DDC Online direct digital controls
Computrols - CBAS  

System Architecture

Date Last Saved: 6/13/2013 5:03:15 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
Any PC that can support an Internet browser.
"Thin" Client Browser Netscape or Internet Explorer
"Thick" Client Browser N.A.
Product Application(s): N.A.
Handheld Interface Devices (HID)
PDA-Based N.A.
Proprietary (HHT) Hand Held Terminal used to view and change data on controllers through an EIA 232 port.
Local Display Panel (LDP) N.A.
Zone Based Interfaces (ZBI)
Thermostat with communication port to access local controller/network Information not provided
Other thermostat types available (without communication ports)
Interface to BAS Networks Ethernet/IP
Compatible with the building's IT network? Yes
Protocol(s) Ethernet/IP
Cabling and Speeds Standard Cabling @ 10 Mbps.
Expansion Capability Limited only by available static IP addresses.
Additional Information Requires static IP address. Controller contains its own onboard web server.
Peer-to-Peer or Polling? Polling
Protocol(s) EIA 485 serial port, CBAS
Cabling and Speeds Information not provided
Expansion Capability 2 Secondary controllers per 1 primary controller
Additional Information
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.