Honeywell International Inc.

Honeywell Technologies Sarl

Yongxi Zhou

Jayaprakash Meruva

Vinay Kumar Prasad

Wolfgang Schmieder

Fei Chen

Balaji Krishnasamy

Ting Li

Jianping Chen

Graham Whiting

Xiaobo Zhang

Hu Zou

John Zhang

An automatic master slave system and approach for coordinated control of a parameter, for example, a heating, ventilation and air conditioning condition, in an area of multiple spaces controlled by room controllers. Changing a layout of a zone/area in a building such as moving, adding or removing a door, increasing or splitting size of a room through movable walls, or by permanently removing partitions, changing offices to a conference room or vice versa, may occur. A size of a room may be altered within minutes, according to customer demand. For instance, rooms may be converted into a single room by removing partitions. The controllers that were controlling temperatures of the rooms independently earlier, may convert automatically into a master-slave configuration and now work together to control a larger room. If the large room is split into multiple rooms, the controllers may automatically revert to their previous configuration.

Automatic master-slave system and approach

A method of communication between devices of a building management system () over a token ring network, comprising the steps of: a first device receiving () the token () for the token ring network; the first device, in response to receiving the token (), broadcasting () a request message over the network; a second device, in response to receiving the request message over the network, sending a command message to a receiving device over the network; and the first device passing () the token () for the token ring network to a subsequent device on the network.

Methods and devices for communicating over a building management system network

A flexible link system and approach for dynamically switching among wall modules of various types without re-engineering an associated controller application. Some of the types of wall modules may incorporate those of Sylk, BACnet and conventional types. A wall module type switching mechanism may incorporate a controller incorporating an application having a flexible link for the connection of wall modules of various types. The flexible link may enable a number of data points of the application to be applicable to various types of wall modules in that switching from a wall module of one type to a wall module of another type does not necessarily require another set of data points in the application.

Flexible link system for dynamic switching among different wall module types with a controller

A building automation and control network (BACnet) master-slave/token-passing (MS/TP) automatic media access control (MAC) addressing system having a BACnet MS/TP network, a MAC assigner on the network, and one or more MAC assignees on the network. Each assignee may have a global unique identity (GUID) and the assigner may have a pre-defined address. The assigner may gather virtually all GUIDs of the MAC assignees on the network and gather virtually all unused MAC addresses on the network. The assigner may map GUIDs to the unused MAC addresses and send a resulting map to the MAC assignees for assignment of a MAC address to each assignee. Each assignee may be assigned a MAC address according to its GUID, and the assignment of a MAC address to each assignee may occur automatically without manual intervention. In other words, the system may provide auto MAC addressing.

BACnet MS/TP automatic MAC addressing

Growing community of inventors

Beijing, China

Yongxi Zhou