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=== ISKRA MT174 ===
[[File:ISKRAMT174.png|thumb|ISKRA MT174]]
ISKRA MT174 (230/400V, rated 85A) mostly used in Saxonia
this seems to have some noticable semaphores wich can be visualy inspected:
KD = lid/cover open (there must be a switch somewhere) BAT = internal battery low DÜ = transmission mode FF = "Fatal" counter (?) SET = counter in program mode
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.