You define DigiMesh networks with a unique network identifier. Use the ID command to set this identifier. For devices to communicate, you must configure them with the same network identifier and the same operating channel. For devices to communicate, the CH and ID commands must be equal on all devices in the network.
The ID command directs the devices to talk to each other by establishing that they are all part of the same network. The ID parameter allows multiple DigiMesh networks to co-exist on the same physical channel.