Titus Alpha BAC-8001/BAC-8201 Cooling Only - Manual (Page 13)

Installing the controllers
Connecting to an MS/TP network
13
Connecting to an
MS/TP network
The BAC-8000 series controllers are BACnet MS/TP compliant controllers.
Connect them only to a BACnet MS/TP network.
See Application Note AN0404A, Planning BACnet Networks for additional
information about installing controllers.
Connections and wiring
Use the following principles when connecting a controller to an MS/TP
network:
Connect no more than 128 addressable BACnet devices to one MS/TP
network. The devices can be any mix of controllers or routers.
To prevent network traffic bottlenecks, limit the MS/TP network size to 60
controllers.
Use 18 gauge, twisted pair, shielded cable with capacitance of no more than
51 picofarads per foot for all network wiring. Belden cable model #82760
meets the cable requirements.
Connect the - A terminal in parallel with all other - terminals.
Connect the + B terminal in parallel with all other + terminals.
Connect the shields of the cable together at each controller. For KMC
BACnet controllers use the S terminal.
Connect the shield to an earth ground at one end only.
Use a KMD–5575 repeater between every 32 MS/TP devices or if the cable
length will exceed 4000 feet (1220 meters). Use no more than four repeaters
per MS/TP network.
Place a KMD–5567 surge surpressor in the cable where it exits a building.
Illustration 2-5 MS/TP network connection
S +B -A