Specifications

C E N T A U R U S P R I M E
3
33
3
Connecting Power to the Gateway
Power connections are made by removing the 2 screws on either side of the terminal
block enclosure. Follow the diagram below for proper terminations.
Picture 1.0, Connecting the power
Connecting Trane VAV Trunks to the Gateway
Typically, Trane device trunks (possibly several trunks) are connected to a Trane BCU
(“BACnet Control Unit), with various combinations of “Com1”, “Com2”, “Com3”,
Com4” and “Com5” trunks, each via a special card in the BCU. These are NOT to be
confused with PC-based “Com” ports. The Trane “Com” trunks each use different
technologies (e.g., Com5 is a Echelon LON trunk; Com 1 and Com3 are the same
except Com1 is non-isolated and Com3 features voltage isolation). The RS-485
“Com” trunks from the Trane BCU are removed and simply re-connected to the
Centaurus Prime Trane-485 Gateway.
The trunk connections are clearly marked and each trunk is only a two-wire
connection. The trunks have a “plus” and “minus” side, and also a “shield”
connection that goes to cabinet (AC) ground. Be sure that the polarity is correct, and
that the shields are ALL tied together and only connected to ground at ONE place (to
120 Volt Hot
Ground
120 Volt Neutral