Computer/Embedded Technology


Plug-and-play switching hubs for building automation systems

21 April 2004 Computer/Embedded Technology

EIBA switches were specifically designed by Contemporary Controls to provide plug-and-play Ethernet connectivity for building automation systems (BAS) that have unique needs: convenient mounting, simple and dependable operation, low-voltage input power and especially low-cost. The company's EIBA-100T for panel mounting and the EIBA5-100T/R for DIN-rail mounting are claimed to meet these needs.

Although compact, BAS Switches are very capable devices. Using switching technology, they provide five 10/100 Mbps shielded RJ-45 ports. Each port supports the auto-negotiation protocol in order to select data rate, duplex and flow control. Both half- and full-duplex operation are supported as well as flow control. For half-duplex links, the Backpressure scheme is used. For full-duplex links, the Pause scheme is supported. All five ports are auto-MDI/X compliant and therefore any port can operate as an uplink port to another switch, eliminating the need for crossover cables in the field. All these features require no operator intervention, says the manufacturer, making the BAS Switches truly plug-and-play.

BAS Switches address one of the biggest issues in building automation systems and that is convenient mounting in control panels. Office-grade equipment is intended for desktop operation and requires a separate power supply that needs to be powered from an AC mains circuit. This usually requires a shelf to be constructed to mount the unit and a duplex receptacle to be installed inside the control panel. BAS Switches are intended for sub-panel mounting and can be powered from the same control transformer that is used to power the other BAS equipment, making the installation neat and rugged. They can also be powered from a low voltage, wide-range DC power source.

Unlike office-grade equipment, EIBA units are intended for commercial and industrial applications (UL 508 Listed for Industrial Control Equipment). They have a wider operating temperature range and comply with global industrial EMC standards.



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