USER MANUAL
STM 429J – Scavenger Transmitter Module
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STM 429J User Manual | v2.0 | Nov 2017 | Page 10/ 17
teach-in. The following 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 once pressing the LRN button.
The behaviour of the LRN button in enhanced mode is following:
1.
Button is pressed
2.
Security teach-in is send.
3.
Profile teach-in is send.
2.3.3.1
PSK Security Teach-in - optional
The Security Teach-in telegram carries the information of KEY and RLC. This information is
either sent as plain text (as is) or it is protected by the pre-shared key - PSK. The PSK
must be in printed on the transmitting device. To use PSK teach-in, the PSK must be read
by the end-user and entered into the other communication partner. For this purpose the
EnOcean radio interface cannot be used. The PSK can be entered trough a user interface or
semi-automated by a code reader.
For details on the PSK Teach-in please refer to the EnOcean Security Speification.
PSK feature is disabled by default. To enable PSK feature the execute configuration in Dol-
phin Suite.
2.4
Transmit timing
The setup of the transmission timing allows avoiding possible collisions with data packages
of other EnOcean transmitters as well as disturbances from the environment. With each
transmission cycle, 3 identical subtelegrams are transmitted within 25 ms. The transmis-
sion of a subtelegram lasts approximately 1 ms. The delay between the three transmission
bursts is affected at random.
