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HDLC Notes
Commands must be correctly framed to be accepted by the modem. The address field must be
FF, the control field must be 03 (hex) or 13 (hex) or a bad FCS field or an abort is received.
If a succession of V.25bis indications are to be sent to your computer, the poll bit (or final bit)
will be set to zero for all but the last V.25bis indication, to signify that more V.25bis indications
follow.
Control characters that do not form part of the frame are treated as a normal characters. This
usually results in the modem issuing an INV indication.