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21
X MICROLOGGER OVERVIEW
OV3.4
INSTRUCTION
FORMAT
Instructions
are identified by an instruction
number.
Each instruction has a number of
parameters
that give the 21X the information
it
needs to execute
the instruction.
The
21X Prompt Sheet has the instruction
numbers in red, with
the parameters briefly
listed in columns following the description.
Some parameters are footnoted with
further
description under
the "lnstruction Option Codes"
heading.
For
example, lnstruction
73
stores
the
maximum value that
occurred in an Input
Storage Location over the
output interval. The
instruction has
three parameters
(1)
REPetitionS,
the number of sequential lnput
Storage locations on which to
find maxima,
(2)
TIME, an option of storing the
time of
occurrence with
the maximum value, and
(3)
LOC the
first Input Storage Location operated
on
by
the Maximum Instruction. The codes for
the
TIME parameter are listed
in
the "lnstruction
Option Codes".
The repetitions parameter specifies how many
times
an instruction's function
is
to be repeated.
For example,
four
107
thermistor probes, wired
to single-ended
channels
1
through 4, are
measured using a
single Instruction
11,
Temp-
107,
with
four repetitions. Parameter
2
specifies
the input channel
of
the first
thermistor
(channel
1)
and parameter 4 specifies
the Input
$torage Location
in
which to store
measurements from the first
thermistor.
lf
Location
5
were used, the temperature of the
thermistor on
channel
1
would be stored in lnput
Location
5,
the temperature from
channel2
in
Input Location 6,
etc.
Detailed descriptions
of
the instructions are
given in Sections 9-12.
OV3.5
ENTERING
A
PROGRAM
Programs are
entered into the 21X in one of
four ways:
1.
Keyed in using the
21X keyboard.
2.
Loaded
from a pre-recorded listing using
the *D
Mode.
There are 2 types
of
storage/input:
Stored on
disl</sent
from
computer
(PC208 software TERM
and EDLOG).
Stored/loaded
f
rom
SM1
92t1
6
Module
3.
Loaded
from Storage Module or internal
PROM (special
software) upon power-up.
A program
is
created by keying
it
directly into
the datalogger as described
in
the following
Section, or on
a PC using the PC208
Datalogger Support Software.
EDLOG and TERM
are PC208 Software
programs used
to develop and send programs
to the
21X.
EDLOG
is
a prompting editor for
writing and documenting programs
for Campbe
Scientific
dataloggers. Program files developed
with EDLOG can be downloaded directly to the
21X using
TERM. TERM
supports
,
communication via direct wire, telephone,
or
Radio Frequency
(RF).
Programs on disk
can
be
copied
to a Storage
Module with
SMCOM.
Using the
*D Mode to
save or load
a program from a Storage Module
is
described in
Section
1.8.
lf
the SM192/716 Storage Module
is
connected
when the
21X is powered-up the 21X will
automatically load program number 8, provided
that
a program 8 is loaded
in
the Storage
Module (Section
1.8).
It
is also possible (with special software) to
create
a PROM (Programmable Read Only
Memory) that
contains
a
datalogger program.
With
this PROM installed
in
the datalogger, the
program
willautomatically be loaded and
run
when the datalogger is powered-up, requiring
only that the clock
be
set.
OV4.
PROGRAMMING EXAMPLES
We
willstart
with a
simple programming
example. There
is
a brief explanation of each
step
to help you follow the
logic.
When
the
example uses an instruction,
find it
on
the
Prompt Sheet and follow through the
of
the parameters. Using the Prompt Sheet
while going through these examples
will help
you become familiar with
its
format.
Sections
9-
12 have more detailed descriptions
of
the
instructions.
a.
b.
ov-8
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