28
Tips and Things You Need To Know
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Each controller is delivered from the factory with the default MAC address set at 254. At this value, the
BACnet communication is NOT active and the device will not participate in the token pass either. The
local LED status for the communication adapter at this point is one short flash only. To enable the
BACnet communication, set the local MAC address configuration property of the controller to any valid
value from 0 to 127.
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After the initial configuration of your device and if your BAS allows you to remove objects, we suggest
that you remove all the configuration objects to prevent unnecessary polling of non used objects and to
help speed up the network.
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All configuration objects are available and accessible locally from the device itself using the local
configuration routine. Please refer to the Technical Manual
LIT-VT7600-PIR-Exx
and
LIT-VT760x7-
PIR-Exx
for details.
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In its default mode of operation, the device will automatically match its baud rate to the baud rate of the
network. Automatic baud rate detection will occur when the MS/TP communication port is initialized (on
power up). If the network speed is changed, the device will keep listening at the previously detected
speed for 10 minutes before resuming auto-bauding. Re-powering the devices will force right away
auto-bauding.
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If the device should go off-line, the following binded controller parameters will be released:
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Room
Temperature
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Outdoor
Temperature
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Occupancy
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The BACnet Data Link layer has two key parameters: the device object name and the device object ID.
The device object name must be unique from any other BACnet device object name on the BACnet
network (i.e. not just the MS/TP sub-network). The device object ID must be unique from any other
BACnet device object ID on the entire BACnet network (i.e. not just the MS/TP sub-network).
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Time synchronization can be made through a network even if the controller does not support the full
date. Therefore, the device cannot claim conformance to the DeviceManagement –
TimeSynchronization - B (DM-TS-B) service. The device object does not have the Local_Time or
Local_Date properties.
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Device Name and Device ID properties are writable in Viconics’ device object. Both properties can be
renamed from any BACnet network management tool as long as the tool itself give access to write to
these properties.
