Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 63)

data

to

also

disk

and

Card

modem,

when

implemented by

computer

To

the

limitations of

half

duplex,

some

links

expect

a terminal sending

the

data to

the screen.

This

saves the

device having to echo that

Campbell

Scientific device, characters

are

displayed

twice

(in pairs),

it is

likely that the

terminal

is sQt

to

half duplex

ralher than

the

correct

setting of

full

duplex.

IF

NOTHING HAPPENS

lf the 21X

is

connected

via

the

SC32A interface

to

a terminalior

computer

and

*

is not received

after sending

carriage

returns:

1.

Verify the 21X

has

power

and that

the

cables

ng the

devices

are securely

2.

Verify

terminal

rtions

port

configured

as

DTE

6.5-2).

The most common

occur

when the user

tries

to

use a

parallel

address

,

or

doesn't

know the

port

(i.e.

COMI or COM2).

lBM,

and

most

come

with

a

Diagnostic

the

port

of the computer

or

an

asynchronous

serial

can

be

used to

identify

ports,

addresses.

lf the serial

port

is

equipment,

then

the operators

manual

give

you

this

information.

Some

SECTION 6. 9

PlN SERIAL

INPUT/OUTPUT'

configured

as DTE or

DCE with a

jumper

block.

Pin

functions must match

with

Table

6.5-1.

lf

you

are

using

a computer,

then a

program

or

communieation

software

must

be

used to

enable

the

serial

port,

and

to make

the computer

function as

a

terminal. The

port

should be

enabled

for 300, 1200, or 9600

baud, 8 data

bits, 1 stop bit,

and no

parity.

TERM

(PC208

Software)

provides

this function

for IBM

PC

IXT

I AT IPS-2's and

compatibles.

lf

you

are not sure that

your

computer or

terminal

is

sending

or

receiving characters,

there

is

a simple

way to verify it. Set the

duplex to

full. Next, take a

paper

clip

and connect

one

end to

pin

2, and the other

end

to

pin

3

of the

serial

por4.

Each character

typed on the

keyboard

will be

displayed

only

if transmitted

from

the

terminalon

pin

2, and

received on

pin

3

(with

half

duplex.the

character

will be displayed

once if

it is not transmitted, or twice

if it is

transmitted).

IF

GARBAGE

APPEARS

lf

garbage

characters

appear on the

modem/terminal,

check

that

the

modemlterminal's baud

rate

is

supported

by

the

21X. lf the baud

rate

is

correct,

verity

that the

modem/terminal is set for I

Data bits, and no

Parity. Garbage

will appear

if 7 Data

bits

and

no

Parity are used. lf the modem/terminal

is set

to

8 Data bits and even

or odd

Parity,

communication cannot be

established.

rial

ports

such as the Super

Serial

Apple computers,

can

be

6-5

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