25
At any baud (9600, 19200, 38400 baud), the number of
controllers is limited to 239 devices maximum. Bus length
may not exceed 4000 ft, with no more than 60 total
devic es on any 1000--ft section. Optical ly isolated RS --485
repea ters are required every 1000 ft.
NOTE: Carrier device default i s 9600 band.
COMMUNICATION BUS WIRE SPECIFICATIONS —
The CCN Comm unication Bus wiring is field--supplied
and fiel d--installed. It consists of shielded 3--conduc tor
cable with drain (ground) wire. The cable selected must
be identical to the CCN Communication Bus wire used for
the entire network.
See Table 6 for recommended cable.
Table 6 – Recommended Cables
MANUF ACTURER CABLE PART NO.
Alpha 2413 or 5463
American A22503
Belden 8772
Columbia 02525
NOTE: Conductors and drain wire must be at least 20
AWG, stranded, and tinned copper. Indivi dual conductors
must be insulated with PVC, PVC/nylon, vinyl, Teflon, or
polyethylene. An aluminum/ polyester 100% foil shield
and an outer jacket of PVC, PVC/nylon, chrome vinyl, or
Teflon with a minimum operating temperature range of
-- 2 0 _Cto60_C is required. Do not run communication
wire i n the same conduit as or next to any AC voltage
wiring.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must
be c onnected to ground at only one single point. If the
communication bus cable exits from one building and
ente rs a nother building, the shields must be connected to
the grounds at a lightning suppressor in each building (one
point only).
Connect ing CCN bus:
NOTE: When connec ting the communication bus cable,
a color code system for the entire network is
recom mended to simplify installation and checkout. See
Table 7 for the recommended color code.
Table 7 – Color Code Recommendations
SIGNAL TYPE
CCN BUS WIRE
COLOR
CCN PLUG PIN
NUMBER
+ Red 1
Ground White 2
--- Black 3
Connect the CCN (+) lead (typically RED) to the unit’s
TB1--12 termina l. Connect the CCN (ground) lead
(typically WHT) to the unit’s TB1--14 terminal. Connect
the CCN (--) lead (typically BLK) to the unit’s TB1--16
terminal. See Fig. 46.
CCN Bus
J2-1
J2-2
GND (WHT)
12
14
TB1
J2-3
– (BLK)
16
TB1
TB1
PL
+ (RED)
C08276
Fig. 46 -- PremierLink CCN Bus Connections
50TCQA
