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SECTION 9. INPUT/OUTPUT

INSTRUCTIONS

trigger when

measurement

goes

from above

the

limit

to below it

or when the

digital trigger

goes

from

high to low.

When triggering

on the rising

or falling

edge,

the input must

make the

specified

transition

to trigger. For example,

when triggering

on the

rising

edge, if

the input

starts out high,

it must

low

and then high

again to

trigger.

DATA

SENT TO

INPUT STORAGE

When the

measurements

are

sent

to Input

Storage,

Parameter

6 is

used

to specify the

number of

scans made

on the channels

being

measured

(the

21X

multiplies the number

entered by 1000).

The measurements

from

each channel

are stored contiguously.

For

example: Parameter

1 specifies

4 channels

are

be measured, Parameter

6 specifies 250

scans

(0.250

entered), and Parameter

specifies 1

as the first input location in which

store

data.

The measurements

from the first

channel

will

be stored in Input

locations 1-250,

those from

the second channel in locations

251-

500, etc.

lf insufficient

locations

are allocated

lnput Storage

(.A)

to accommodate the number

of locations called

for by Parameter 6 multiplied

by Parameter 1

(e.9.,

250 x4

1000), an error

code, E 60, will

displayed

when

the

program

is compiled.

The

number of

scans

determines

how many

samp,les will

be saved, and hence,

when

lnstruction 23

will be completed

and

execution

will

pass

on to the next instruction.

Measurements

before

and/or

after the trigger

can be saved. Parameter 7

determines how

many scans

that occurred

prior

to the trigger are

saved.

For

example

it 250

scans

are

specified,

and

offset

of 20 is entered for

Parameler 7,

then

the trigger measurement

will

stored in

Location 21

. Locations 1-20

will contain the

measurements

that

preceded

the trigger and 22-

250 willcontain

the

measurements

following

the

trigger. lf only

10 measurements

are

made

before the trigger,

then they will

stored

locations

11-20 while

the

value

-99999.

will

stored

locations

1-10 for which

measurements

were made.

DATA SENT

SERIAL

PORT

When the raw

A/D

data

sent out

the

serial

port,

the measurement

data is not

buffered and

hence, only

the trigger and

subsequent

measurements

can be sent. The

number of

measurements is

determined

Parameters

and 6.

Because

the total

number

measurements

are

limited

only by

the

storage

the receiving computer, this

can be

a very

large

number. Parameter

6 is the number

measurements

per

channel to send in units

1000

(e.9.,

0.001 represents

1 measurement).

lf 0 is

entered

for

Parameter 6,

the

21X will

continue to

send data untilthe instruotion is

aborted

with

the

key.

Raw A/D data may

sent

to up to 2 SM192 or

SM716

Solid

State Storage Modules

(SM)

76.9K

baud

(parameter

Destination Option

C=2). One SM

should

set as Fill

and

Stop

memory and the

other

set as Ring

memory.

Data

sent

will be

stored

in both

SM's

(in pa

untilthe

Filland

Stop

SM is full.

The

Fill and

Stop SM

willstore

data. The Ring SM

will

continuously store

data,

overwriting the

oldest data

when

full,

until Burst

measurements

end. When the Burst

measurements

end the Fi

and

Stop

SM willcontain the oldest data

generated

while

the Ring SM will contain the

newest.

the amount of data

generated

exceeds

the

capacity

of both

SM's only

the

oldest and newest data

will

be saved.

the

amount of

Burst

data

generated

is less then the

total capacity of both SM's,

pad

of the

data

stored will be stored in both SM's. lf the data is

retrieved from

the SM's

using

SMCOM.COM, a

Storage

Module

communications

program

contained

the PC208 Datalogger Support

Software, the data

collection

format must be

as stored

bit". This

will

transfer the

raw

A/D

data to

a computer

file.

The raw

A/D

data

can

converted

to ASCII using

SPLIT.COM, a

general purpose

data

reduction

program

also

contained in PC208.

SPLIT

is not

available

for

converting the raw

A,/D,

the

following

A/D format information is

provided

for

decoding

purposes.

At the start

and end of the series of measurements, the 21

makes a self-calibration measurement. The

calibration data is sent at the start and end of

the measurement data. The serialdata is sent

as a

series

of signed 2byle integers

(most

significant byte

sent first;

i.e., Integer

256

byte 1 + byte 2): 11...1n. The first integer, 1.,, is

start of output identifier, FCxx

(hex),

where

the

first

byte

is always

(never

seen in the data),

and

the

second

byte is

a number

less than 100

(decimal,

64 hex),

which

the instruction

9-10

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 190 191

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Campbell 21X Manuale dell'Operatore Pagina 103

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