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BACnet Gateway: Directions & Applications
Setting the BBMD (BACnet/IP Broadcast Management Device)
BBMD: BACnet/IP Broadcast Management Device
The BACnet system relies on the use of broadcast messages. Routers join IP networks together so messages
from one network can be sent to another. However, most routers do not forward broadcast messages and the
BACnet signals do not get passed correctly.
To solve this problem BACnet provides a technology called BBMD which means
BACnet/IP Broadcast
Management Device
.
BACnet/IP requires that a BBMD be defined on every subnet for cross-router communications. The WNG-2133
can act as a BBMD for the subnet that it resides on, while another BBMD must reside on the other subnet to
pass the information forward. Setting the
Connection_Type
to
BBMD
will enable this functionality on the WNG-
2133. Note that BBMD operation is not required if there is already another BBMD on the network.
The WNG-2133 supports the method of updating its internal broadcast distribution table to create BBMDs.
Two steps are needed:
1.
Creating
a custom “bdt.ini
” file and downloading it to the WNG-2133
2. Uploading the
config.csv
file to the PC, editing the
config.csv
file then downloading it to the WNG-2133
1. Creating and Downloading the bdt.ini File
The Broadcast Distribution Table can be configured using
the
bdt.ini
file. The
bdt.ini
file must be created and
downloaded to the WNG-2133 using the Ruinet
Download
Configuration
command. This example shows the WNG-
2133 as
IP
10.33.12.23
and the BBMD on the other
subnet as
IP
10.33.11.21
:
//=====================================
// bdt.ini
//
// FST Customer : Douglas Lighting
// Configured By : CBR
//
// Copyright (c) 2000-2002 WNG-2133 Technologies
//
// BBMD ip_address BBMD port BBMD subnet Mask
//
10.33.12.23, 47808, 255.255.255.0
10.33.11.21, 47808, 255.255.255.0
//=====================================
To download the bdt.ini File to the WNG-2133
1. From the main menu select <
D>
to go to the download
screen.
2. Use the <
O>
key to enable the downloading of 'other'
files. When enabled you can download files other than
.csv
to the WNG-2133. Exercise caution with this option.
3. Specify the local file name by selecting <
L>
, then type
the path and file name and press <
Enter
>.
4. If the remote filename is incorrect, select <
R
>, then type
the file name and press <
Enter
>.
5. Begin the download by selecting <
D
>.
2. Uploading, Editing and Downloading the
config.csv File
To upload the config.csv File from the WNG-
2133 to your PC
1. From the main menu select <
U>
to go to the upload
screen.
2. Begin the uploading by selecting <
U>
.
To edit the config.csv File on your PC
1. Locate the files where the
Ruinet.exe
executable resides.
2. Select and launch the
NOTEPAD
program to edit the file.
(Using any other program may corrupt the file).
3. Within the
config.csv
file, locate the
Server Side
Connections - BACnet IP
area. Append the
,Connection_Type,IP_Port
to the first line and
,BBMD,47808
to the next line. This should appear as
shown below:
//=====================================
//
//
Server Side Connections -BACnet IP
//
Connections
Adapter, Protocol,
Connection_Type,IP_Port
N1, BACnet_IP ,
BBMD,47808
//=====================================
To download the edited File to the WNG-2133
1. From the main menu select <
D>
to go to the download
screen.
2. Begin the download by selecting <
D>
.
