Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 55)

used to

the 21X that

a

a

a

a

a

radio

short

modem

SC32A

ribbon

cable

inbrtace and

coax cable

does not cover

the technical

inbrtace details for any

of

these

links. Those

details

Section 6 and

in

the

individual manuals

for

the devices.

Data retrievSl

can

take

place

in either

ASCII or BINARY.

The

BINARY format

is five times

more

compact th41

ASCll. The shorter

transmission

times

for

binary

result in lower

long

distance

telephone

charges and

more

reliable data transfer.

On "noisy"

links

shofter

blocks of

data are

SECTION

5.

TELECOMMUNICATIONS

allows

a

computer

to retrieve data directly

from Final Storage and

may be

the 21X and monitor

sensor

readings

in realtime.

Any user communication

with

use of

a computer

or terminal

instead of the

21X keyboard

is

through

can take

place

over

a variety of

links including:

more efficient

data transfer,

binary

data

retrieval makes use

of a

signature for

error

signature

algorithm

assures a

99.998%

probability

that if either

the data or

its

the

signature

changes.

This section

are

covered

ln addition

detection.

sequence

The PC208

Support Software

for PCs and compatibles

contains

the

program

TELCOM

automates

data retrieval and

TEBM

which will upload and

download

programs

and monitorltlnput

Storage.

The PC208

package

has

been designed to

meet the most

common

needs in

dalalogger support

and

telecommunications.

This section

in not

intended to

furnish

sufficient

ddait

to write Telecommunications

software.

Appendix

C contains

some details

of

binary data

Vansfer

and

Campbell

Scientitic's

binary

data tormat.

This

sectiorl

emphasizes

the commands

that

a

person

would use

when manually

(i.e.,

entered by

hand) interrpgating

or

programming

the

21X via a computer/terminal.

These

commands

and

the

responses

tl tnem

are sent

in

the

American Standard

Code

for

Information lnterchange

(ASCll).

The RemotQ

Keyboard

State

(Section 5.2)

allows

the

user with

a computer/terminal

to use

the

same comnlands

as the

21X keyboard.

5.1

TELECOMMUNICATIONS

COMMANDS

When

the

211X

is rung by

a

modem, it answers

(enables

the

modem) almost

immediately.

Several

carfiage

returns

(CR)

must be

sent from

the computQr

to allow

the

21X to set

its baud

rate

to

that

Ff

the modem/terminal

(300, 1200,

9600, or

761800). Once

the

baud

rate is set, the

21X sends

fhe

prompt,

*,

signaling

that

it

is

ready to

receive a

command.

GENERAL

RULES

governing

the

telecommu

nications

commands

are:

1.

*

from datalogger

means

"ready

for

command",

2.

Allcommands

are

of

the

form:

[no.]letter,

where the

number

may or

may not be

optional.

3.

Valid characters

are the

numbers 0-9,

the

capital

letters

A-L,

the

colon

(:),

and the

carriage

return

(CR).

4, An illegal character

increments a counter

and

zeros the command

buffer,

returning

*

5-1

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