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The BACnet discovery process uses broadcast messages, but broadcasts are blocked by an IP router. To deal with subnets, a BACnet/IP Broadcast Management Device (BBMD) must be used.
You may deploy the BASRTLX-B in a situation in which BACnet communication is confined to just one IP subnet. In such a case, BBMD configuration is unneeded. But if you are dealing with more than one IP subnet, you will need the BBMD functionality.
To implement BBMD in your BASrouterLX, select the BBMD Enable checkbox. The BBMD UDP Port drop-down menu selects which port, the primary port as specified on the System page, or the seconday port which is specified on the NAT page. Normally this is set to Primary.
Warning: If you enable BBMD when it is not needed, the router may attempt to find devices that are not present and thus traffic flow will be impaired and communication will suffer. Enable BBMD logging only when you have a BBMD issue. This will add a considerable amount of BBMD status information in the system log and could overwrite other logging information. The system log can be read via the Status ->Router ->View Log button.
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