DDC Online direct digital controls
Automated Logic - WebCTRL  

System Architecture

Date Last Saved: 11/13/2015 3:29:28 PM

This section distinguishes between Operator Interfaces and Field Interfaces to the BAS. The Operator Interface refers to the main 'front-end' method for accessing and operating the BAS. The Field Interfaces typically access the BAS from the controller-level and have limited functionality, and may include HID, LDP, and ZBI as described below. This section describes the devices only; OI functionality is generally covered in the Software, while Field Interface functionality is detailed further in the individual Controllers
Operator Interfaces (OI)
Dedicated Operator Workstation (OWS)
Dedicated PC(s) with proprietary workstation software
None. Traditional OWS functions available through Thin Client. Web server (shown in architecture drawing) is used for system configuration/programming via browser interface.
"Thin" Client Browser Internet Explorer. Requires WebCTRL software running on a Web Server PC located on the IT Network.
"Thick" Client Browser thick
Product Application(s): N.A.
Handheld Interface Devices (HID)
PDA-Based Web-enabled cell phones, PDAs
Proprietary Logistat Pro thermostat can be used as a hand held/portable device for test and balance of U-Line (secondary) controllers. Plugs into communications jack at thermostat.
Local Display Panel (LDP) BACview panel mounted display:2 line x 16 character display, or 4 line x 40 character display Can be connected to the Uni 16/32
Zone Based Interfaces (ZBI)
Thermostat with communication port to access local controller/network Information not provided.
Other thermostat types available (without communication ports)
New Group
Zone sensor test
Zone sensor w/ occupant override test2
Zone sensor w/ setpoint adjustment
Zone sensor w/ occupancy sensor This proc
Zone sensor
Zone sensor w/ occupant override
Zone sensor w/ setpoint adjustment test3
Zone sensor w/ occupancy sensor test4
Interface to BAS Networks Possible with interface hardware. The LGE/LGRM-E router connects the BACnet Primary Network to BACnet/IP on the Internet and/or on the building's IT network.
Compatible with the building's IT network? Yes
Protocol(s) BACnet over IP, BACnet over Ethernet
Cabling and Speeds N/A
Expansion Capability Each primary controller network can support up to 100 primary and secondary controllers with a maximum system capacity of 19,000 controllers.
Additional Information
Peer-to-Peer or Polling? Information not provided
Protocol(s) BACnet ARCnet (156 kbps)BACnet MS/TP (9600 bps - 76.8 kbps)
Cabling and Speeds Information not provided
Expansion Capability Information not provided
Additional Information Information not provided
Includes a listing of available Gateways, Routers and other devices that provide additional communications flexibility into and out of the BAS. Repeaters, bridges, standard modems and the like are typically not included here. Note: If in use by the BAS, the Internet/building IT Network is extremely open and non-proprietary. If a vendor uses the IT Network, CI devices such as IP routers and hubs can be purchased from third parties.
Model (Device) Application
Model (Device) LGE and LGRM-E
Application The 'LAN gate to Ethernet' (LGE) facilitates communication between the LAN controls and the Internet. LGRM-E is a rack-mount version of the LGE.
Classification Router
Primary Network (BACnet/ARCNET)
IT Network (BACnet over IP)
Additional Information
Model (Device) Application
Model (Device) ME-LGR/LGR
Application The LGR is a router/gateway that can connect hundreds of controls modules to a BACnet IP backbone. The ME-LGR has the additional capabilities of a multi-equipment controller
Classification Router/Gateway
BACnet over EIA485 (ARCNET@158 kbps or MS/TP@76.8 kbps max)
Additional Information