Jeff Hill
64 lines
2.7 KiB
Plaintext
64 lines
2.7 KiB
Plaintext
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The files in this directory build an example CA server. This code
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is meant to provide some examples of how the CA server library can
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be used but is not intended to be an example of exemplary code organization
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and therefore care should be taken when emulating what is found here.
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The example server exports the process variables (PVs) in the table below.
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ScanPeriod Name HOPR LOPR Type Asynchronous Elements
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.1 "jane" 10.0 0.0 DBR_DOUBLE No 1
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2.0 "fred" 10.0 -10.0 DBR_DOUBLE No 1
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.1 "janet" 10.0 0.0 DBR_DOUBLE Yes 1
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2.0 "freddy"10.0 -10.0 DBR_DOUBLE Yes 1
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2.0 "alan" 10.0 -10.0 DBR_DOUBLE No 100
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20.0 "albert"10.0 -10.0 DBR_DOUBLE No 1000
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-1.0 "boot" 10.0 -10.0 DBR_ENUM No 1
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-1.0 "booty" 10.0 -10.0 DBR_ENUM Yes 1
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-1.0 "bill" 10.0 -10.0 DBR_DOUBLE No 1
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-1.0 "billy" 10.0 -10.0 DBR_DOUBLE Yes 1
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-1.0 "bloaty"10.0 -10.0 DBR_DOUBLE No 100000
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Many ca servers will find that synchronous variables will meet
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their needs and will not require the increased complexity
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associated with asynchronous PVs. Asynchronous PVs are needed
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when read and write IO requests cant be completed immediately.
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The PVs in the example server are updated periodically if the
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"ScanPeriod" column above contains a positive number. Some random
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"noise" is added to a PV's current value each time that it is
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updated.
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usage:
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excas [-d<debug level> -t<execution time> -p<PV name prefix>
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-c<numbered alias count> -s<1=scan on (default), 0=scan off>
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-ss<1=synchronous scan (default), 0=asynchronous scan>]
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-d<debug level>
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Increased diagnostics messages with increasing debug level. Defaults to no
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messages.
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-t<execution time>
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Specifies the duration that the server will run. Defaults to forever.
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-p<PV name prefix>
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Specifies the prefix applied to all PV names. If you specify "-pxxx:"
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then clients must specify PV names like "xxx:fred" or "xxx:jane".
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This is useful when several example servers are running on the same
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IP subnet for testing purposes. Defaults to no prefix.
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-c<numbered alias count>
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Useful when you need lots of aliased PV names. The alias names are
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of the form "fred1", "fred2", etc. Defaults to no aliases.
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-s<1=scan on (default), 0=scan off>
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Used to turn off updating of the PVs with random noise. Default is
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to update all PVs with a positive scan period.
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-ss<1=synchronous scan (default), 0=asynchronous scan>
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Controls updating of PVs from an asynchronous thread (tests thread
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safety of the server library). Defaults to synchronous.
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