Konica Minolta FK-101, Service Manual

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B. Signal format
1. Preamble: a signal added before each signal when CI, CM and JM signals are sent.
Format: 1110000000001 (for CI)
+0000001111 (for CM and JM)
2. Common format among each signal CI, CM and JM
Start Bit (=0) is put at the top and Stop Bit (=1) is put at the end of each octet.
Head octet
Start bit
b0 b1 b2 b3 b4 b5 b6 b7
Stop bit
0 4 bits
3 bits
0 1
Expansion octet
Start bit b0 b1 b2 b3 b4 b5 b6 b7 Stop bit
0
3 bits
2bits 0 1
(1)
(2)
(3)
0 1
(1) :Category tag (tags which represent information types)
Bit assignment Meaning (information type) Included signal
b0 b1 b2 b3
1 0 0 0 ... Call Func Top of CM, JM /
CI
1 0 1 0 ... Modulation Mode CM / M
0 1 0 1 ... Protocols CM / M
1 0 1 1 ... GSTN access CM / M
(2) :Option bit (Differs depending on category tags. Refer to the next item, bit definition.)
(3) :Additional option bit (Differs depending on category tags. Refer to the next item, bit definition.)
Common signal bit definition
2-1. Call Function (1 octet)
0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 b
1 0 0 0 0
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1
Top octet
Meaning
(Call Function category tag)
V18 text phone
Video tex
FAX transmission from the calling terminal
FAX reception in the calling terminal
Data transmission / reception
Expansion octet= with Call Function represented by next octet
(Other than the above=Reserved)