Glossary
Term
|
Description
|
Shunt |
Electrical term for bypassing. In access control it is common to shunt an alarm sensor, such as a door position switch, when a door is about to be opened for valid access or egress. |
Single pole, double throw (SPDT) |
A term used to describe a switch or relay contact from (1form C), that has a normally open and a normally closed contact with a common connection. |
Single pole, single throw (SPST) |
A switch with one moving and one stationary contact, available either normally open (NO) or normal closed. |
Solenoid |
An electro-mechanical device that operates the lock bolt. When electricity is applied, a mechanical motion is obtained that moves the bolt. |
SP |
Service Pack - a collection of updates and fixes, called patches, for an operating system. Service packs also often include new features in addition to fixes. |
Spike |
A momentary increase in electric current Spikes can damage electronic equipment. |
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