User Tools

Site Tools


glossary:glossary_e

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
glossary:glossary_e [2019/02/01 19:17]
WortingUK [Engine Driver]
glossary:glossary_e [2019/04/08 09:42]
Bob Vetterlein [EV]
Line 31: Line 31:
 [[https://​en.wikipedia.org/​wiki/​Equivalent_series_resistance|Equivalent Series Resistance]] [[https://​en.wikipedia.org/​wiki/​Equivalent_series_resistance|Equivalent Series Resistance]]
  
 +=====EV=====
 +__E__vent __V__ariable a [[glossary:​glossary_c#​cbus|CBUS]] term referring to a value which controls the action to be taken by a '​consumer'​ module when a specific event is received. One or more EVs are associated with each event that a module should respond to. As an example in the CANACC8 there are two EVs per event, in the first a set (1) bit indicates that the associated output is affected and normally follows the '​state'​ of the event. The second EV is a modifier and any set (1) bit that matches EV1 will invert the action for that output. So if the two EVs for a given event were 00000011 & 00000010 then on receipt of that event output 1 would assume the '​state'​ defined by the event while output 2 would assume the inverse.
  
 +=====Event=====
 +A [[glossary:​glossary_c#​cbus|CBUS]] term for a message that indicates some outside action has taken place such as the press of a button, change in state of a switch, a train has entered or left a particular section of track, a point actuator has completed its commanded move or any number of other things. These messages consist of three or four parts. First, the OPCODE a single byte which defines the meaning and length of the message. Second & third constitute the '​Event'​ two bytes designating the source module ID and two bytes designating the '​device'​ within that module that has caused the event. Fourth (optional) from 1 to 3 additional data bytes used to convey other information.
 +====Long Event====
 +An event that uses both the module ID and the device ID and so constitutes a unique event within the system.
 +====Short Event====
 +An event where the module ID is ignored and only the device ID is relevant, thus the event is not unique and may seemingly be produced from two or more sources.
glossary/glossary_e.txt ยท Last modified: 2019/04/08 09:42 by Bob Vetterlein