BAcnet BBMD

[jmir]

Hi,
I'm trying to use LM5 as Bacnet Server and I've a doubt.
Can LM5 act as BBMD? Or are the parameters inside "BACnet Setting" tab used to connect to a BBMD?

Which is the best way to communicate a Bacnet Server to a Bacnet Client when they are in different networks through a router?

Thanks.

[Daniel]

Bacnet Client must have BBMD and LM can connect to it.

[jmir]

Bacnet Client must have BBMD and LM can connect to it.

If the Client is on the WAN side of the router, is only one BBMD needed on WAN side?

[Daniel]

I'm not the expert on this but I think yes.

[Erwin van der Zwart]

You must see a BBMD as a tunnel between 2 BACnet networks, it takes a broadcast message from network 1 as unicast message and broadcast it on the secondary network again. Only ONE BBMD should be configured per TCP/IP subnet. I repeat ONLY ONE !  Just like KNX routers you can only have one tunnel between your 2 networks to avoid loops.

As you can see in this image you need a BBMD in each network, if you only have one BBMD you might want to register it as foreign device..