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Appendix B: Glossary
Address
An identifying number assigned to each panel in a network. The master panel always receives the address “0”. Slaves
are numbered from “1” to a maximum value of “15”. During network operation, the Master panel polls the Slaves in
ascending numerical order.
Alarm
A shutoff signal generated by an interlock device wired to an ORS Sitepro™ panel.
Alarm Channel
One of four circuits in the ORS Sitepro™ that can carry an alarm signal. Alarms are carried from panel to panel on the
Interlock Communication Bus.
A/D Converter
A device that converts analog signals to digital signals.
Analog Input
An input that accepts signals from pressure transducers or other analog devices. Analog signals are continuous functions
and must be converted to discrete digital data before they can be manipulated by the microprocessor. This conversion is
carried out by the ORS Sitepro™’s analog to digital (A/D) converter.
Baud Rate
Rate of data transfer in bits/second. A measure of how fast information is transferred over a serial communications
network.
Dry Contact
An electrical switch that is isolated from any source of electrical energy. In the diagram below, the dry contacts are acted
upon by a relay coil that is isolated from the switch.
Form C Contacts
A set of electrical contacts that has both Normally Open and Normally Closed poles as shown in the diagram below. See
definitions of Normally Open and Normally Closed also included in this Glossary.
Interlock Communication Bus
An RS-485 network that allows the ORS SITEPRO™ to exchange information with other panels.
Interlock
A signal or alarm generated by a switching device attached to an ORS SITEPRO™ panel.
Intrinsically Safe
Incapable of carrying enough electrical current to cause an explosion.
IP 66
Enclosure intended for outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing
water, and hose-directed water; undamaged by the formation of ice on the enclosure. The international Electro-technical
Commission (IEC) equivalent to a rating of NEMA 4.
Summary of Contents for ORS SITEPRO 2000
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