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SECTION
1.
FUNCTIONAL MODES
1.6
MEMORY TESTING AND SYSTEM
STATUS. -B
The.B
Mode is used
to 1) read the signature of
the program memory and the software PROMs,
2) display
the power-up memory status,
3)
display
the number of E08 occurrences (Section
3:10), 4) display
the number of overrun
occurrences (Section
1
.1
.1), and 5) display
PROM version
and revision number. Table
1.6-
1
describes what the values
seen
in
the *B
Mode
represent. The correct signatures
of
the
21X PROMs are listed
in
Appendix
B.
A
signature
is
a number which
is a
function of
the data and the sequence of
data in memory.
It is
derived using an algorithm which assures
a
99.998%
probability
that
if
either the data or
its
sequence changes, the signature
changes.
The
signature
of
the program memory is used to
determine
if
the program tables have been
altered.
During the self check
on power-up, the
signature computed for
a PROM
is
compared
with a signature
stored
in
the PROM to
determine
if
a
failure has
occurred.
The
algorithm used to calculate
the signature
is
described
in
Appendix
C.
The contents
of
windows 8 and
9, PROM
version and
version revision, are helpful
in
determining
what PROM is
in
the datalogger.
Over the years, several different PROM versions
have been released, each with operational
differences. When calling Campbell Scientific
for datalogger assistance, please have
these
two numbers available.
TABLE 1.6-1. Description of *B Mode
Data
Key
Display
Entry
lD:
Data
"B
0't: XXXXX
02: XXXXX
03: XXXXX
Description of
Data
Program memory
Signature. The value
is
dependent upon the
programming entered and
memory
allotment.
lf
the
Tables have not been
previously compiled, they
will
be
compiled and
run.
First PROM Signature
Second PROM Signature
A
1-6
05: XXXXX
06: XXXXX
07: XXXXX
Third PROM Signature
Memory status, decimal
equivalent to
the
1s
and
shown on power-up
(Section 1.5.1
e.9.,
11111111=255)
No.
of E08 occurrences
(Key in
88
to reset)
No. of overrun occu
(Key in
88
to reset)
08:
X.XXXX
PROM
version number
09:XXXX.
Versionrevision
1.7
*C
MODE..
SECURITY
The *C Mode is used to secure the user's
program
information.
lf security
is
activated,
then the 21X will block keyboard access to the
*1,*2,
*3, *4,
and
*A
Modes.
Activated security
willalso
block Telecommunications access to
the *1, *2, *3, *4, *5, and *D Modes and the
Telecommunications C
command.
A
four digit
password allows entry to the
*C Mode and
becomes part
of
the program memory,
the program signature.lf security is enabled
when
*C is keyed, the password must be keyed
in before one can advance to
window
1.
lf
security is disabled, keying *C brings
up
window
1
immediately.
In
window
1
a
command can
be
entered to either enter
a new password (1), or
temporarily disable security (00) in order
to
check or alter
the programming. The password
on power-up
is
0000 (unless "D
was used to
create
a
custom PROM with the password built
in), which disables
security.
When security
is
temporarily disabled, it is possible to enter
all
modes and
to alter programming. Keying *0 or
*6
will automatically re-enable security, unless
the password
is
0000.
Entering the
4
digit password as an indexed
value (i.e. xxxx--, entered by keying C
after
entering the
four digits) blocks access to the
*1,
*2, *3, *4, and *A Modes, but
it
will allow the
user to view and change
the password.
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