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| == '''V4 – Executive Summary''' ==
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| *Provide online add/delete of I/O to support continuous operation.
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| *Provide redundant control of remote I/O to support improved reliability.
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| *Provide name introspection and domain control in support of seamless *integration of large control systems
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| *Provide triggers, filters, and rate limits to improve resource use of network and client side processing
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| *Provide hierarchical devices to support higher level view of application in the front-end processors.
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| *Provide automatic backup and restore to support bump-less reboot and synchronization of redundant controllers.
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| *Provide atomic read, write, and write with read-back to multiple channels to support synchronized access of arbitrary sets of channels.
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| *Support international users with uni-code and time.
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| *Remove limitations on string lengths, device states, number of input links to support arbitrary sizes.
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| *Internationalize Time Stamps
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| == '''V4 – Structure and Array Support''' ==
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| *Allows definition and access to complex devices and multi-dimensional arrays
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| *Name hierarchy in Channel Access
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| **<arbitrary string>.structure. Element[n]
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| **e.g. Arc3PwrSupply.readback.status, ArcPwrSupply.readback.value
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| *Device description in database
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| *Support arbitrary number of inputs to calculations and subroutines.
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| *Support multi-state devices of an arbitrary number of states
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| == '''V4 – Data Acquisition Capabilities''' ==
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| *New subscription parameters
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| **Rate limit
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| **Value changes (as before but also % change)
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| **Triggers
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| **Filters
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| **Examples
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| **Send BPM at 1 Hz (where 1 Hz across IOCs is the same)
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| **Send BPM when trigger specifies that this pulse is e-
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| **Send RF reading when filter says that vacuum is higher than 10e-6 torr
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| *Allows more accurate requests for data on client applications
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| *Reduces the amount of network and client CPU usage
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| *Specify priority for circuit - QOS
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| == '''V4 – Device Read/Write Operations''' ==
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| *Allows multiple fields to be read/written as an atomic operation
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| *Reads/Writes can be triggered
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| **e.g. Put( Corr1.K, Corr2.K, Corr3.K, on trigger event)
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| **All puts take place when the trigger event occurs
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| *Write with return data support (Command/Response)
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| *Ramping/arb function outputs – given two end points
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| == '''V4 – Name Resolution Extensions''' ==
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| *Allow wildcard searches
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| *Allow request to send all names supported in the IOC
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| *Support redundancy by allowing connections to specify that they are not active
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| *Support multiple name servers by allowing connections to specify how close to the source they are.
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| *Name aliasing supported.
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| == '''V4 – Online Add / Delete''' ==
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| *Support hardware address change during operation
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| *Allow new record instances to be loaded at any time
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| *Support addition of hardware of an already supported type (64x)
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| *Support addition of new hardware during operation.
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| *Remove records during operation.
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| == '''V4 – Redundancy: Multiple masters of remote I/O''' ==
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| *Support name responses from multiple controllers of the same database.
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| *Support request for all fields from a primary database to its backup.
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| *Support a request for all fields that have changed since the last synchronization of the backup to the primary.
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| *Support a mechanism for switching from the primary to the backup.
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| *Provide a mechanism for synchronizing primary and the backup.
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| *Support multiple communication paths that provide
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| **an isolated network for synchronization traffic
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| **redundant checks to synchronize switch over behavior.
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| *Provide a mechanism to start/stop scanning
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| *Provide a mechanism to start/stop sequences
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| *Provide a mechanism to start/stop drivers from scanning
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| == '''V4 – Support Large / Multi-segmented Control System''' ==
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| *Support load balancing between multiple data sources (1st order gateway, 2nd order gateway, IOC, and load).
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| *Support domain control independent of network topology
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| **Beamline data is not available to the control room
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| **Only insertion gap and beam quality information is available to the beamline controls from the ring control room.
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| =='''V4 – Extendable Metadata / Properties''' ==
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| *Metadata can be extendable –
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| **Add array dimensions
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| **Add time base to an array
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| **Application programmers can add metadata
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| *Specify metadata by field rather than record
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| **Only get metadata when it is meaningful
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| **No display limits for the high display limit
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| *Calc and subroutine records have arrays of inputs
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| **No limit to the number of variables
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| =='''V4 – Channel Access Diagnostics'''==
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| *Server Diagnostics
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| **Connections
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| **Channels
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| **Events per second
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| **State of Health
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| **Beacon Periodicity
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| **Etc…
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| *Client Diagnostics
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| **Number of connections/server per client
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| **Number of channels
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| **Events per second
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| **State of connection
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| **Etc…..
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| =='''V4 – Limitations Remediation'''==
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| *Multi-line text
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| *Variable length strings
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| **Removes current limitations of 40 characters
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| **Reduces size of memory use in most cases
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| **Reduces network traffic in most cases
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| *Unicode
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| **Support alternate character sets
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| *Multidimensional arrays
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| *Variable size arrays
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| =='''V4 – Time Stamp Internationalization'''==
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| *Support ISO 8601 Format
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| **Year-month-date-hours-minutes-seconds-fractional seconds
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| **Country specific time stamps
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| *Support Locale Settings for conversions
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| **,02 as 2 hundreds of a second
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| =='''V???? – Resource Consumption Quotas'''==
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| *User specific CA client resource consumption quotas in access security system
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