Canon FACSIMILE BASIC 2000 Service Manual page 251

A Address field
Although this is used for the terminal device ID in data communica-
tions, it is fixed to a single format for the facsimile.
Format 11111111(=FF H)
Remarks Signal for maintaining the format of HDLC
C Control field
This is used to control the terminal device in data communications, and
to determine whether that the frame is the final frame or not in the case
of multiple frames.
Format In case of final frame 11001000 (=C8H)
In case of non-final frame 11000000 (=C0H)
Remarks
FCF Facsimile control field
Shows the type of binary signal and the name of the binary signal used
for the frame.
Format Refer to Table 5-14. 8-bit or 16-bit
Remarks 16 bits of FCF1 and FCF2 are used in ECM.
FIF Facsimile information field
This indicates the details of facsimile capabilities that FCF cannot cover.
The length of this field is not fixed.
Format See 6.8.4 Details of FIF.
Remarks
FCS Frame checking sequence
This sequence is used to check whether there are transmission errors in
this frame.
Format 2-byte code
Remarks See Note on page 5-121.
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