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21
X MICROLOGGER OVERVIEW
The
21X
Mi
ologger combines
precision measurement
with
processing and control capability in a single
battery oper ted system.
Campbell
SQientific,
lnc.
provides three documents
to
aid in understanding and operating
the
21X:
1.
This
Overuiew
2. 1
The
21X Operator's Manual
3. I
fne
21X Prompt Sheet
i
This
Overui$w
introduces
the
concepts required to take advantage of
the
21X's
capabilities.
Hands-on
programmin! examples
start
in Section
OV4.
Working with
a
21X will help the learning process, so don't
just
read tha examples, turn
on
the
21X and do
them.
lf
you want
to
staft this minute,
go ahead and
try
the exampldp, then come back and
read
the
rest
of the Overview.
The
sectiong
of the Operator's
Manualwhich should be read
to
complete a
basic understanding of the
appropriate
are the
Programming Sections
1-3, the
portions of the data retrieval Sections
4
and
5
the
method(s)
you are using (see
OVS),
and
Section
14
which covers installation
and
Section
6
details
of
serialcommunications.
Sections
7
and
I
contain
programming examples.
Sections 9-
have detailed descriptions of
the
programming instructions, and Section
13
goes into
detailon
2
1
X measurement procedures.
The
Sheet
is an abbreviated description
of
the
programming
instructions.
Once
familiar with the
21X, it is
to
program it using only the Prompt
Sheet
as a reference, consulting the manual
if
further
is needed.
Read
the
SQlected
Operating Details
and Cautionary
Notes
at the front of the Manual before using the
21X.
OV1.
PHYSIDAL DESCRIPTION
The 21X Mifrologger is shown in Figure OV1-1.
The
21X is powered with 8 alkaline "D" cells
and has
onlf the
power switch on the base.
The
21XL
ig
powered
with rechargeable lead
acid
cells add,
in
addition to
the power switch,
has
a
chargpr input plug and an LED which
lights when
fhe charging circuit
is
active.
The
21XL
shoulfl always be connected to a solar
panel or AC
charger. The
lead acid batteries
provide
bacfiup
in
event of a power
failure but
are permanpntly
damaged
if
their
voltage drops
below 11.74
volts.
Campbell Scientific
does
not
warrant
bafleries. The
battery
base
is
the only
difference between
the 21X and the 21XL.
The
16
chafacter keyboard is used to enter
programs, qommands and
data;these
can be
viewed on
tfie 8 digit display (LCD).
FIGURE
OV1-1. 21X Micrologger
ov-1
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