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6
DC-8 Plus Installation and Operation Manual
SECTION TITLE
CAUTION!
For safety, do NOT
connect 120VAC cir-
cuits to the RELAYS.
WEBSITE:
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product updates and
additional information
INSTALLATION
INSTALLING THE DC-8 PLUS
Please examine your DC-8 Plus carefully for any damage that may have been sus-
tained during shipping. If any is noted, please notify the shipper immediately and
retain the packaging for inspection by the shipper. The package should contain the
DC-8 Plus, 16.5 Vac @ 600 ma wall power transformer and this manual and modu-
lar cable.
Before permanently installing the DC-8 Plus, we recommend that you connect the
unit to the wall transformer, telephone line and telephone set and become familiar
with the operation of the unit. Please refer to the programming and operation sec-
tion of this manual. If the DC-8 Plus is to share the phone line with a modem, the
purchase of a Voice/Data switch may be in order. The modem should be connected
to the modem port, while the DC-8 Plus should attach to the voice or TAD port.
These units are under $60.00 at Office Max/Depot.
NOTE:
Installation of the DC-8 Plus in high RF environments should be
performed with care. Shielded cable is suggested for all connections.
Shields and station ground should be tied to the CHASSIS GROUND screw
located on the far right side of the DC-8 Plus, as viewed from the rear. It is
recommended that all cables connected to the DC-8 Plus be looped through
ferrite cores to suppress RF. Surge protection with RF filtering such as
the Tripp-Lite “ISOBAR ” or equivalent is also suggested for the power
transformer, while the Tripp-Lite DTEL-2 is very effective for the tele-
phone line. The purchase of an inexpensive uninterruptible power sup-
ply (UPS) will provide back up in case of power outages.
The connection of the DC-8 Plus to a standard telephone line or cellular telephone
with the appropriate interface is through the RJ-11 jack located at the far left side of
the unit, as viewed from the rear. This jack is labeled "Line" and should be con-
nected to the incoming phone line. The recessed second RJ-11 jack labeled "Phone"
is for the connection of a touch-tone
®
telephone, used to program or operate the DC-
8 Plus when in the LOCAL mode. The DC-8 Plus is supplied with a 16 to 18 volt @
600 ma AC wall style transformer, connection from the wall transformer is made on
the far right hand side of the unit, labeled
P1
. Connections on the DC-8 Plus are via
screw style wire captive terminals located at the rear of the unit. Connections to the
screw style wire captive terminal should be made using 20 AWG or smaller solid or
stranded wire. Strip off approximately 7/16" insulation from the connection end of
the wire, insert the bare wire end into the opening of the desired terminal and tight-
en the locking screw with a small screw driver. The relays are denoted as K1
through K8. K1 and K2 are 2PDT relays, while K3 through K8 are SPDT. JP1 is
provided to tie K1 and K2 together. The normally open contact is noted as
NO
. The
normally closed contact is labeled
NC
and the wiper (common) is denoted as
CM
.
This convention holds true for all eight relays. The three open collector outputs
(ground sink) are rated at 24 vdc @ 60 ma and are diode protected. The collectors
are available at each labeled terminal, while the emitters are tied to DGND.
NOTE:
For safety, do NOT connect 120VAC circuits to the RELAYS.
