, TCM 515 processes received radio telegrams and verifies correct frame

structure and check sum.

Received telegrams can be filtered according to a filter list that can be setup via dedicated

ESP3 commands (see chapter 3 for the list of supported ESP3 commands).

For each received telegram, TCM 515 will check if the source address (sender of the tele-

gram) is setup in its inbound secure link table. If that is the case then TCM 515 will auto-

matically apply the specified security processing (authentication, decryption) specified by

corresponding inbound secure link table entry.

Processed radio telegrams will then be forwarded to the external host via the ESP3 inter-

face. See chapter 4 for a detailed description of the receiver functionality.

2.2.2 Telegram transmission

In transmit mode, TCM 515 receives radio telegrams for transmission from the external

host via its ESP3 interface.

TCM 515 will check if the destination address (intended receiver of the telegram) is setup in

the outbound secure link table. If that is the case then TCM 515 will automatically apply the

security processing specified by the corresponding outbound secure link table entry.

TCM 515 will then properly format the radio telegram frame and transmit the telegram as a

series of redundant telegrams. See chapter 4 for a detailed description of the transmission

functionality.

2.2.3 Telegram repeating

TCM 515 can act as repeater for all or selected radio telegrams. The repeating functionality

is configured via ESP3 interface.

If TCM 515 is configured to act as repeater and it receives a radio telegram that it has to

repeat then TCM 515 will automatically transition from receive to transmit state to re-

transmit (repeat) this telegram. After successful transmission, it will automatically transi-

tion back to receive mode.

See chapter 4.5 for a description of the repeater functionality.

2.2.4 Low power sleep mode

TCM 515 can be set into a low power sleep mode for a defined period of time by means of

an ESP3 command. After expiry of the requested sleep period, TCM 515 will automatically

wake-up and transition back to receive mode.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2.3 Device Interface

TCM 515 implements a 31 pin reflow-solderable interface. Solder mask data is available on

request from EnOcean.

2.3.1 Pin-out

The pin assignment (as seen from the top of the device) is shown in Figure 4 below. Solder

mask and mechanical data is available from EnOcean.

Figure 4 –TCM 515 device interface

Table 1 below summarizes the signal assignment.

NAME

GND

RF_50 (50Ω antenna)

nRST (Reset, active low)

GND

SWCLK (Debug, only TCM 500 variant)

GND

SWDIO (Debug, only TCM 500 variant)

PROG (SW Update, only TCM 500 variant)

GND

UART_RX (Input)

nTURBO (UART speed, active low)

UART_TX (Output)

VDD

Table 1 - TCM 515 pin assignment

Signals marked with “NC” are reserved for production test and future device variants and

must not be connected in the design.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2.3.2 Power supply

TCM 515 is supplied by the VDD and GND Pins and supports a supply voltage range from

2.0V to 3.6V. For best radio performance it is very important to minimize noise on the sup-

ply voltage lines. Please see chapter 8.4.

2.3.3 Antenna

TCM 515 receives and transmits data based on a 50Ω whip antenna connected to its RF_50

input (Pin 2). Please see chapter 9.

2.3.4 UART interface

TCM 515 communicates with the external host using the standard ESP3 serial (UART) inter-

face based on the signals UART_TX (Pin 21, direction from TCM 515 to external host) and

UART_RX (Pin 20, direction from external host to TCM 515).

The default interface speed of the ESP3 interface is 57600 bit per second and data is

transmitted using 8 data bits, 1 STOP bit and no parity (8N1).

It is possible to select faster communication speeds during operation using the ESP3

CO_SET_BAUDRATE command (see chapter 3). The following interface speeds are support-

ed by TCM 515:

57600 bit per second

460800 bit per second

Additionally, it is possible to change the default ESP3 interface speed at power up from

57.600 Bit per second to 460.800 Bit per second by connecting the nTURBO input (Pin 31,

active low) to Ground.

Subsequent modification of the interface speed during operation using the

CO_SET_BAUDRATE command is always possible irrespective of the state of the TURBO

input pin. Care should be taken not to select a UART interface speed which cannot be sup-

ported by the connected host processor as this would prevent subsequent communication.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

2.3.5 Reset

TCM 515 can be reset by pulling the nRST pin (Pin 24, active low) to Ground. Please see

chapter 8.8 for reset circuit recommendations.

2.3.6 TCM 500 programming signals (SWD, SWCLK, PROG)

TCM 500 is a user-programmable version of TCM 515 enabling users to implement simple

applications such as relays, actuators or controllers directly on the module without the need

for an external microcontroller.

For users wishing to reuse the same HW design both for TCM 515 and TCM 500 designs,

the following programming pins should be accessible:

Debug interface (Pin 25 –SWCLK, Pin 26 –SWDIO)

Firmware update enable (Pin 27 - PROG)

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

3ESP3 interface

TCM 515 provides an external interface according to the EnOcean Serial Protocol, version 3

(ESP3).

This interface is used both to exchange telegrams and command / status messages with an

external host system (e.g. microcontroller or PC) and EnOcean gateway transceiver mod-

ules.

The information in the subsequent chapters is provided as an introduction for information

purposes. For detailed information, please refer to the ESP3 specification:

https://www.enocean.com/esp

3.1 ESP3 physical interface

The physical interface used by ESP3 for communication between host system and an

EnOcean Gateway Controller is a 3-wire full duplex UART / RS-232 connection (RX, TX,

GND).

The standard UART baud rate is 57600 baud per second. TCM 515 supports a higher baud

rate of 460800 baud per second which can be selected using the command

CO_SET_BAUDRATE.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

3.2 ESP3 Packet Structure

ESP3 is a point-to-point (one to one) protocol based on a packet data structure.

Figure 5 below illustrates the ESP3 packet structure.

Figure 5 –ESP3 Packet Structure

Each ESP3 packet contains the following fields:

Header

Data

Optional Data.

In addition to those fields, the Sync Byte (0x55) identifies the start of the packet while sep-

arate CRC8 for Header and Data (incl. Optional Data) are used to verify data integrity.

The Header consists of the following fields:

Data Length (number of bytes of the group Data)

Optional Length (number of bytes of the group Optional Data)

Packet Type (RADIO, RESPONSE, EVENT, COMMAND ...)

The Data field encodes the ESP3 command together with the required parameter data. For

some commands, the Optional Data field is used to provide additional parameter data.

Heade

Data

Optional Data

Sync Byte

CRC8 Header

CRC8 Data

Data Length

Packet Type

Optional Length

ESP3 Packet Structure

ESP3

Packet

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

3.3 Supported ESP3 commands

The following ESP3 commands are supported by TCM 515:

Type 1: ERP1 Radio Telegram

Type 2: Responses

oRET_OK

oRET_ERROR

oRET_NOT_SUPPORTED

oRET_WRONG_PARAM

oRET_OPERATION_DENIED

oRET_LOCK_SET

oRET_BUFFER_TO_SMALL

oRET_NO_FREE_BUFFER

Type 4: Events

oSA_CONFIRM_LEARN to confirm/discard learn in/out

oCO_READY to indicate wake up from deep sleep initiated by CO_WR_SLEEP

oCO_EVENT_SECUREDEVICES to inform about security processing issues

oCO_DUTYCYCLE_LIMIT to inform about a current limitation due to duty cycle

Type 5: Common commands

oCO_WR_RESET to reset the device

oCO_RD_VERSION to read SW/HW versions, chip ID etc.

oCO_GET_FREQUENCY_INFO to read the operating frequency of the device

oCO_WR_STARTUP_DELAY

oCO_WR_SLEEP to put the device into low power sleep mode

oCO_WR_IDBASE to set the Base ID range

oCO_RD_IDBASE to read the Base ID range

oCO_WR_REPEATER to set repeater functionality

oCO_RD_REPEATER to read repeater functionality

oCO_WR_FILTER_ADD to add filter to filter list or to selective repeating

oCO_WR_FILTER_DEL and CO_WR_FILTER_DEL_ALL to delete filters

oCO_RD_FILTER to read the configured filters

oCO_WR_FILTER_ENABLE to enable/disable the configured filters

oCO_WR_LEARNMODE to set learn mode

oCO_RD_LEARNMODE to read learn mode status

oCO_WR_WAIT_MATURITY to wait until the end of the maturity time

oCO_RD_DUTYCYCLE_LIMIT to read the duty cycle (for 868 MHz EU version)

oCO_SET_NOISETHRESHOLD to set the input noise rejection threshold

oCO_GET_NOISETHRESHOLD to read the input noise rejection threshold

oCO_WR_REMAN_REPEATING to set the repeater level of Reman messages

oCO_RD_REMAN_REPEATING to read the repeater level Reman messages

oCO_SET_BAUDRATE to set the baud rate of the ESP3 interface

oCO_WR_SECUREDEVICE_ADD

oCO_WR_SECUREDEVICE_DEL

oCO_RD_SECUREDEVICE_COUNT

oCO_RD_SECUREDEVICE_BY_INDEX

oCO_RD_SECUREDEVICE_BY_ID

oCO_WR_SECUREDEVICE_SENDTEACHIN

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

Type 6 Smart Acknowledge commands (postmaster / mailbox functions)

oSA_WR_LEARNMODE to set/reset Smart Acknowledge learn mode

oSA_RD_LEARNMODE to get learn mode

oSA_WR_LEARNCONFIRM to add or delete a mailbox of a client

oSA_WR_RESET to send a reset command to a client

oSA_RD_LEARNEDCLIENTS to get learned mailboxes/clients

oSA_WR_POSTMASTER to activate/deactivate post master functionality

Type 7 Remote Management

oMessages with up to 255 byte of payload

Type 10: ERP2 Radio Telegram (TCM 515U only, selected using CO_WR_MODE)

3.4 Persistent versus not persistent configuration settings

TCM 515 will store certain configuration settings in persistent memory, i.e. those settings

will be maintained even after a power cycle.

There are three classes of persistent settings:

1. Repeater and filter configuration

Starting from product version DA-08 (see chapter 12), the repeater and filter con-

figuration defined via the following commands will be maintained after power failure:

oCO_WR_REPEATER

oCO_WR_FILTER_ADD

oCO_WR_FILTER_DEL

oCO_WR_FILTER_DEL_ALL

oCO_WR_FILTER_ENABLE

2. List of secure devices as defined by the following commands:

oCO_WR_SECUREDEVICE_ADD

oCO_WR_SECUREDEVICE_DEL

3. System parameters as defined by the following commands:

oCO_WR_STARTUP_DELAY

oCO_SET_NOISETHRESHOLD

oCO_WR_IDBASE

All other settings need to be reinitialized at power up.

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

4Telegram transmission

4.1 Transmission flow

TCM 515 performs the following functions to transmit radio telegrams:

Telegram input

TCM 515 receives the radio telegram data from the external host via the ESP3 inter-

face as described in chapter 3

Security handling

Telegrams to receivers supporting high security mode can be automatically encrypt-

ed and authenticated according to the parameters specified by their outbound se-

cure link table entry as described in chapter 6

Telegram transmission

Processed telegrams will be transmitted as a set of redundant subtelegrams as de-

scribed in chapter 4.2

Figure 6 below shows the process for the transmission of EnOcean radio telegrams.

Figure 6 –Telegram Transmission Flow

USER MANUAL

TCM 515 –ENOCEAN TRANSCEIVER GATEWAY MODULE

4.2 Subtelegram Timing

EnOcean radio systems use the concept of redundant subtelegrams in order to increase the

communication reliability. In addition to using redundant transmissions, first and second

level repeaters can be used to increase communication distance and reliability as described

in chapter 4.5.

Within this scheme, telegrams are transmitted redundantly with random (but small) delays

between them. The total number of redundant subtelegrams can be either two or three.

Certain telegram types (e.g. within remote commissioning functionality) do not support

redundant transmission, i.e. they are transmitted only once.

If a telegram is transmitted redundantly as set of two or three subtelegrams then the first

subtelegram is sent immediately upon receiving and processing the ESP3 command for tel-

egram transmission.

The timing offset between this first subtelegram and the remaining (second or third) sub-

telegrams is random within pre-defined time intervals.

For the case of the sender, the time offset (interval) between the first subtelegram and the

second subtelegram is a random value between 1 ms and 9 ms. Likewise, the time offset

(interval) between the first subtelegram and the third subtelegram is a random value be-

tween 20 ms and 39 ms.

For the first-level repeater (which received the telegram from the sender), the time offset

(interval) between the reception of the telegram and the transmission of the first subtele-

gram is a random value between 10 ms and 19 ms. Likewise, the time offset (interval) be-

tween the reception of the telegram and the second subtelegram is a random value be-

tween 20 ms and 29 ms.

For the second-level repeater (which received the telegram from the first-level repeater),

the time offset (interval) between the reception of the telegram and the transmission of the

first subtelegram is a random value between 0 ms and 9 ms. Likewise, the time offset (in-

terval) between the reception of the telegram and the second subtelegram is a random val-

ue between 20 ms and 29 ms.

Both first and second level repeaters do not transmit a third subtelegram. The subtelegram

timing is summarized in Table 2 below.

Table 2 –Subtelegram timing

Repeater Level

Time Offset [ms]

First Subtelegram

Time Offset [ms]

Second Subtelegram

Time Offset [ms]

Third Subtelegram

0 (Original Telegram) 01 … 9 20 … 39

1 (Repeated for the first time) 10 … 19 20 … 29 No 3rd Subtelegram

2 (Repeated for the second time) 0 … 9 20 … 29 No 3rd Subtelegram

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