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SECTION
4.
EXTERNAL STORAGE PERIPHERALS
3.
Insert
the plugs
on
the free end
of
the
SC92A or SC93A into
the DC-IN and MIC
(and Ear
if
SC93A)
jacks on the recorder.
4.
Simultaneously press
the RECORD and
PLAY buttons on
the recorder to set
it
for
recording. With the DC-IN Jack plugged
in,
the tape
will not move
untilthe
dump occurs.
5.
To test
connections manually initiate
transfer
by keying
in
the
*8
commands as
listed
in
Table
4.2-1.
The
tape should
advance as
data
is
transferred.
lf
the
Start
of
dump location
is
equalto the
End of
dump location, the 21X
willwrite
a "dummy"
block
of
data to tape.
lf
you
are leaving the recorder on-line (tape
enabled
with Instruction 96) it
is
a good idea to
write
a
dummy block of data to
tape
(5
above)
to
ensure that
the recorder
is
correctly connected.
Leave the 21X
in
the
*0 Mode.
4.4
STORAGE MODULE
(SMl92n161
The Storage Module stores
data in battery
backed
RAM.
Backup is provided by
an internal
lithium
battery.
Operating power
is
supplied by
the
2'lX
over
pin
1 of
the 9 pin connector. When
power
is
applied to
the Storage Module, a File
Mark is placed
in
the
data (if a File Mark is not
the last data point already
in
storage).
The File Mark separates
data.
For example,
if
you retrieve data from one 21X, disconnect the
Storage Module and connect
it
to
a
second 21X,
a File Mark is placed
in
the
data.
This mark
follows
the data from the first 21X but precedes
the data from
the second.
The SM192 has 192K bytes
of RAM storage; the
SM716 has
716K
bytes.
Both
can
be
configured
as
either ring or fill and stop memory.
4.4.1
USE OF
TWO STORAGE MODULES
It
is possible to connect
two Storage Modules to
the 21X for on-line
storage. One
module must
be
configured as
fill and stop and the other as
ring memory (see Storage Module operator's
manual
for configuring information). Data
is
written
to both modules simultaneously. The
module configured as
fill and stop quits
accepting data
once it
is
full while that with
the
ring memory continues to store new data
over
old.
The Storage Modules must be retrieved
before
the module configured as ring memory
wraps
around memory a second time.
4.4.2
STORAGE MODULE USE WITH
TNSTRUCTTON
96
. When output to
the Storage Module
is
enabled
with Instruction 96, the Storage Module(s) may
be
either
left
with the 21X for on-line data
transfer and periodically exchanged,
or brought
to
the site for data transfer.
USE OF STORAGE MODULE
TO PICK
UP
DATA
The 21X can
tellwhen the
Storage Module
is
connected.
Each
time Instruction 96
is executec
and
there
is
data to output, the 21X checks
for
the presence
of
the Storage
Module.
lf
a
Storage Module is
not
connected
no
data are
sent and
the Printer Pointer (PPTR, Section
2.1)
is not advanced.
When a Storage Module
is
connected, two
things happen:
1.
lmmediately upon connection,
a File Mark
is
placed
in
the Storage Module Memory
following
the last data stored.
2.
During
the
nelt
execution
of Instruction
96,
the 21X detects
the Storage Module and
outputs all data between
the PPTR and the
DSP localion.
The File Mark allows the operator to distinguish
blocks of data
from different dataloggers
or
fron
different visits to the
field"
lf the SM
is
just brought to the site to pick-up
data, the SC90 Serial Line Monitor
can be used
to visually confirm that data were transferred.
The SC90 contains an LED which lights during
data
transmission. When the light goes OFF
data
transfer
is
complete and
the SM can
be
disconnected from
the 21X.
4.4.3
*9 DUMP TO STORAGE MODULE
In
addition to the on-line data output procedures
described above, output from
21X FinalStorage
to the SM192 and SM716 can be manually
initiated
in
the
*9
Mode. The
procedure
for
setting up and transferring
data
is
as follows:
4-6
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