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7.3
Connections and Wiring
Use the following guideline when connecting the controller to an MS/TP network:
1.
Connect not more than 128 addressable BACnet devices to one MS/TP network. The devices
can be any mixes of controllers, router and Building control.
2.
For best network performance, we suggest limiting the MS/TP network device to be less than
22 controllers.
3.
Use Twisted pair, shielded cable (22 - 24 AWG) with capacitance no more than 51 picofarads
per foot for all networking wiring in a branch.
4.
Connect the (-) terminal in parallel with all other (-) terminals.
5.
Connect the (+) terminal in parallel with all other (+) terminals.
6.
Connect the shields of the cable together at each midline controllers.
End of line Termination Return Switches
The controllers on the physical ends of each wiring segment must have the end of line termination
return switch on for proper network operation.
1.
For controllers at the end of the networking, set the Terminal Return to “ON”
2.
For the start or mid of controllers, set th
e Terminal Return to “OFF”
7.4
Network Bulbs
ASV305BF7XXXW VAV controllers include 3 status bulbs on the left-hand side of the controller. The
MS/TP status bulb serves three functions:
1.
Flashing
–
transmitting of data
2.
Blue light
–
TX
3.
Red light
–
RX
If either blue or red light is not flashing, it indicates that the network is not phased correctly.
Remove power and check on the networking wiring or power connections.
7.5
Setting Up Networking Communications
Set the network communication settings before connecting the controllers on the network. The
setting of the network requires the password to enter which described in the topic above. Please
see page 33 object List to change the default password, please take a look at AV41.
There are 3 settings to set before connecting to the MS/TP network:
1.
BACnet Instance ID
2.
MAC address
3.
Baud Rate
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