Cable For Fc Buses And Sa Buses In Order Of Preference - York Predator ZR series Installaton Manual

Table 29: Smart Equipment™ UCB Details (Continued)
J15
FC+
FC–
COM
SHLD
EOL
switch
EOL
FC BUS
ISO PWR
1. When wiring unit and other devices using the SA Bus and FC Bus, see Table 30.
Table 30: Cable for FC Buses and SA Buses in Order of Preference
Bus and Cable Type
FC Bus: 22 AWG Stranded, 3-Wire Twisted Shielded Cable
SA Bus (Terminal Block): 22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Shielded Cable
SA Bus (Modular Jack):
26 AWG Solid 6-Wire, 3 Twisted-Pair Cable
FC Bus: 22 AWG Stranded, 3-Wire Twisted Non-Shielded Cable
SA Bus (Terminal Block): 22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Non-Shielded Cable
1. We strongly recommend 3-wire (for FC bus) and 4-wire, 2 twisted-pair (for SA bus), 22 AWG stranded, shielded cable. A 22 gauge cable
offers the best performance for various baud rates, cable distances, and number of trunk devices primarily due to lower conductor-to-
conductor capacitance. Shielded cable offers better overall electrical noise immunity than non-shielded cable. Observe the shield
grounding requirements.
2. We recommend 26 AWG solid, 6-wire (3 twisted pairs) cable as the best fit for fabricating modular cables with the modular jack housing
assembly. Be sure the cable you use fits the modular jack housing. The preassembled cables that are available from Anixter (Part No.
CBL-NETWORKxxx) use 24 gauge wire.
Johnson Controls Ducted Systems
Description
Factory wired SA Bus connector
Optional communication sub-board at center of UCB
1
Terminal FC BUS connections on left edge of the communication board
FC ("Field Connected") BUS BACnet MSTP
communication
FC ("Field Connected") BUS BACnet MSTP
communication
Common for the FC ("Field Connected") BUS
BACnet MSTP communication circuit
Shield for the FC ("Field Connected") BUS
BACnet MSTP communication circuit
Item Selector in red housing at left on top edge of the communication board
End Of Line selector switch for the FC BUS
BACnet MSTP communication circuit
LEDs on the communication board
Green End Of Line indicator
Green FC bus communication transmission
indicator
Green communication board Isolated Power
indicator
1
2
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts
reading to COM; at least 0.25 volts higher than –) FC bus
BACnet MSTP communication circuit
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts
reading to COM; at least 0.25 volts lower than +) FC bus
BACnet MSTP communication circuit
Negative of the VDC FC bus BACnet MSTP communication
circuit
Earth ground reference of the cable to prevent interference on
the FC bus BACnet MSTP communication circuit
ON selected only for the UCB that is the terminus of the FC bus
BACnet MSTP communication cable to prevent signal "bounce-
back"
Lit indicates the EOL switch is selected ON
Lit/flickering indicates outgoing UCB FC bus communication is
currently active, off indicates the UCB is awaiting incoming FC
bus communication
Lit indicates the UCB is supplying power to the communication
sub-board
Non-Plenum Applications
Part Number O.D.
Anixter:
CBL-22/3-FC-PVC 0.138 in.
Belden®: B5501FE
Anixter:
CBL-22/2P-SA-PVC 0.209 in.
Belden: B5541FE
— —
Belden: B5501UE 0.135 in.
Belden: B5541UE 0.206 in.
5167540-YIM-H-0518
Function & Comments
Plenum Applications
Part Number
Anixter: CBL-22/3-FC-PLN
Belden: B6501FE
Anixter: CBL-22/2P-SA-PLN
Belden: B6541FE
Anixter preassembled: CBL-
NETWORK25 CBL-
NETWORK50 CBL-
NETWORK75 CBL-
NETWORK100
Belden: B6501UE
Belden: B6541UE
O.D.
0.140 in.
0.206 in.
0.15 in.
0.131 in.
0.199 in.
61