26
PRODIGY
®
- DIGITAL VAV DIFFUSERS
NATIVE BACNET NETWORK INTERFACE OPTIONAL ACCESSORY
PRICE PRODIGY
®
- Manual
|
priceindustries.com
BACnet Wiring
Price Prodigy Diffusers, when selected with the optional
BACnet interface, have the option of using supplied 35’ CAT 5
cables to run BACnet MS/TP, or field supplied 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 1 050 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. Prodigy Diffusers have
the option for enabling termination via a DIP switch or by a
software menu selection. Turning on termination via software
will enable the resistor across the lines and also turn on a
green LED labeled “TRM”.
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.
MASTER JUCTION BRACKET
ELECTRICAL NOISE EXAMPLE
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.
8 7654321
NET
IN
NET
OUT
BACnet to
next device
BACnet from
previous device
FAULT
Prodigy Master Top View of
circuit board mounting bracket
DIP switches for
MAC address
and termination
RJ - 45
Jacks
HIGH VOLTAGE/
CURRENT LINE
BACNET NETWORK
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