Datapoint 3300 Руководство по эксплуатации - Страница 13

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INTERFACE SPECIFICATION
TYPE:
EIA
RS-232-B
SIGNAL
CHARACTERISTICS:
1.
RECE
IVE
a. MAR K
.....
......
-3
to
-
25 vo
lts
b.
SPACE
...
..
..
....
+3
to +25
volts
2.
TR
ANSM
IT
a.
MAR K
.....
...
-
10 Vo lts wit
h
3K Load
b. SPACE .. .... ..
+6 Volts w
ith
3K
Load
Max
imum Short
Circu
it
Current .....
.
500
MA
T er
m
inati
ng Impedan
ce
....
..
..
......
... 3K TO
7K
Con
nect
or
T
ype ....
....
..
...
..
......
....
.
17-
10250-
1
Amphe no
l
(or equiva lent)
PIN ASSIGNMENTS:
Pin
Function
1
...
.....
....
. Pr ot
ect
ive G
rou
nd
2
.......... ... Tran sm
itted
Data
3
..... ...
....
.
Rece
ive Data
4
..
.... ..... ..
Request
to
Send
7
.....
...
..
... Signal
Ground
8
..
...
...... ..
Data
Carrier
Detect or
11
...
...
..... ..
Reverse
Cha
nnel
Transm it
Data
12...
..........
Reve
rse
Cha nnel Rece ive
Data
18
...... ....
...
Read
On ly
Data
(See
Note)
20.............
Data
Term inal Ready
NOTE
The
data avai lab le at
pin
18
may
be used to
dr
ive a
rea
d
on
ly
copy
devi
ce
and
has
t he same
sig
nal
characterist
ics
as
the
normal transmitted
data. A
ll
data tran sm itted
and
re
ce
ived
ap-
pears at th
is
po int.
HIGH
SPEED OPERATION
OF
THE
DATA-
POINT 3300
When t
he
Da
ta po
int 3300
is operated
at baud
rates
above 300, a
202
type
data set
or
equ
iva
-
10
lent
data set
or coup ler must be used
.
The
most
co
mmo
n high
speed
b it rate
to
be
supported
by
most
T
imeshar ing operations is
1200
baud;
however
,
t
o operate above
600
baud, t
he Data-
po
int
3300
must
be equ ipped
w
ith t
he opt
io
nal
"Speed Buffer"
. Th
e Datapo int
3300 is
de-
signed
to
o
perat
e
w
ith
a data
set hav
ing
a
re-
ve rse
chan nel. A
t t
he higher baud rates
the
sys-
tem
operat
ion
is
half
du
p
lex. Set
t
he
dup
lex
sw
itch to
FU
L
L (Th
e
202
has
it
s
own
Feedback
Path) and se
lect the
pr
oper
baud
rate o
n
the rear
panel.
T
he use of t he rever
se
cha nne
l
makes
it
poss
ible for
the
computer or the
te
rm inal
to
initiate a
chann
el
reversa
l.
The Da
t
apo
int 3300
is
ready
to
operate
w ith th
e
high
speed
modem
as
it
comes
from t he fa ctory
.
Th
e
o
nl
y operat
ional
differences
w
it
h
respect
to
the
ter
m ina l's use
with the
103 type data
set
or
coup ler,
are as fo
ll
ows w
hen
co
ntact
is
esta
b lished
w
ith
t he computer
in
the norma
l
manner
,
the
computer
w
il
l immed
iate ly
initiate
a
cha
nnel
tu
rn
arou nd, t hus, giv
in
g it th
e
co n-
tr
ol
of the cha
nn
el.
When
th
e
computer
has
fin
ished
its
t
ransm
iss io n, it
w
il
l
in itiate the
channel turn arou
nd
giv
ing
t
he
t ermin
al
co
ntro
l.
Co ntro
l
of
th
e
cha
nnel,
or the device that is
transm
itt
ing,
is
in
d
icated
by
t he
li
ght
in
t
he
LOCAL/R
EMOT
E sw itch on the Datapoi nt
3300.
When
th
e
term
inal
has
contro
l, the
light
w
ill
be
i
llu
mi
nated
and
w
hen the
co
mputer has
co
ntro l, the light
w
ill
be
extingu ished. Norma l-
ly,
the co
mputer w
il
l
ini
t
iate
all channel
tu
rn
arou
nds; however
,
the
operator of
t
he
te rm ina
l
may init iate
a chan
nel
turn
aro
und
by
depress-
ing, mome nta
r
i ly,
t
he BREAK key. T erm
inal
co
ntro
l of
the cha
nn el
may
also
be
relin-
qu
ished by
sw
itch ing t he LOCAL/REMO
T
E
sw
itch
from REMO
TE
to LOCAL
and
ba ck to
R
EMOT
E.
It
is
importa nt that t he
operator
wa
it unt
il
the
li
ght
in
the
LOCAL/REMOTE
sw
itch
is
ill
uminated
before
any
key
other
th an the BR EAK key
is
dep
ressed
.
W ith the
above
except io
n, the
operat ion of
the term ina
ls
at
the
higher
data
rates
is
ident
ica
l
t
o its
low
speed
(300
baud
or less)
operat
ion.
~