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Figure
24.
111M
1715 Digital Display
U
nit
The Plus and Minus
lights
reflect the absence
or
presence of a flag over the digit transmitted to the
units position. A
II four digits must be addressed
when-
ever
the 1715 is
operated, starting
with the thousands
position and proceeding in
sequence
to the units posi-
tion
.
Address ing
the thousands position
p laces
the unit
in unit response
status; addressing
the units position
removes the unit from response
status.
The four digits
are
not displayed until the units position is
addressed
and
they remain displa yed until the unit
is
reset by
en-
tering
a
nother digit in the thousands position by the
program. Digits
sent to
the unit must not
co
ntain
a
flag bit, with the
except ion of
the digit
sent
to the units
position which uses the Hag bit to represent the
sign.
Check
Light. Each digit
sent
to the display unit is
checked
for
parity.
A
parity
error
in anyone digit
turns
the
Check light on,
resets the
four
display positions to
blank,
and
turns on the
SlOe
Output
Error
indicator
.
Power On
/
Off
Switch
.
This
sw itch
is used
to
control
electrical power to the unit. When power is
on,
either
the Plus
or
Minus
light
is
on.
Display
Lights.
The display lights may be
easily
re-
placed from the front panel.
IBM 171 7 Output Printer
The
IBM
1717 Output Printer is
ava
ilable
for
connec-
tion to the
IBM
1710 Con trol System through the 1716
Output Printer Control
and
Power Units
and
the
Serial
Input/Output Channel. It fills the need for
output
information from the 1710 Control System to remote
34
loca
tions
in
the
process where
it is most
vitally
needed
,
or
to
other locations such as
the
superintendent's office.
Description
The
IBM
1717 Output Printer is
a
modified mod
el
B
IBM
electric typewriter. The standard
ma chin
e
h
as a
12-inch
ca
rriage, medium platen,
and red and
bl ack
ribbon
shift. The standard
type is Manifold
No.
10,
which prints ten characters to the in ch.
The standard
character set
includes
A-Z,
0-9,
a
nd
the special characters
*
+
- =
,./
.6
All
alphabeti
c
characters
print
as capitals and a
ll
print-
ing
is done in
the lower-case
position,
so
that
carriage
sh ifting
is flat
required.
The
power
a
nd
co
ntrol circuits for the Output
Printer
are
co nta
ined in the
IBM
171
6
Output Printer
Control
and Power Units,
which are
mounted in two
standard relay
rack drawers
for
installation in
appro-
priate
loca
tions in the process. Protective housings
are
available
for the
control
a
nd
power
units when
relay
rack mounting is not
feasible. Fuses and
lights
on
th
e
front
of
the
power
unit
ca
n be
eas
il
y
replaced
without
removing
the
cover.
The printer is
connected to
the
control
unit by
an 8-foot cable
which permits the
printer to be placed
on a convenient
table
or
desk. Out-
put Printers
and
control units
ca
n
be
disconn ected
for
off-line servicing from
the
Serial
Input
/
Output
Chan-
nel without
affect ing
the
operation of other
units
o
n
the
channel.
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