Multiple Unit Wiring
Wire Connection:
Cable / Deutsch Connectors
(see “Wire Connections” section for additional information).
7
SYSTEM WIRING
Over 100 devices can operate on one network, but only 8 full-duplex conversations can occur simultaneously.
The 2-wire network is connected by wiring intercoms in series. The positive network wire of one unit is connected
to the positive network wire of the second unit. The negative network wires are connected similarly. Network wires
between units must remain in pairs. Twisted pair wiring is prefered but not required. Both two unit wiring and multiple
unit wiring are shown below. The ends of a network are always completed with a terminator.
Two Unit Wiring
Wire Connection:
Cable / Deutsch Connectors
(see “Wire Connections” section for additional information).
Terminators
Two terminators are provided to complete a network circuit. The terminators are located at both ends of a network.
For optimal performance, install terminators as close to the unit as possible and no further than 6 feet in wire
length away. 51Ohm terminators are available from Firecom (see “Options and Accessories” section).
POWER
(+) RED/ 3C
(-) BLK/ 3B
POWER
(+) RED/ 3C
(-) BLK/ 3B
TERMINA
T
O
R
TERMINA
T
O
R
GRN/ 5B GRN/ 5B
WHT/ 5A WHT/ 5A
BLU/ 5E
ORG/ 5D
BLU/ 5E
ORG/ 5D
POWER
(+) RED/ 3C
(-) BLK/ 3B
POWER
(+) RED/ 3C
(-) BLK/ 3B
POWER
(+) RED/ 3C
(-) BLK/ 3B
TERMINA
T
O
R
TERMINA
T
O
R
GRN/ 5B GRN/ 5B
WHT/ 5A WHT/ 5A
ORG/ 5D ORG/ 5D
BLU/ 5E BLU/ 5E
BLU/ 5E
ORG/ 5D
WHI/ 5A
GRN/ 5B
