Lon

[gazoo]

what is the difference between a channel and subnet?

[crab master]

From the LonMaker User's Guide
"Channel
The physical media between devices upon which the devices communicate. The LonTalk protocol is media independent; therefore, numerous types of media can be used for channels: twisted pair, power line, fiber optics, IP, and RF, and other types."

"Subnet
A logical collection of up to 127 devices within a domain. Up to 255 subnets can be defined within a single domain. All devices in a subnet must be on the same segment. Subnets cannot cross nonpermanent type routers."

"Channel Segment
A portion of a channel. A single segment can be comprised of multiple sections connected by physical layer repeaters."

[gazoo]

So a subnet has to have nodes all from the same channel??

[crab master]

By the definition that's what it looks like.
What brings up these questions? I've done a lot of LON and never reply worried about such as it is automtically handled. I just payed attention to wiring guidelines, device count on a segment/channel and terminator(s).

[gazoo]

I have a Lon/ niagra project that originally had ft to ft routers that lonmaker automatically gave the same channel id(#) to the subnet. The building had the routers changed out to ft/Ethernet routers. This made channel/subnet ids not to match. This change i suspect is causing issues with niagra. In discovery I am seeing controllers from other channels. Like it is reading thru routers to other channels. Sounds weird I know but this is what is happening