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7.5.3

*C

MODE

-

SECURITY

The

*C

Mode

is

used to block access

to the

user's

program

information and certain CR500

functions.

There

are 3levels of security,

each

with its

own

4 digit

password.

Setting a

password

to

a non-zero value "locks"

the

functions

secured

at that

level.

The

password

must

subsequently

be entered to temporarily

unlock security

through that level. Passwords

are

paft

of the

program.

lf security is enabled

in

the active

program,

it is enabled as soon

as the

program

is run

when

the

CR500 is

powered

up.

When

security

is disabled,

*C

will advance

directly to the window

containing the first

password.

A non-zero

password

must

be

entered in order

to advance to the next window.

Leaving

a

password

0, or entering 0

for

the

password

disables

that and subsequent levels

of security.

Security may

be temporarily disabled by

entering a

password

in the

*C

Mode. The

password

entered

determines what operations

are unlocked

(e.9.,

entering

password

2

unlocks

the functions

secured by

passwords

2

and

3).

Password 1

(everything

unlocked)

must

be

entered before

any

passwords

can be altered.

When

security is temporarily disabled in

the

*C

Mode, entering

t0

will

automatically

re-enable

security to the

level determined by the

passwords

entered.

7.5.4

*D

MODE.

SAVE OR LOAD PROGRAM

The

*D

Mode

is used to save or load CR500

programs,

to

set the datalogger lD, and to

set

communication

to full or half duplex.

FroErams

(*1

,

*2, *3, *4, *A, *C,

and

*D

Mode

data)

may

be stored to and

from

computers,

internalflash

memory,

and

Storage Modules.

Severalprograms

can be stored in the CR500

Flash Memory

and

later recalled

and

run

using

the

*D

Mode

or lnstruction 111.

When

"*D"

is keyed in, the CR500 will display

"13100". A

command

(Table

7.5-41is

entered

by keying the

command number and "A".

34

1

2

2--

6

*1"--"

7

7N

I

9

TABLE

7.5-4.

*D

Mode

Commands

Command

Description

Send

(Print)

ASCII Program

Load ASCII Program,

xQ

Load ASCII Program,

*$

Store Program

in Flash

Load Program

from Flash

Save/Load/Clear Program

Storage

Module N

Set

Datalogger lD

Set

Full/Half

lf

the CR500

program

has not been compiled

when the command

to save a

program

is

entered, it will

be compiled

before the

program

*is*Saved.

When

a

program

is loaded, it is

immediately compiled and run. When a

command

is complete, "13:0000" is displayed;

*D

must be entered

again before

another

command can

be

given.

TABLE 7.5-5.

Program

Load Error Codes

E

94

Program

Storage

Area

full

E 95

Program

does not

exist in flash

E 96 Storage Module not connected or

wrong

address

E97

E98

E99

Data

not encountered

within 30

Uncorrectable errors detected

of

file

or

Editor Error

lnternal

Flash

Program Storage

Several

programs

can be stored

in

the CR500

Flash Memory

and

later recalled and

run

using

the

*D

Mode. The Flash Electrically

Erasable

Programmable Read Only

Memory is non-

volatile memory

that can only

be erased in 16K

blocks. The CR500 has

128K of

Flash

EEPROM memory,

one

16K block

is

reserved

for

storing

extra

programs.

When a

program

is loaded and compiled,

it

is

saved as the

active

program.

The active

program

will

be automatically

loaded and

run

when the CR500

is

powered

up.

(lf

a Storage

Module

with

a

program

8 is connected

when

CR500

powers-up,

the Storage

Module

progra

8 will be

loaded

into the CR500 and become t

active

program.)

The active

program

can be

stored in internal

flash memory

program

storage

with

xD

command

6

(Table

7.5-6).

Programs

can be

retrieved with

*D

command

7

(Table

7.5-7).

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