Marantz 5220 Manuel d'utilisateur télécharger pdf (Page 46)

feed

a signal

into

the

second stage of

the filter.

To record

local

terminal data,

plug

the tape recorder's

microphone

input

into

and

set

the

TRANSMIT

switch

HIGH.

Run the recorder

and

input

data

from the

terminal.

To record

line

data, plug the record-

er's

microphone

or auxiliary input into

J2.

Run

the recorder for

the duration

the

desired

output. Record

5- second leader

-data carrier

the

tape

before the data.

play data

back to a local termi-

nal, plug

the

recorder's

speaker out-

put

into

J3.

Then play

the tape. The

modem will

track with

any

desired

speed variations

from the tape.

The

first

point

failure

for

speed

change

will

occur when the

timing

of the

sig-

nal into the

terminal goes

beyond the

limits

its

serial receiver

circuit.

play data back to

the line,

con-

nect

switch between

pins

and 3 of

the 25

-pin connector

on the modem

and pins 2

and 3

the terminal

shown in Fig.

3B. Using the terminal,

set up the proper

conditions in the

sys-

tem to receive the

data. Make

sure

that

you start the tape in

the no

-data carrier

leader

area.

Plug

the recorder

cable

into

the tape recorder

and throw the

switch to connect pins 2

and 3 of the

connector.

Plug the

other

end of

the

recorder

cable

into

J3.

Data

will now

feeding

into the modem's

receiver,

looping

back to the transmitter

sec-

tion.

Simultaneously,

the

data will

ap-

pear on the terminal.

Current -Loop

Hookup.

Tele-

printers

handle

data

on a

current

loop,

where 20 mA

current repre-

sents a 1

"mark"

and no

current

represents

a 0

"space."

The

wiring

between

the modem

and

Model

Teletype

(TTY)

are shown in Fig.

3C. If

you

have

older

teleprinter

that has

bare

coils, use a reed relay

between

pins 23

and 7 (ground)

on the modem.

Connect

a diode

between

pin 23

and

ground,

with the

cathode

going to

23. This

diode

will prevent

inductive

"kickback" voltages

from

damaging

current

-source

transistor Q2 inside

the modem.

Teleprinter

keyboards

consist

switches that

open

and close

accord-

ing

a set pattern to

control

an exter-

nally

supplied

current.

of the

modem

a source

maximum

current.

Connect pin 11

and the teleprinter

keyboard

from

13 to

EIA Interface.

The

EIA

standard

relevant

to the modem is

RS232C.

Any

terminal

wired

according to this

specification

will mate with

the Pen -

nywhistle

modem.

EIA

signals in the RS232C

standard

are

always more

than

volts

amplitude

and

always less than 25

volts

open circuit (15 volts

when

con-

nected).

They

are

positive or negative,

depending

on the

data. Negative is

data 1 (mark),

positive

a data 0 (space).

Control

lines

are active with

a positive

signal. EIA

signals

are

not

required

drive

a load

less

than

3000

ohms,

but they must

be protected from

ground

and each

other.

Final

Remark. To

communicate

between two Pennywhistle

modems,

the TRANSMIT

switch must

be set to

Low

for

receiving,

HIGH for

trans-

mitting. Keep

the

DUPLEX

switch

the

FULL position,

and

your

receiver will

come back with

what

you're

transmit-

ting. Bear in

mind that

communication

can be in

only one direction

when

using this

scheme.

3 GOOD REASONS

FOR BUYING AN

EMPIRE

CARTRIDGE

1. YOUR RECORDS

WILL

LAST

LONGER.

Unlike

ordi-

nary magnetic

cartridges,

Empire's variable

reluctance

cartridges

have

a diamond

stylus

that floats free

of its

magnets.This imposes

much

less weight

on the

record

surface and

insures much

longer

record life.

YOUR RECORDS

WILL

SOUND BETTER.

Empire

sound

spectacular.

Distortion

at standard

groove

velocity

does

not exceed

.05 %. Instruments don't

waver; channel separation

is razor

sharp.

CIRCLE NO.

20 ON

FREE INFORMATION

CARO

CARTRIDGE

FOR

YOUR MONEY. We

use

4 poles, 4

coils and

three mag-

nets in

our cartridge (more

than

any other brand).

Each

cartridge

must pass rigid

tests

before shipment.

For more

good

reasons

to buy

Empire

cartridge

write

for

your free

catalogue:

EMPIRE

SCIENTIFIC

CORP.,

Dept. Z,

Garden

City,

N.Y. 11530.

POPULAR

ELECTRONICS

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Marantz 5220 Manuel d'utilisateur Page 46

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