Metasys device IP address assignment (DHCP or manual) - Metasys - LIT-12011279 - General System Information - Metasys System - 13.0

Network and IT Guidance Technical Bulletin

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Metasys System
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Technical Bulletin
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See Table 1 for IP address assignment rules in the Metasys system. In this table, the term Site Director is introduced. The Site Director is the device designated to maintain the site information by holding the Site object, which contains information about the logical organization of data about your facility, user password administrative information, and overall time and date. This function resides in an engine or in a Metasys Server on large installations. Although an engine can be a Site Director, if the site has a Metasys Server, then a Metasys Server must be the Site Director. The Site Director provides a uniform point of entry and supports functions such as user login, user administration, time synchronization, and traffic management.

Table 1. IP address assignments


Dynamic addressing

Static addressing




Recommended when the SNE/SNC is the Site Director

  • The SNE/SNC is a supervisory device for equipment controllers.
  • The SNE110Lx cannot be the Site Director. It must reside under an ADS-Lite Site Director.



Recommended when the NAE/NCE is the Site Director

  • The NAE/NCE is a supervisory device for equipment controllers.
  • The NAE85 is installed on a server-class computer, but all other network engines are stand-alone devices on the IP network.
  • The NAE45-Lite cannot be the Site Director. It must reside under an ADS-Lite Site Director.


Not supported


  • A DHCP server can be configured to assign a particular IP address to a particular MAC address; therefore, DHCP can be used to assign a static IP address to a device.
  • The NIE55 is a supervisory device for equipment controllers.
  • The NIE85 is installed on a server-class computer, but the NIE55s and NIE59s are stand-alone network engines on the IP network.



Recommended when the LCS85 is the Site Director

  • The LCS is a supervisory device for equipment controllers.
  • The LCS85 is installed on a server-class computer.
  • DHCP is supported as long as the same address is assigned to the LCS85 after a restart or shutdown for an extended period of time. If a new address is assigned, you must reconfigure the LonWorks software driver and update settings for the LCS85 designated as the configuration server.



Recommended when the ADS/ADX, or OAS is the Site Director

The ADS is loaded on a desktop-class computer and the ADX is installed on a server-class computer. The OAS is loaded on either a desktop-class or a server-class computer.


Supported for primary port only

Recommended for primary port; required for secondary port

  • Enable DHCP only if your network has one or more DHCP servers. Otherwise, the TEC20-3C-2 Coordinator may become unreachable over the network.
  • Only the primary Ethernet connection Primary Rate Interface (PRI), such as NET and LAN1, can be enabled to use DHCP. The secondary Ethernet connection (SEC), such as NET2 and LAN2) can only use static IP addressing.
  • The TEC20-3C-2 Coordinator is factory-configured with an IP address of and a submask of, where n equals the last number in the TEC20-3C-2 Coordinator serial number. When commissioning the device with the TEC Wireless Configuration Tool, do not assign your computer with the same IP address as the TEC20-3C-2 Coordinator’s factory-assigned IP address.



Recommended if communication issues arise

  • The WRS-RTN system is not supported at Metasys Release 9.0.7 or later.
  • If your devices use Network Address Translation (NAT) to communicate across the Internet, the NATs must provide static internal and external IP addresses. If you are using DHCP to assign addresses to devices that communicate across networks that use NATs, your DHCP server should be configured to always allocate the exact same IP address as the Metasys system devices' MAC addresses. This configuration makes these devices behave as if they have static IP addresses, although they have DHCP addresses. This behavior sometimes is called Dynamically Assigned, Statically Allocated addressing from a DHCP server.
  • The data transmission over Ethernet between a WRS-RTN and an engine consumes very little bandwidth (less than 1.5% of the usable bandwidth on a 10 Mbps Ethernet network, based on maximum device loading). Refer to the WRS Series Many-to-One Wireless Room Temperature Sensing System Technical Bulletin (LIT-12011095) for details.