User`s manual
Table 2-5 (Cont)
Synchronous Parameter Selection Switches
Switch
Function
Parameter Name
Pack Number Setting
Sync Req.
(cont)
2 SYNC REO.
1 SYNC 00
SI
5
ON
1 SYNC
01
SI
6
ON
1 SYNC 02
SI
7
ON
1 SYNC 03
Sl
8
ON
Sync Character
Desired Code
Sync A
S4
1
(As required
Codes
,j,
OFF=Logi-
8
cal
one)
Desired
Code
Sync B
S3
1
(As required
,j,
OFF=Logi-
8
cal one)
Line
synchronization
can
be
selected
by
the
receipt
of
either
one
sync
character
or
two
consecutive,
identi-
cal
sync
characters.
F
or
each
4-line
group,
two
sync
codes
(Sync
A
or
Sync
8)
may
be
manually
preset
in
the
Sync
Character
Code
switches.
The
PDP-ll
pro-
gram
may
select
either
of
these
two
sync
codes
for use
on
a selected line.
2.4.4 Installation
of
Add-On
DVll
Internal
baud
rate
is
determined
by
the
ON/OFF
states
of
the
Select A
and
Select 8 switches.
This
is
applicable
only
when
the
modem
does
not
supply
clocking.
2.4.3 Resistance Checks
Measure
the
resistance
between
the
following
pins
on
the
backplane
with
the
white
plug
of
the
7010835
cable
hanging
free
(not
plugged
in),
and
with
all
mod-
ules
plugged
in:
+5
V
to
GND
must
be 0.5 n
or
greater
-15
V
to
GND
must
be 50 n
or
greater
+
15
V
to
GND
must
be
10
n
or
greater
If
the
resistance
is less
than
the
lower
limit
indicated,
check
for
a
short.
If
the
resistance
exceeds five
times
the
low limit, it
may
indicate
an
open
circuit.
Make
each
measurement
twice,
once
for
each
polarity
of
the
meter.
The
lowest
reading
must
not
be less
than
the
low
limit
listed.
If
the
above
resistances
are
correct,
connect
the
white
plug
in
accordance
with
D-UA-
DVII-O-O.
2-16
Proceed
as
follows
to
install
an
add-on
DVll:
1.
Install
the
wired
backplane
assembly
in
the
mounting
box.
2.
Measure
the
resistance
between
pins
of
the
power
harness
(see first
paragraph
of
Section
2.3).
3.
Plug in
the
Mate-N-Lok
connector
of
the
power
harness.
4.
Apply
power
and
measure
voltages
at
the
logic
pins
(Paragrah
2,3),
5.
Turn
power
off.
6.
Set
all
address,
parameter
switches
(Para-
graphs
2.4.1
and
2.4.2)
and
distribution
panel
jumpers
(Figure
2-7).
7.
Install
modules
(Figure
2-2).
8.
Unplug
the
power
harness.
9.
Do
resistance
checks
(Paragraph
2.4.3).
10.
Apply
power.