The global event system Page: 1 of 15
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The Global Event System
John Winans FEB 1 4 1996
1.0 Overview O s T
The support for the global event system has been designed to allow an application devel-
oper to control the APS event generator and receiver boards. This is done by the use of
four new record types. These records are customized and are only supported by the device
support modules for the APS event generator and receiver boards.
The use of the global event system and its associated records should not be confused with
the vanilla EPICS events and the associated event records. They are very different.
2.0 The Event Generator
The Event Generator is used to generate global event codes and send them out to one or
more Event Receivers. A group of interconnected event generators and receivers is
referred to as an 'event circuit.' There may be more than one event generator on the same
event circuit. And it is possible for a single IOC to be part of multiple event circuits.
2.1 EG Records
The EG record type is used to select the options of a specific event generator card. In order
to properly configure it, you should first be familiar with its operating modes. This is spec-
ified in the document "Event System" by Frank Lenksus.
2.1.1 Field descriptions
OUT (Output Link) Specifies the link number of the event generator board. Only the
'Card' value of the link specification is used.
MOD1 (Mode Select for RAM 1) Used to select the operating mode of event sequence
RAM1. It is important to know that the configuration of the events in the RAM
may not be altered unless it is either 'Off' or in 'Alternate Mode'. Should a con-
figuration attempt be made when the RAM is not in one of these modes, it will be
deferred until the RAM mode is changed to either 'Off' or 'Alternate'. When
MOD1 is set to alternate from any other mode, MOD2 will also be set to alter-
nate. If MOD 1 is changed from alternate to any other mode, MOD2 will be set to
MOD2 (Mode Select for RAM 2) The same as MOD1 except it represents the mode for
The Global Event System March 2, 1994 1
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Winans, J. The global event system, report, March 2, 1994; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc672996/m1/1/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.