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m4a5a_v320_eng (14.02.2013)
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Kompetent für Elektroniksysteme
m4a5a_v320_eng (14.02.2013)
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Kompetent für Elektroniksysteme
FFSK Encoder
The 5 digits of the producer identification and the call (4
th
- 8
th
digit in the 8-digit FFSK telegram)
are treated in the same way as for 5-tone telegrams. The digits that should not be entered via the
keypad are invariably coded. Invariable digits can be located anywhere throughout these 5 digits.
Hence, it is also possible to invariably set digits 4, 6 and 8 of the FFSK telegram. In this case,
digits 5 and 7 areentered via the keypad. Usually, the first 2 digits (producer indentification) or the
first 3 digits (producer identification and first digit of the call) are preset. The digits that are to be
entered by the keypad are always displayed right-justified. The encoder is programmed in register
010 (see section Transmitting of 5-Tone Sequences).
FFSK Decoder
For all telegrams the CMO is checked. If the CMO is consistent with register 091 (digit 2), the
encoder is activated. The encoders are coded in registers 020-029, 030-039 and 040-049 (see
Table of Registers). The recognized telegram is compared to the decoder values, accepting
all values at digits that are programmed with an ‘F’. After a positively recognized telegram, the
loudspeaker and the earphone are switched on, the loudspeaker display flashes, depending on
the settings the FFSK acknowledgement is sent and the alarm tone is activated. An additional
comparison to other decoders is not performed.