USER MANUAL
ETHSA / ETHSU
ENOCEAN TEMPERATURE AND HUMIDITY SENSOR
© 2022 EnOcean | www.enocean.com
F-710-017, V1.0
ETHSx User Manual | April 2022 | Page 16/27
3.6
Radio Telegram Format, EEP
3.6.1
Standard Mode
ETHSx transmits a radio telegram according to EnOcean Equipment Profile EEP A5-04-03 as
defined in the EEP EnOcean Equipment Profiles specification:
3.6.2
Secure Mode and Secure Telegram
In Secure Mode the payload content of the telegram is protected with advanced security
features. Normal operation telegram payload and also Teach-in telegram payload both are
protected in the same way. The security features used are defined by the Security Level
format - SLF. This parameter is set by default to following values (Stepcode DE and later):
◼
24-bit RLC which starts from 0 at production
◼
RLC sent explicitly
◼
3-byte CMAC
◼
VAES encryption
The security features are added to the communication by encapsulating the payload and
Teach-in telegram payload into a secured telegram. The payload itself is not changed and
corresponds to the standard mode payload like defined by EEP D5-00-01. Please refer to the
EnOcean Security Specification for details:
http://www.enocean.com/en/security-specification/
3.6.3
Secure Learn Telegram
In standard mode an 1BS teach-in telegram is transmitted by pressing the LRN button. To
process secured communication on a receiver the ETHSx has to send a security teach-in
telegram to the receiver and so inform him about the used security profile, AES key and
initial RLC counter. The security teach-in has to take place before any other communication
can be executed (profile teach-in included). Press the LRN button to trigger the transmission
of the teach-in telegram. The security teach-in and then the profile teach-in are transmitted.
The profile teach-in telegram is already protected by advanced security features. The process
of sending security teach-in telegram and profile teach-in telegram is triggered by pressing
the LRN button in secure mode, the behaviour of the LRN button is following:
1.
Button is pressed
2.
Security teach-in is send.
3.
Profile teach-in is send.
For more information on the structure of the teach-in telegram please refer to chapter 4.2 of
the EnOcean Security Specification:
www.enocean.com/security-specification