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The IR-Interface is claimed to be IEC 62056-21 mode C (asynchron, half-duplex, 300 - 19.200 baud, 7bit, even parity, 1stop (1_7D_1P_E_1S) and it is bidirectional. So one can also send something over that interface. There's an optional RS485 wire interface on some models.
The "Fatal counter" is a hex value 8bit flag register: 0 = Firmware error 1 = Counter parameter checksum error 2 = energy/maximum checksum error 3 = not used 4 = not used 5 = not used 6 = maintenance warning level (?) 7 = not used [https://www.youtube.com/watch?v=fOnKzUN7SzU Tampering / manipulation log video]
[[File:ISKRA LOG.png|thumb|FIFO logbook P.98.1 for 74 "possible misuse type events"]]
