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BACNet Flow CoNtroller
NETWORKING & SETUP
BACnet wiring
The Price BACnet Flow Controller (BFC) has the option of
using a CAT 5 cable to run BACnet MS/TP, or cable hardwired
into a pluggable terminal block (see next page if using
hardwired BACnet connections). The RJ-45 jacks for use with
the supplied BACnet cables are directly tied to the pluggable
terminal block, and so any combination of supplied cables
and hardwired connections can be used on a single network
segment.
BACnet networks must be run in a daisy chain configuration,
meaning there is only one main cable and each network device
is connected directly along its path, with no more than 30
devices per segment, and MS/TP segment lengths must not
exceed 1050 feet.
termination
BACnet MS/TP networks must be terminated to ensure proper
operation. A network should be terminated twice, once at
the beginning and once at the end. Termination helps reduce
reflections and noise. The terminating can be done with a 100
ohm resistor across the + and - lines. Termination can also be
done via software using the Price BACnet Flow Controller. For
more information see the BACnet Service Menu section of this
manual.
Tech Tip: The Price BACnet MS/TP to IP Router has built
in termination and it is enabled by default (since the router is
typically the beginning of the entire MS/TP network). Now you
only have to go and find/terminate that last device.
electrical Noise
Electrical noise can affect both analog signal and digital
communications such as BACnet. Therefore do not route
high voltage lines next to the BACnet network! Avoid noisy
electrical sources such as:
•
Variable Frequency Drives
•
High current power lines
(main panel feeds)
•
Fluorescent light fixtures
If you must pass near noisy electrical lines cross at right
angles. This will help reduce the amount of noise coupled to
the network wires.
12
BACNet FLow CoNtroLLer - Manual | priceindustries.com
BACNet wIrING
eleCtrICAl NoISe eXAMPle
HIGH VOLTAGE/
CURRENT LINE
BACNET NETWORK
TO NEXT
DEVICE
FROM
PREVIOUS
DEVICE
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