sTTJDtrR Rd/OX
c274
LA
rerording
ere again displayed
(in
the
case of
the
counter thig
would be
the real-time
counter,)
The
last values
read from tape
can be reEalled
on
the
display by
pressing
the stop
key'
provided
the tape
has
not advanced
yet.
The
reäding operation
is only
per{ormed
in C-TRACK
mode,
however, it is
enabled
Feqardless
of the
setting o+
the output
selector.
In sync
mtrde the data
are
read from
the record
head.
F-l-.av*-w.i..t b_.r-e*-q-sr**d_-e.d-_'-9-o_U|.t.*e_r-."-"(r-e*a-l--"-l-f
-O-p*
Lo*tl.llgFr..l-
I{
the mechine
detects in
play
mode that
the
data
relate
to the
counter
content. the
mechanically
irnplenented reat-titne
counter
is overwritten
with
this
value
snd the
tape is
continuously
resynchronized,
For this
reason there cannot
be
two
di{ferent
counter
contents,
whether in
rect:rd
trr in
reFrodlrce
mode.
Note:
I+ the counter
centent
is utrdated
by
the
recorded
counter reading.
the addresg
locator
is
not recBmputed.
S.S.an:.sh_inS."._ä_-t-ajp*e_l_o*g__e-t*j-*e3--..-*---.
Hith the
seärch key and
the reai-time ceunter
you
can locate
a tape address
based on the
recorded
time or date.
The
desired
value is entered
with
SELECT tEll and STEP tgl
as was done when
the däta
were stored, and the
search
proceFs
iE initiated
with the SEARCH tlll
k.ey-
The
tape
advänces
in
spooling
mode t6 a
position
that is a few
seconds
aheäd of the desired location.
The exact location
ig
then approached
in
play
mode, There are
two
gearch
algorithms that can be
modi{ied via the
RS 732
inter*ace:
r
One
+(]r uninterupted
time recerding and
r
Dne
'for
non-sequenti.ai
timE recording.
The default rnethod of the
C774
iE the
{irst one,
In
the seärch
with non-sequential tirne
recording the
tape Location is searched
in steps that become
smÄIler and smeller. If the
gearched
Iocation
doeg
not exist on tÄFe, the tape
stops at the
gtert
o{
the next higher väIue or at the end of
the data
recording. or
when
the
transparent tape is reached.
In the
search algorithm for contiguous recordineo
the location
is searched directly by computing
the
dif{erence between the
gtart
end target address
which is translated into
a tape length via
the
real-tine
counter. If the correct tape
location
is
not found, a setrt]nd
ättempt is made so that
a tape
location will be found even i{ there are
small
gaps
in the time code. cau=ed
by tape editing.
To
prevent
unthreading
of
the tape. the
transparent
leader
must be suf{iciently
long so that
the
recorder does not Evershot]t
it when decelerating
to a
stop during the spooling
{unction.
In the C.774 the
gearch
based on date
is not
iinple.nented
because this
would not make much
senset
given
the
meximurfi
recording
durätion of about
S
hours.
Searching for a code
is
not
feasible becau=e
the
data channel cannot be
read
in spooling
mode'
FIS 232 i nterf ace
The folltrbring
commands or feedback=
are
possible
via
thig interface:
r
Data recording
on/of{.
r
Store data
to be recorded: time. date,
code,
and
counter
reading
r
Recall
stored däta
r
Data
type
to
be
recoFded: time onlyo
date onlyt
code
only,
counter only, or
any combination
of
tr.ro o+
these.
Recall
the date that are
read +ro,n tape
(values
before
and after
error trorrection)
Enter
the
deta based on which
a tape lotration
is
to be
seärEhed: counter and time.
Select
the search algt:rithm for uninternpted
and
non-gequential
recording.
V*ar:*.i".=:-e-e,-d,"-
Nhen data
recording is activäted,
varispeed
is
inhibited,
or cancelled
when tr-TRACK is
activated.
However!
the software is
able to read the
data
with speed
deviations up to
+1O7.
Sp*e--eC.""
I+ än
attenpt
iE made to read the data
at the
wrong
speed, the characters
äre
displayed.
lrlhen
the
SEARCH key is
pressed,
the
machine
automatically selects
the correct speed
and
enters
stotr
mode
i4
reading is not
possible.
älz-n-q,hr--o-"n."i
-z--e-t.i-
9.-n--.,-e-f--.'--e--qg.l E-o-e--o-!-'--F-v,,-,0-e*B--n..F-..-o--f--
the
data
code
If en external unit
is synchronized via the RS ?5?
inter{ace
based on the recorded counter sr
titne
code,
the follor+ing should be tal:en into
consideretion:
The recording of the counter is synchronized with
the tacho
signal of
the
real-ti.me
counter.
the time
recording
is eynchronized
with the
built-in clocl-;.
This ensures
that i4
small drifts in the
data occur,
the values
will not
jump
suddenly by
a
glhole
second.
If the
CAUHTER and the
TII'IE are recorded
simulta-
neoLrsly, the time is ursed for synchronization. This
meÄns
thet i+ the CDUNTER data are
used
{or syn-
chronization.
the value can
jump
in
one second in-
crementg
due to the
drift in the tacho
roller t4l.
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