Campbell Scientific CR10 CR10 Measurement and Control - Page 65

SECTION

4.

EXTERNAL STORAGE PERIPHERALS

l(cy

*8

Display

ID:DATA

08:00

01:XX

02:XXXXX

03:XXXXX

04:00

TABLE

4.2-1.

*8

Mode

Entries

Description

Key

1

or

2

for

Storage

Area.

(This

window

is skipped if no memory has

been allocated

to FinalStorage

Area 2.)

Key in

Output

Device

Option.

See Table 4.1-1.

Start of

dump

location.

lnitially the

TPTR,

SPTR

or

PPTR location;

a

different location may be

entered

if

desired.

End of

dump

location.

lnitially

the

DSP location; a different location may

be

keyed in

if

desired.

Ready

to

dump.

To

initiate

dump,

key

any

number,

then

A'

While

dumping,

"04"

will

be

displayed

in

the

lD

field

and

the

location number

in

the

Data

field.

The

location number

will

stop incrementing when

the

dump

is

complete.

(Any key aborts

transmission

after completion

of

the

current data block.)

A

A

A

A

4.2

MANUALLY INITIATED DATA

OUTPUT.

*8

MODE

Data transfer to a peripheral device

can

be

manually initiated

in

the

*8

Mode.

This

process

requires that

the

user have access to

the

CR10

through

a

terminal

or

the

Campbell Scientific

Keyboard/Display. The

*8

Mode allows the user

to

retrieve a specific block of data, on demand,

regardless of whether

or

not

the

CR10

is

programmed for on-line data output.

lf external

storage peripherals

(cassette,

Storage Module, etc.)

are

not left on-line, the

maximum

time

between site

visitations

and data

retrieval must be calculated to ensure that data

placed in Final Storage

are

not lost due to write-

over.

In

order

to

make this

calculation,

users

must

determine:

(1)

how

large

their

Final

Storage is, (2) how many Output

Arrays

are

being generated, (3)

how

many low and/or high

resolution

data

points

are

included per Output

Array,

and

(4)

the

rate at which Output Arrays

are

placed

into

FinalStorage.

When calculating

the

number of

data

points per Output Array,

remember to

add

1

overhead

data point

(2

bytes) per array for the Output

Array

lD.

For example, assume that

29900

locations are

assigned

to

Final

Storage

(*A Mode), and

that

1

Output Array,

containingthe

Aray

lD

(1 memory

location),

g

low resolution

data

points (9 memory

locations) and

5

high resolution data points (10

memory locations), is stored

each

hour.

In

addition, an Output Array with the

Array

lD and

5

high resolution

data points

(11 memory locations)

is

stored

daily.

This

is

a

total

of 491 memory

locations per

day

((20

x2$

+

11).

29900 divided

by 491

=

60.90

days.

Therefore, the GR10 would

have to be visited every 60 days

to

retrieve data,

because write-over

would

begin on the 61st day.

Most likely

the

user would want

to

retrieve data

more often than this

to pedorm a

general

checkout

of

the station.

'

The output device

codes

used with the

"8

Mode

are the same as

those

used

with

Instruction 96

(Table 4.1-1), with

the

exception of

"alldata

to

tape"

(09, with

*8

all data between

the

start and

stop locations

is

always written) and the options

to

transfer

data

from

one Final Storage area

to

the

other

(80,

81).

Table 4.2-1

lists

the

keystrokes required

to

initiate

a

*8

data dump.

4.3

CASSETTE TAPE

OPTION

The

Model RC35 Cassette

Tape

Recorder

or

equivalent

can be

left attached to the CR10

for

.

continuous on-line

data

recording

or

it

can

be

periodically taken to

the

CR10 site for the

manually initiated retrieval

of

the

data

accumulated

in

FinalStorage.

The

*8

Mode

is

used

to

manually initiate tape transfer.

4.3.1

CASSETTE

RECORDER

The

RC35 Cassette Recorder

otfered

by

Campbell Scientific is

an inexpensive

recorder

for use with the

CR10

(also compatible with

the

21X and CR7

dataloggers). The

record/playback

function

of

each

RC35

is

tested

along

with a

head alignment procedure prior to

shipment.

CR10/RC35

connections are

made

with

the

SC92A Cassette

Write Only

Interface

or

the

SC93A

Cassette

ReadMrite

Interface.

The

CR10 controls

the

on/off state of

the

RC35

by switching power through

the

DC power line

of

the

SC92A/SC93A.

4-3

Campbell Scientific CR10 CR10 Measurement and Control - Page 65

Manually Initiated Data, Cassette Tape

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