USER MANUAL
TCM 410J
–
Transceiver Module
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TCM 410J User Manual | v2.3 | June 2022 | Page 20 / 46
3.2.1
Setup of security information in the inbound secure link table
For the processing of received messages, it is required to receive the security information
of the transmitting device in a teach-in message. TCM 410J must be put into LRN Mode us-
ing the ESP3 command CO_WR_LEARNMODE to accept the teach-in message. Otherwise (if
not in LRN mode), the teach-in message is ignored.
If a PSK (pre-shared key) is used to protect the content of the teach-in message, then the
PSK must be setup using the ESP3 command CO_WR_SECUREDEVICE_ADD_PSK before the
teach-in message is received.
After a successful teach-in process the whole teach-in message is provided to the host as
one serial message of Packet Type 10.
Once the security information of a transmitting device has been setup, TCM 410J can auto-
matically decode secure messages from this device.
Other received telegrams (for which no security parameters have been setup) will be for-
warded without processing to the host via the ESP3 interface as serial message of Packet
Type 10.
3.2.2
Resynchronisation of Learned-in Secure Devices
During normal operating mode (not teach-in mode) teach-in requests from unknown de-
vices are ignored.
If a learned-in device sends a teach-in request and the security key is correct, then the RLC
code information is updated. This is addressing the case where the receiver and sender
’s
RLC become desynchronized.
If a learned-in device sends a teach-in request and the security key is not correct, then
TCM 410J will inform the host about a potential security issue using the ESP3 event
CO_EVENT_SECUREDEVICES
