Operator`s manual

SECTION 4. EXTERNAL STORAGE PERIPHERALS
4-6
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 until the 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. If the Start
of dump location is equal to the End of
dump location, the 21X will write a "dummy"
block of data to tape.
If 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 (SM192/716)
The Storage Module stores data in battery
backed RAM. Backup is provided by an internal
lithium battery. Operating power is supplied by
the 21X 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
INSTRUCTION 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 tell when the Storage Module is
connected. Each time Instruction 96 is executed
and there is data to output, the 21X checks for
the presence of the Storage Module. If 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. Immediately upon connection, a File Mark is
placed in the Storage Module Memory
following the last data stored.
2. During the next execution of Instruction 96,
the 21X detects the Storage Module and
outputs all data between the PPTR and the
DSP location.
The File Mark allows the operator to distinguish
blocks of data from different dataloggers or from
different visits to the field.
If 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 Final Storage
to the SM192 and SM716 can be manually
initiated in the *9 Mode. The procedure for
setting up and transferring data is as follows: