BEL 6110, Руководство оператора и по обслуживанию, Страница: 9 / 29

SERIAL CONTROL
The BEL 6110 can be controlled by the editing equipment, be sending commands
down a serial communication line. The serial communication protocol must conform to the
RS422 standard as implemented by SONY©. The BEL 6110 memory will appear to the
user exactly like a section of tape which has been pre-striped. The stripe can be set to start
on the hour from 0 to 23 hrs, and the length of recording which can be accommodated will
depend on the size of the installed memory (42, 84, or 168 seconds for stereo). The
ÒWindowÓ provided by the BEL 6110 memory can be recorded and replayed in the same
way as magnetic tape. If recording is attempted outside this window, then no recording will
take place, and no record flags will be returned by the equipment.
The serial mode is selected from the Set-Up menu. The SONY© protocols shown in
Section 7 are accepted by the BEL 6110. The unit will identify itself as a BVW 75 recorder.
This particular tape recorder system was selected because it responds to a set of
commands similar to those supported by the BEL 6110. However, the BEL 6110 does not
exactly mimic this tape recorder. In particular, the BEL 6110 is a purely electronic device,
as such it is not subject to the inertial effects invariably present in any mechanical tape
recorder. To the user, the response of the BEL 6110 appears to be instant. The main
differences in operation can be summarised as follows:-
a) Jog, Shuttle and DMC
Each time a request to move one frame in either direction is detected, the BEL 6110
will respond by playing a 0.1 second burst of audio in the forward directional normal speed.
This facility eases the precise location of any required sound.
b) Cue-up with DATA and PRE-ROLL
These macro commands operate considerably faster on the BEL 6110 than is
possible on any tape based system. The cue point (or pre-roll point) is found in a maximum
of 60 microseconds from receipt of the relevant command.
c) Transport commands
Commands such as Stop, Rewind, Fast Forward, etc., become effective immediately
they are received. No delay will be apparent, since there is no mechanical inertia in the
system.
STRIPING
The memory in the BEL 6110 is striped when any roll mode is selected. (The stripe
setting is in one hour increments from 0 to 23 Hrs.) Any audio information stored in the
memory at this time is preserved, but the associated time code is over-written.
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