US Robotics USR-310 User manual

ORIGINATE
THEORY OF
U.S. ROBOTICS» INC.
F.O. BOX S502
CHICAGO,s ILLINOIS 60480
(312)-528-9045
USR-310
ACOUSTIC COUPLER
OPERATIONS MANUAL

FAGE
GENERAL INFORMATION
Modems
are
used
for
transmitting
disdital
data
(such
as
from
a
comeuter
or
terminal)
over
analogs
channels
(such
as
the
telerhone
network)
a6
shown
in
figure
1.
The
modem
from
which
a
call
is
beinst
welaced
is
said
to
be
working
in
the
oridinate
mode.
The
modem
which
answers
the
call
is
said
to
be
in
the
answer
mode.
A
modem
in
the
originate
mode
transmits
#
losdicsal
1
or
"mark"
as
a
freauency
of
L270Hey
and
@
losical
O
or
“srace"
as
a
freauency
of
1LO70H=.
Simultaneously»
the
originate
modem
receives
sigmals
from
the
answer
modems
treating
2a
freauency
of
2225He
as
a
mark
and
2025H2
as
a
srace.
Turing
eeriods
when
either
modem
is
mot
actively
transmitting
datay
it
sends
a
constant
mark.
If
data
is
being
sent
simultaneously
im
both
directions:
2
sustem
is
said
to be
"full-durlex".
If
data
is
sent
in
only
one
direction
at
a
time
a
system
is
“halfenurlex".
In
many
cases,
full<-durelex
means
that
when
a
terminal
is
linked
to
2
commuters
the
comruter
echoes
back
what
the
rerson
at
the
terminal
is
turing.
Likewise,
half-duelex
usually
means
that
the
terminal
itself
echoes
back
what
the
rerson
at
the
terminal
is
turing
and the
comruter
doesn’t,
The
USR-310
has
a
half/full
durlex
switch
which
can
be
used
to
echo
back
what
vou
tyre
if
your
earticular
terminal
carmot.
If
vou
gre
signed
on
to
a
half-durlex
system
and
your
terminal
or
modem
is
im
the
full-durlex
eositions
vou
will
mot
see
what
vou
ture.
If
you
are
signed
on
to
a
full-durelex
system
anid
your
terminal
or
modem
is
in
the
half-durelex
moder
you
will
see
everything
vou
ture
erinted
twice,
TERMINAL
MODEM
TELEFHONE
LINE
«—AMOnEMK—ACOMFUTER]
FIGURE 1
Le

PAGE 2+
INTERFACE TO THE TERMINAL DEVICE
The
USR-310
connects
to
the
comruter
or
terminal
via
the
25
Pin
RS-232C
female
conmmector
om
the
case-hackranel,
If
gour
device
does
not
have
a
25
rein
RS-232C
connector
consult
the
manufacturer
of
the
devicer
Arrendix
By
and/or
U.S.
Robotics
for
further
hook
ur
informations,
OF ERATION
To orerate the USR-310?
1. Plus the 25 ein commector from your terminal or other device
. into the recertacle on the USR-310 baeckranel,
2e Select the arrrorriate half or full duelex setting.
3. Turn on the USR-310 and your terminal or other device.
4, lial the arrrorriate telerhone rmumber and listen for 2
hisgh-ritehed toner then insert the telerhone handset
into the rubber curs on tor of the USkF-310. The "cord®
end of the handset should be on the left a5 sou face
the USR-310 front eanel, (For best resultss insert the
handset into one cur firsty then feull gently in the ‘
direction of the other cur and insert the other end of
the handset . For removals move the handset sently
toward the end of the modem with the half/full durelex
Switch and remove the handset from one cur firsts then
the other. Removal is made easier if one gently fries
the wall of the rubber cur away from the handset so 3s
to remove any vacuum created by the insertion of the
handset into the curs. These techniaues work hetter
than trying to force the handset into or out of both
curs simultaneously,
5S. The communications link is now established and vou’re ready
to send and receive data.
6» To end the sessions remove the handset and hans ur the
telerhone. It is recommended thet the USF-310 be turned off
whenever it is mot in use.
NOTE? The USR-310 has an adiuustable transmit level which
can be used to make the tone sent from the sreaker Louder
or softer. This level has been set at the factory to serve
the widest mumber of arrlicationss howevery if wou =
experience difficulties in reliable communications adjusting
the transmit level’ may hele. The adJiustment is accessible
from a hole in the baserlate on the bottom of the case. A
few suidelines may be of helr3
If the modem om the other end of your transmission
link does mot hear your carriery or receives data
imerorerlyy you may want to make your USR-310 transmit
louder,
If the USR-310 is having difficulty receiving data
Prorerly, you will want to make your transmit level
softer. :

rh
PAGE 3.
AFFENTDIX B
DEFINITION
OF
FINS
ON
EIA
RS-232C
25
FIN
CONNECTOR
Protective
grounds
this
rin
is
hardwired
to
earth
ground
within
the
modem.
Transmit
dateay
data
to
be
transmitted
by
the modem.
-3
to
~-25
volts
for
a
losical
ly
+3
to
+25
volts
for
@
logical
Oo.
Received
data,
dats
received
from
the
other
modems
-12
volts
for
alostical
iy
+12
volts
for
a
logical
Oo,
Carrier
detect
(clear
to
send)»
rositive
level
when
detecting
Ba cerrier from other modem,
Tata set ready,
Signal grounds same as rin 1.
Clear to sendy same as rin 5S.

WARRANTY
COVERAGE
AND
SERVICING
ARRANGEMENTS
FEEEEEET
EE
EEEEE
EE
EEE
ETE
TE
EEE
EET
EEE
EEE
ET
EEEEEEE
EEE
EEE
EEE
EEE
WARRANTY
U.S. Roboticsy Inc. warrants to the original Purchaser
that it shall either rerair or rerlace (at its ortion)
this rroduct if it should rrove defective in material or
+ +
+ +
+
+
+ +
+ +
+ +
+ workmanshire under normal orerating conditions within 90 +
+ days from date of original eurchase. This warranty is +
++
+ +
+ +
+ +
+ +
+ +
+ +
void if the product is modifieds tamrered withs misused
or subJected to abnormal working conditions.
This warranty stands int. liew of all other warranties
either empress: imrlied or statutory.
FEEEEEEEEEEEEEEEEEEEEEEEEEEEEEETEEPEPE Ett tte tt tt ttt ett tt tt
SERVICING ~
In al1 the following cases, U.S. Robotics will ray for one way
shirerind chardes to the purchaser. If the malfunctioning rroduct
is a modem-data courler combinations then hoth modem and data
courler must be returned to U.S. Robotics.
Annual Maintenance Fackase
Anse
acoustic
courlers
modem,
data
courlery
or
modem-data
courler
combination
purchased
from
U.S.
Robotics
may
be
relaced
under
2
maintenance
agreement
for
a
fee
of
$25.00
rer
year.
Under
this
adreementy
U.S.
Robotics
will
rerair
the
rroduct
at
no
additional
charse
to
the
wurchaser
should
it
rrove
defective
under
normal
oreratingd
conditions.
If the purchaser elects not to subscribe to the Annual
Maintenance
Packase
before
the
expiration
of
the
90
day
warranty
reriod
and
subseauently
wishes
to
subscribe,
or
if
the
rurchaser
elects
mot
to
resubscribe
to
an
existing
Anmual
Maintenance
Packade
agreement
before
its
expiration
and
subseauvently
wishes
to
resubseribery
then
the
rurchaser
must
shir
the
rroduct
to
be
covered
to U.S.
Robotics»
Inc.
for
am
evaluation
and
certification
that
the
unit
is
in
good
working
order»
If
the
rroduct
is
functioning
imerorerly
or
is
inoperativer
it
shall
be
repaired.
The
fee
for
the
necessary
rerair
and
certification
service
is
$30.00
in
addition
to
the
$25.00
Annual
Maintenance
Package fee.
Froducts mot covered by the Annual Maintenance Fackade will be
serviced on a $30.00 rer rerair basis.

Express Rerair Service
For
eurchasers
who
have
established
credit
with
U.S.
Robotics,
we
offer
an
Express
Repair
Service.
Under
this
rlanry
we
will
shir
@
rerlacement
acoustic
courler,
modemy
date
courler,
or
nodem-data
coupler
combination
via air
freight
the
same
day
we
ere
notified
of
the
rurchaser’s
rroduct
failure.
The
Furchaser
must
shir
the
inorerative
rroduct
to U.S.
Roboties
within
three
days
of
the
Product failure
notification.
The
exchanse
shall
be
rermanent
unless
the
purchaser
reauests
that
the
original
Product
be
returnedy
in
which
case
the
original
rroduct
and
the
U.S.
Robotics
rerlacement
rroduct
shall
be
exchanged
uron
rerair
of
the
rurchaser’s
orisinal
product.
Under
the
Express
Rerair
Service
aortions
the
Annual
Maintenance
Fackase
fee
is
$35.00
and
rroducts
mot
covered
by
the
Fackade
will
be
serviced
on
a
$40.00
eer
reragir
basis.
Any
acoustic
courlery
modem
or
data
courler
which
has
been
modified
in
anv way
be
the
rurchasers
or
has
been
subjected
to
shnormal
orerating
conditions
or
abuse
will
not
be
serviced
under
any
of
the
plans
listed
ahove.
Insteady such
product
may
be
serviced
at
the
rate of
$25.00
rer
hour
for
labor
elus
Farts
_
costs,
In
all
cases
of
product
failurey
contact
U.S.
Robotics
for
shirring
instructions
to
the
arrrorriate
servicing
center.
Fees
subJect
to
change
without
motice
after
1978,