Campbell 21X Manuel de l'opérateur télécharger pdf (Page 32)

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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