MS/TP network wiring
Use the following principles when connecting the router to an MS/TP network:
l Connect no more than 128 BACnet devices to one MS/TP network. The devices can be
any mix of masters, slaves, or routers.
l Use twisted pair, shielded cable with capacitance of no more than 51picofarads per
foot for all network wiring. Belden cable #82760 or equivalent meets the requirements.
l Connect the -A terminal in parallel with all other - terminals.
l Connect the +B terminal in parallel with all other + terminals.
l Connect the shields of the cable together at each mid line device. For KMC BACnet
devices use the S terminal.
l Connect the shield to an earth ground at one end only.
l Use a repeater between every 32 MS/TP devices or if the cable length exceeds 4,000
feet (1,220 meters). Use no more than four repeaters per MS/TP network.
l Place a KMD-5567 surge suppressor in the MS/TP cable where it exits a building.
Illustration 1–3 MS/TPwiring
-A +B S
-A +B S
End of segment
Middle of segment
MS/TP EOL (End-Of-Line) termination switches
The controllers on the physical ends of the MS/TP wiring segment must have end-of-line
termination added for proper network operation.
l If the router is at the end of the network segment, set the EOL switch to ON.
l If the router is in the middle of the network segment, set the EOL switch to OFF.
Connecting power
Power the BAC-5051E router from a 24 volt power source, either AC or DC, or from a USB
connection. The router begins to operate when a power source is applied. Use the following
guidelines when choosing and wiring sources to the router.
BAC-5051E Router Section 1: Introduction
Revision J 9
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