High Speed Transmission; Parallel Interface - GE TermiNet 300 Programmer's Manual

HIGH SPEED
TRANSMISSION
One of the rate
posltlon:.; l:aL
i"t(
dl
rk
120 to
indicate the ability
tp
i.Lt))S1',);t
!.ape ;.u
r,'C
:\.~ate of
120 characters per second
!,
1
~~OO
}la.ud!,
All printing is inhibited during this operation and
the unit goes to the" Standby" condition.
PARALLEL INTERFACE
In the de sc ription be
10\\7 .
Logic"
1" is
more ne~::atlVt'
than
-1
(I \lOltS
and
a maximum negative volta~!,c oJ -27 volts.
L_ ,_
Logic "Oil is bf't\v('en "0" and ,. -1" volts.
voltage applied to this ulicrfaec
rnas
cause
serIOUS
equipn1ent dan1ag:e.
All outputs froln tile TermiNet
300
Printer will
have a source impedance of less than 2000 ohms.
Outputs from the TermiNet 300 Printer will be short-
circuit protected.
Definition of Signals
The au.xiliary device interface requirernents are
shown in Table
5~
The logic status of a barred sig-
nal is
T!
l'
t;
Ule logic status of
an
unba r red signal
is "0".
Sequence of
Operation
USASCII IhPUT:
AINH line should
be at ., O~ .
If the transparency switch is included on the
TermiNet 300 Printer, the switch position should be
OFF.
If printing is desired, all tin1ing characteristics
of the TerluiNet 300 Printer
l11USt
be satisfied.
The auxiliary device n1ay be turned ON by its
own local control or by receJvini!, fro111 the trans-
n1ission line t~ ESC K" or
I l
ESC k". I)evi~es 111ay
be turned off by loeal control or l"(,(:ClL:,'nizing!! ESC
L" or
T
j
ESC 1'!, 'This
nleans
the ESCL sequence \vill
have effect either
'when
received
frurn
the
trans--
mission line or when generated locally.
Closed-loop Operation
Auxiliary device data are presented to the Termi-
Net
300
Printer on input lines All through AI8.
Programmer's Manual GEK-15002
Upon presentation of the data, a strobe is to be
supplied from the alLxiliary device. (See GENERAL
NOTES. )
The Tern1iNet 300 Printer responds with ASTIN
\vhen it is ready fo r the next data characie r. Input
strobes to the TermiNet 300 Printer should occur
after the end of ASTIN.
Open-loop Operation
Auxiliary device data are presented to the Tern1i-
Net 300 Printer on input lines All through Al8.
Data n1ust be held for a rninirIlun1 tinle as speci-
fied in Table 5. The data rate must be less than the
trans111ission rate.
AINH line should be at
T'
I" . This logic affects the
TermiNet 300 Printer to inhibit printing and rec-
ognition of all control codes (either transmitted or
received), but punching will be allowed. Auxiliary
device ON and OFF codes will not be recognized.
The transparency switch, if included, should be in
the OFF position.
Either closed- or open-loop operation is the same
as with USASCII
Input.
Genera
I
Notes
MECHANICAL CONFIGURATION
Connector: Type D, 25-pin female
Cord Length: 6 feet
w1:en the auxiliary device is active no other data
input should be used: i.
c.,
keyboard, tape reader or
answerback.
If the auxiliary device is presenting 8 bits of data,
the strobe supplied
by
the device should go to
AISWIP. If the auxiliary device is presenting 7 bits
of data and wants the TermiNet 300 to add the 8th
bit as even parity, AISWOP should be used.
Any time a "Break" signal is received the ATOFF
lead will be energized.
Character rate will be determined by the RATE
SELECTOR switch on the front panel of the Tern1i-
Net 300 Printer.
The auxiliary device may provide a signal to the
TermiNet 300 Printer on lead AUXRDY. The Terlni-
Net 300 Printer will treat this the same as a TTpapcr
out" and the resetting must be in the auxiliary device.
17