Campbell 21X Manual do Operador descarregar pdf (Página 165)

APPENDIX

ASCII:

for American Standard

Code

fo I nformation

Interchange

"askee").

A specific binary

code

of 28

characters

represented by 7 bit

binary

BAUD RATE:

The speed

of transmission of

informatibn

across

a serial

interface,

express{d

in units of bits

per

second.

For

examplef

9600

baud

refers to bits being

transmittpd

(or

received)

from

one

piece

of

equipmefrt

to another

at a

rate

of

9600 bits

per

secofrd.

Thus, a

7 bit ASCII character

plus parify

bit

plus

1 stop bit

(total

9 bits)

would

bd transmitted

in 9i9600

s€c.

=

.94ms

od about

1000 characters/sec.

When

communicating

via a serial

interface, the

baud

ratp settings

of two

pieces

of

equipment

must

match each other.

DATA POINT:

A data

value which is sent to

Final

Stdrage

as the

result of

an

Output

InstructiQn.

Strings

of data

points

output

at

the samQ

time

make up

Output Arrays.

INTERVAL:

The

time

interval

initiating each

execution of a

table.

The execution interval

will

with the current 24

hour

that the

table is executed

at

and

every execution

interval

the

The table

will be executed

for

the

first

at the

first occurrence of

the

interval

after compilation.

Any

time the

is reset the

execution

interual

is resyn$hronized.

See Section

1.1 for

information

on the

choice

of

an execution

interval.

EXECUTIO$

TIME:

The time

that it actually

takes thb

21X to

execute

an instruction or

group

of

instructions.

lf the execution

time

of

a

pro$ram

table

exceeds the table's

executidn

interual,

the

program

table

will be

executed

less frequently

than

programmed.

A. GLOSSARY

FINAL

STORAGE: That

portion

of

memory

allocated

for storing Output

Arrays.

Final

Storage may be

viewed as

a ring memory,

with the newest data

being

written over the

oldest.

Data in FinalStorage

may be

displayed using the

*7

Mode

or sent to

various

peripherals (Section

2).

HIGH

RESOLUTION: A

high resolution data

value has 5 significant

digits

and

may

range

in magnitude from +.00001

to *99999.

A

high resolution data

value requires

2 Final

Storage locations

(4

bytes).

All Input

and

Intermediate

Storage

locations are

high

resolution. Output to

Final Storage

defaults

to

low

resolution;

high

resolution output

must be specified

by Instruction

78.

INDEXED INPUT

LOCATION:

An input

location

entered as

an instruction

parameter

may

be

indexed by

keying

"C"

before

entering by keying

"A";two dashes

(--)

will

appear at the

right of the

display.

Within

a

loop

(lnstruction

87, Section

7),

this will

cause

the

location

to be incremented each

pass

through the

loop.

Indexing is also

used with

Instruction

75

to

cause an input

location,

which

normally

remains constant,

to

be

incremented

with each

repetition.

INPUT/OUTPUT

INSTRUCTIONS:

Input/Output instructions

are used

to initiate

measurements and store

the

results

in

lnput

Storage

or to

set Digital

Control Ports

or Continuous

Analog Output

channels.

INPUT

STORAGE:

That

portion

of memory

allocated for storing

the

results of

Input

and

Processing instructions.

The values in

Input

Storage

can be

displayed

and

altered

from the

*6

Mode.

INSTRUCTION

LOCATION

NUMBER:

As

instructions are

entered

in a

program

table,

they are

numbered sequentially.

The

instruction location

number

is the

number

giving

an

instruction's

order

in the

program

table. When

programming

a table, the

instruction location

number

and a P

(e.9.,

04: P00)

prompts

the

user

when it

is time

to

enter an

instruction.

bes

time

A-1

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 190 191

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