Manage LON Addresses

This section consists of the following:

The i.LON 700 can be used with LON/IP devices. A LON/IP device may have multiple LON/IP Layer 3 addresses. There are two types of LON/IP Layer 3 addresses: unicast and multicast. Unicast addresses uniquely identify an individual LON/IP device. Multicast addresses identify a group of LON/IP devices.

The LON/IP network address is an IP address. The format of the IP address is channel-type dependent. For IP-70 LAN channels, a standard IPv4 network address format is used. For LON channels, a standard ISO/IEC 14908-1 network address format is used. The LON/IP protocol specifies the conversion between the different address formats using a stateless algorithm. LON/IP LAN to LON routers such as the i.LON 700 use this algorithm to route packets between LAN and LON channels, automatically converting the addresses as required. Since the algorithm is stateless, LON/IP routers do not require special provisioning or configuration to perform the network address format conversion. 

Unicast LON/IP Addresses

Network address conversion for unicast addresses is dependent on the LON/IP domain length and value. The LON/IP domain length can be 0, 1, or 3 bytes. LON/IP does not support 6-byte domains.

The following table summarizes the conversion between a LAN channel and a LON channel for a LON/IP address with a domain of up to 3 bytes (D1D2, and 00), a one-byte subnet ID (S), and a one-byte node ID (N).

LON/IP Domain Length

LON/IP Domain ID Value

LAN IPv4 Address

LON ISO/IEC 14908-1 Address

0


192.168.S.N

SN

1

D1

10.D1.S.N

D1SN

3

D1D200

D1.D2.S.N

D1D200, SN

The LON/IP domain, subnet, and node IDs must meet the following requirements:

  • The domain ID length must be 0, 1, or 3 bytes. A 6-byte LON/IP domain ID is not valid.
  • The first byte of a 3-byte domain ID must not be 10 (0x0A), or a value between 224 (0xE0) and 239 (0xEF).
  • The first two bytes of 3 byte domain ID must not be 192, 168 (0xC0, 0xA8).
  • The third byte of a 3-byte domain ID must 0.
  • The subnet ID must be a value between 1 and 254, inclusive. The subnet ID cannot be 0 or 255.
  • The node ID must be a value between 1 and 127, inclusive. The node ID cannot be 0 or a value greater than 127.

Other domain IDs may not be valid in a particular IP infrastructure as they may conflict with existing IP addresses.

Multicast LON/IP Addresses

There are three types of LON/IP multicast addresses: domain broadcastsubnet broadcast, and group addresses. Network address conversion for multicast addresses is dependent on the type of multicast, as shown in the table below: 

LON/IP Multicast Address Type

LON/IP Address Value

LAN IPv4 Address

LON ISO/IEC 14908-1 Address

Domain Broadcast


239.192.0.0

14908-1 Domain Broadcast

Subnet Broadcast

S

239.192.0.S

14908-1 Subnet Broadcast to S

Group

G

238.192.1.G

14908-1 Group G