Campbell Scientific CR10 CR10 Measurement and Control - Page 48

SECTION

2.

INTERNAL DATA

STORAGE

Output Processing Instructions store

data

into

Final Storage only when the

Output

Flag

is

set.

The string of data stored each time the Output

Flag

is

set

is

called

an OUTPUT

ARRAY.

The

first data point

in

the

output array

is

a

3

digit

OUTPUT

ARRAY

lD.

This lD

number is set

in

one

of

two ways:

1.

In

the default condition,

the

lD consists

of

the

program

table

number and

the

Instruction Location Number

of

the

instruction which set the

Output

Flag

for

that

particular

array

of

data.

For example,

the

lD

of

1

18

in

Figure 2.1-2 indicates

that

the

18th instruction

in

Table

1

set

the

Output Flag.

2.

The output

array

lD

can

be set

by

the

user

with

the

second parameter

of

Instruction 80

(Section

1

1).

The

lD

can

be set to any

positive integer

up

to

511.

This

option

allows

the

user

to

make

the

output

array

lD

independent of

the programming. The

program

can

be

changed

(instructions

added

or

deleted) without changing

the

output

array

lD.

This avoids confusion

during

data

reduction, especially

on

long

term

projects

where

program changes or

updates are likely.

[-PROGRAM

TABLE

NUMBER

I f-

LOCATION NUMBER

0F

THE

INSTRUCTION

WHICH

I I

SET THE

OUTPUT

FIAG

FOR THIS

ARRAY

L]

01+0118

lT-

|

-

DATA

PoINT

DATA

POINT

ID

FIGURE

2.1-2. Output Array

lD

NOTE:

lf

Instruction

80

is used

to

designate the active Final Storage

Area

and

parameter

2

is

0, the output

array lD

is

determined by the position

of

lnstruction 80

or by the position

of

the

instruction setting

the

Output

Flag, whichever occurs

last.

A start-of-array marker ($

in

Figure

2.1-1)

is

written into Final Storage with the Output

Array

lD.

This

marker is used as

a

reference point

from which

to

number the data points

of

the

output

array.

The

start

ol

array marker occupies

the

same

Final Storage location as the

Array

lD

and

is

transparent for all user operations.

2-2

Data are stored in Final Storage before being

transmitted to an

externaldevice.

There are

5

pointers for

each

Final Storage Area which are

used

to

keep

track

of data

transmission.

These

pointers

are:

1.

Display Pointer (DPTR)

2..

Tape

Pointer (TPTR)

3.

Printer Pointer (PPTR)

4.

Telecommunications

(Modem) Pointer

(

5.

Storage Module Pointer (SPTR)

The

DPTR is used

to

recall data to

the

keyboa

display.

The positioning

of

this

pointer and data

recallare

controlled from

the

keyboard

(.7

The

TPTR

is used to control data transmission

to'a

cassette

tape recorder.

When on-line tape

transfer

is

activated (lnstruction 96, option

00),

data

is

transmitted to tape whenever

the

DSP

is

a

minimum

ol512

memory locations ahead of

the

TPTR.

The

TPTR

may also be positioned

via

the

keyboard

for

manually initiated data

transfer to

tape

(.8

Mode).

The

PPTR is used to

controldata

transmission

to

a

printer or other serial

device.

Whenever

on-line printer

transfer

is activated (lnstruction

96), data between

the

PPTR and DSP are

transmitted. The

PPTR may also be positioned

via

the

keyboard

for

manually initiated data

transmission

(*8 Mode).

The

MPTR is used

in

transmitting

data over

a

telecommunications

interface.

When

telecommunications

is

first

entered,

the

MPTR

set to

the

same location as

the

DSP.

of

the

MPTR

is

then

controlled

by

commands

the

externalcalling

device (Section 5.1).

The

SPTR is used to

control

data transmission

Storage

Module.

When on-line

transfer

is

by Instruction 96,

data

is

transmitted each time

output array

is

stored in Final

Storage

lF THE

STORAGE MODULE

IS

CONNECTED TO THE

CR10.

lf

the Storage Module is

not

connected,

CRlO does

not

transmit the

data

nor

does

it

the SPTR to

the

new DSP

location.

lt saves the

untilthe

Storage Module

is

connected.

Then,

d

the

next execution

of

lnstruction 96,

the

CR10

outputs

allot

the data between the SPTR and

DSP and updates the SPTR to

the

DSP location

(Section 4.1)

The

SPTR may also be positioned via the

keyboard

for

manually initiated data transfer

to

the Storage Module (*8 Mode, Section 3.2.3).

Campbell Scientific CR10 CR10 Measurement and Control - Page 48

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