Air flow communication network (F-COM)

On CET MS/TP automation stations (DXR2.M17x), a signal collected over the BACnet F-COM (flow communication) MS/TP network communicates the volumes of air supplied and exhausted in and out of the room, including supply terminal(s), extract terminal(s), and fume hood(s). This separate, dedicated BACnet MS/TP network is needed because the standard BACnet MS/TP network is occupied with other network traffic and unable to handle air flow data at speeds necessary for dynamic room pressurization changes.

Multiple fume hood flows are totaled by the CetRCtl group manager object. The result is displayed in the object for Room fume hood air volume flow (AirFlFhR) located in the pressure control AF (CetAirFlTck11 or CetPFlCas11).

The following figure provides a simplified view of F-COM network only. The standard BACnet MS/TP network wiring is not shown.

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