Keybus Operation And Wiring; Current Ratings - Modules And Accessories - DSC Power 864 Installation Manual

side of any alarm warning device to BELL+, the negative side to
BELL–. The BELL output is protected; if too much current is drawn
from these terminals (wiring short) the BELL PTC will open.
The Bell output is supervised. If no alarm warning device is being
used connect a 1000 ohm resistor across BELL+ and BELL– to pre-
vent the panel from displaying a trouble condition (see section
"[*][2] Trouble Display" on page 15).
Keybus Terminals - RED, BLK, YEL, GRN
The Keybus is used by the panel to communicate with modules
and by modules to communicate with the panel. Each module
has four Keybus terminals that must be connected to the four
Keybus terminals on the panel. For more information, see section
2.3 "Keybus Operation and Wiring" on page 6.
Programmable Outputs - PGM1, PGM2, PGM3, PGM4
Each PGM output is designed so that
when activated by the panel, the termi-
nal will switch to ground
PGM1, PGM3, and PGM4 can each
sink up to 50 mA of current. These
PGMs can be used to activate LEDs or a
small buzzer. Connect the positive side
of the LED or buzzer to AUX+, the neg-
ative side to the PGM.
PGM2 is a high current output
(300mA) and operates similarly to
PGM1. If more than 300 mA of current
is required, a relay must be used. Refer to the diagram.
Zone Input Terminals - Z1 to Z8
Each detection device must be connected to a zone on the con-
trol panel. It is suggested that each zone have one detection
device however it is possible to wire multiple detection devices to
the same zone.
For zone wiring specifics, see section 2.9 "Zone Wiring" on page
8.
Telephone Connection Terminals - TIP, RING, T-1, R-1
If a telephone line is required for central station communication
or downloading, connect an RJ-31X jack in the following man-
ner:
Connect the PC5020 and modules that use the telephone line(s)
in the following order:
For example, if you are installing a PC5020 with a LINKS1000/
GSM1000 and a PC5928 Intercom module, connect the incom-
ing line to the LINKS1000/GSM1000, then from the LINKS1000/
6
GSM1000 to the PC5020, then from the PC5020 to the PC5928
Intercom and then from the PC5928 to the house telephones
NOTE: For proper operation there must be no other tele-
phone equipment connected between the control panel
and the telephone company facilities.
Do not connect the alarm panel communicator to tele-
phone lines intended for use with a FAX machine. These
lines may incorporate a voice filter which disconnects the
line if anything other than FAX signals are detected, result-
ing in incomplete transmissions.
2.3

Keybus Operation and Wiring

The Keybus is used by the panel to communicate with all mod-
ules connected and by the modules to talk to the panel. The RED
and BLK terminals are used to provide power while YEL and GRN
are clock and data.
NOTE: The 4 Keybus terminals of the panel must be con-
nected to the 4 Keybus terminals or wires of all modules.
The following conditions apply:
• Keybus should be run in minimum 22 gauge quad (0.5mm),
two pair twist preferred
• the modules can be home run to the panel, connected in
series or can be T-tapped
• any module can be connected anywhere along the Keybus,
you do not need a separate Keybus wire run for keypads,
zone expanders etc.
• no module can be more than 1,000'/305m (in wire length)
from the panel
• shielded wire is not necessary unless wires are run in an area
that may present excessive RF noise or interference
Example of Keybus Wiring
Module (A) is wired cor-
rectly as it is within 1,000'/
305m of the panel, in wire
distance. Module (B) is
wired correctly as it is
within 1,000'/305m of the
panel, in wire distance.
Module (C) is NOT wired
correctly as it is further
than 1,000'/305m from the panel, in wire distance.
2.4 Current Ratings - Modules and
Accessories
In order for the Power864 system to operate properly, the power
output capabilities of the main control and expansion devices
must not be exceeded. Use the data presented below to ensure
that no part of the system is overloaded and cannot function
properly.