Mitsubishi Electric AE-200A Instruction Book page 64

The use of IP routers will require the default gateway setting to be configured beforehand.
(Refer to 8-2-1-2 "LAN2 (for BACnet
The use of remote BBMD will require the "Use Remote BBMD" setting to be configured beforehand.
(Refer to 8-4-1-3 "Use Remote BBMD" for details.)
3. Message transmission across networks
IP routers transfer Unicast messages across networks, but not broadcast messages.
BBMDs are used to transmit broadcast messages across networks.
If no BBMD is connected to the transmission originator device network, use a remote BBMD (one that is
connected to another network).
To use a remote BBMD, register the information of the device to be connected to the remote BBMD as an
external device. The IP address of the remote BBMD to be connected will be required.
A transmission originator device sends a transfer request message to a remote BBMD. The remote BBMD
that received the transfer message will transform the message to a BBMD transfer message, and sends it
to the destination BBMD via IP routers.
(Originator Remote BBMD → IP router → IP network →IP router → Destination BBMD).
The transmission destination BBMD transformes the received BBMD transfer messages into broadcast
messages and transmit them to the devices on the target network.
Broadcast messages from other networks are transferred by the remote BBMD to an external device.
Important
Transfering messages between BBMDs will require the BDT (Broadcast Distribution Table) settings on
the BBMDs to be made. It is assumed here that the BDT settings have already been made.
WT07921X01
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)" for details.)
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