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code 9 message
will
be sent
and the
680 will
not
redial,
whether
or not
"kiss-off"
is subsequently
received.
ConneMwwChannel
B
_
Channel
B,
like
Channel
A, can be triggered
in any one of
three
ways:
I.
:Bi
a 6-l2V.
,DC voltage
input
from
a control
instrument
(Diagram
8).
This
method
is used when the
680 is used as a "slave"
to an existing
local
a I arm.
2. By a norma I I y open "dry"
contact
closure
(Diagram
9a 1:
In this
mode,
'Channel
B WIII
trigger
and transmit
upon sensing
the
closure
of a
normally
open circuit.
Additional
N.O.
contacts
may be placed
in
parallel
with
the
one shown,
if
desired.
3. By the opening
of
a normally
closed
"dry"
contact
(Diagram
9b):
Additional
N.C.
contacts
may be placed
in series
with
the
contacts
shown.
Note:
This
method
places
a constant
additional
load
of
IOma for
this
channel
on the
680's
power
supply
and requires
the
addition
of a 680 ohm,
l/4
watt
resistor
(not
supplied).
a----
b-2
3
4
5
6
L -w-w---
w
-
+
TOE
DC
ALARM BELL
TERMINALS
OF CONTROL
Diagram 8: CHANNEL
B Triggering
by
Voltage
Input
FROM
PC BOARD
(CONNECT LATER 1
FLYlNG LEADS
FROM PC BOARD
KDNNECT LATER)
Diagram 9: CHANNEL
B Triggering by
Dry Contact (N.O. or N.C.)
Note :
Channel
B is.pre-wired
for
NON-ABORT ONLY operation.
Ground Connection:
The 680 contains
surge
arrestors
to
help
protect
the
dialer
circuits
from
volt-
age surges
on the
telephone
line.
For proper
protection,
terminal
2 of the 680
must be connected
to a cold
water
pipe
ground.
A GREEN 18"
lead
with
a "U"
lug
at one end has been provided
for
this
purpose.
IMPORTANT:
The 3 leads
from
the
surge
arrestors
must
be'connected
to terminals
I,
2, 3 as shown
in Diagram
IOA (RED leads
to.1
and 3, GREEN to 2).
Telephone
Line Connections:
Connection
of the
680 to
the
telephone
line
should
be made via
an Ademco No. 620
irect
Connect
Cord which
plugs
into
a telephone
company
supplied
jack
(USOC No. RJ3lX
r
RJ38X).
Use Diagram
IOa if
no line
seizure
is desired.
223
216
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