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SECTION
VI
INTERFACE
UNIT
CONSTRUCTION
This section covers
the
nonelectronic aspects
of
interface
unit
construction.
The
ix-PACe
used
in
interfacing
are described
in the
appendix as an
aid
in
design.
The
following topics
are
presented:
a.
Circuits
e.
Cables
b.
Packaging
f.
Configuration
c.
Power
supplies
g.
Rack
requirements
d.
Coding
Honeywell
supplies a
complete
line of
logic
modules
and accessory
hardware
for
constructing interface
units.
The
unit
should be
housed
in
the
mainframe drawer
or
in
an
extension
drawer (Model HI
12-10).
This
will
facilitate
cabling
and provide proper
cooling.
In
large interface
units,
however,
it
is
sometimes
preferable
to
divide the interface
hardware between
the
controller
and
external device.
The
interface circuitry
associated
with
the
controller
I/O bus can
be contained
in
the
drawer
with
the
mainframe.
A
cable
arrangement
is
then constructed
to
the
interface circuitry located
in the
external device
which
eliminates extending
the
I/O bus
to
the
remote
unit
or trying
to
fit
all
the
circuitry
into the
HI
12
drawer.
CIRCUITS
A
wide variety
of
standard
fx-PACs are
available for
implementing
the
design
of
inter-
face
units.
These
PACs
are compatible mechanically and thermally with those
used
in the
mainframe.
The CS-517, CS-520, CS-521, and CS-548 |a-PACs
are suggested
for interfacing the
programmed
I/O bus and
DDC
bus.
Descriptions
of
these
PACs
are contained
in the
appendix.
PACKAGING
Each
1x3
OMNI-BLOC
contains 24
slots for
receiving (i-PACs.
Multiple
units
can be
assembled
to
provide
additional slots for
more
complex
functions.
The
OMNI-BLOC
has
jumper
wires
for
power
bussing,
PAC
guides,
and miscellaneous mounting hardware.
The
1
x
3
part
number
is
70 026 175
701.
Insulated
wire
(No. 30)
especially
made
for
solderless-wrapped
connections
is
used
for signal
wiring on
the
OMNI-BLOC.
This wire
is
available
from Gore
Associates,
Newark,
Delaware
or
from CCD,
No. 70 940 061
110.
The hand wire -wrapping
tool
(battery
operated,
CCD
No. 70 917
200
001;
Gardner-Denver
No. 14R2,
bit
504221, sleeve 500350)
is
recom-
mended
for
wire
installation.
Also
the
hand wire -unwrapping
tool (No.
CCD
70 917
202
001;
Gardner-Denver 505084-LH)
is
recommended
for
removing solderless-wrapped
connections.
6-1
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