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OPERATING
TEMPERATURE LIMITATIONS
The
cassette recorder is recommended for use
in
an envirohmental operating
temperature
range of
0'tro +40"C. Temperatures
below
0"C
may cause
@pe
speed
variation in excess of
that which
cfn
be
tolerated during playback.
Data Recorded with
the RC35 outside the
0'C
to
40'C
ranEe
may
be unreadable.
VOLUME
CONTROL
When recor{ing data, the RC35's volume setting
does not
m{tter.
The recorder
is
equipped with
an
automatit gain controlwhich controls the
recorded si$nal
level.
For playback,
a mid range
volume settifrg is normally required.
CASSETTE
TAPES
Normal biaq, high quality cassette
tapes are
recommendEd
for use with the recorder. The
more
expensive high bias chromium oxide tapes
will NOT pefiorm satisfactorily. Although the
use of C-90
tapes is generally successful,
Campbell
Sfientific
recommends
the use of C-
60 (30
minufles
per side)
cassettes. TDK,
Maxell, and equivalent quality cassette tapes
perform well and
are readily
available.
Bargain-
priced tapeg have
often performed poorly and
are
not recommended.
New
tapes 4re often tightly wound, creating
enough drag or pressure to cause the tape
recorder
to fpop"
out
of
the record
mode.
This
potential
loEs
of
data may be overcome by fast-
forward/rewinding
the entire tape before placing
it
in
service.
4.3.2
CASSE1TE CONNECTOR INTERFACE
CABLES
]
A Cassette
fnterface Cable is required to
connect
thelcassette recorder to the
21X. Two
models
are
lavailable. The SC92A is
a
WRITE
ONLY
inter{ace. The SC93A
READ
A/RITE
SECTION
4.
EXTERNAT
STORAGE PERIPHERALS
interface
is
only necessary
if
the
21X has
special software for transferring programs via
tape (Appendix
B).
The SC92A and SC93A have
a
combination
backshell circuit card and 9-pin connector which
attaches to
the serial l/O connector on the 21X.
The SC92A has two plugs which connect to the
POWER
and MIC jacks on the recorder. The
SC93A has
three plugs which connect to the
POWER, MIC and EAR (or MONITOR) jacks
on
the
recorder.
Both cables
transform
12V
from
the 21X
to 6V to power the recorder during
periods of data
transfer.
Additional circuitry
shapes the data
signalwaveform.
4.3.3 TAPE FORMAT
Data tapes generated
by
the 21X
are
read by
the PC201 tape read card for the IBM PCD(T/AT
or by
the C20 Cassette Interface. The C20
decodes the
tape and transmits the data
in
ASCII
via
a
standard RS232 interface.
TABLE
4.3-2.
Format 2
Specifications
l
I
I
I
I
I
I
POWER SUPPLY
I
The
21X's irjternal power supply will power the
recorder
durf
ng periods of data
transfer, but will
NOT be avaflable
to play, advance, or back-up
tapes.
In
orfer
to perform these functions
during setup and
check-out operations, the
recorder reqpires 4 alkaline AA batteries
or
the
120
VAC adhpter.
Data
Low Resolution
High Resolution
C-60 Capacity
(Lo Res.)
Data
Transfer
Rate (Lo Res.)
Block Size
locations
Binary
2 bytes/data point
4 bytes/data point
180,000
data points
(1
side only)
100
data points/sec.
512 FinalStorage
4.3.4
CONNECTING
TAPE RECORDER TO 21X
The procedure for setting
up
the
21X and
cassette recorder for transfer to tape is as
follows:
1.
Load
a
cassette
in
the recorder and
advance the tape
forward until the tape
leader is past
the recording
head.
(lnternal
batteries or
AC power required.)
2.
Connect
the SC92A or SC93A to the 9-pin
serial l/O port.
4-5
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