Setting Alarm Values on IN PVs

[jdmax]

I'm trying to perform a caput on alarm fields for PVs I created. For aOut PVs, this works as expected. For aIn PVs, they don't seem to change, and caputs return errors. I must be missing something. For instance, using the example code:

from softioc import softioc, builder, asyncio_dispatcher
import asyncio

dispatcher = asyncio_dispatcher.AsyncioDispatcher()

builder.SetDeviceName("Test")

ai = builder.aIn('AI', initial_value=5)
ao = builder.aOut('AO', initial_value=12.45, always_update=True,
                  on_update=lambda v: ai.set(v))

builder.LoadDatabase()
softioc.iocInit(dispatcher)

async def update():
    while True:
        ai.set(ai.get() + 1)
        await asyncio.sleep(1)

dispatcher(update)
softioc.interactive_ioc(globals())

If I use the interactive shell to do a dbpf on each PV, I see I can set the HIHI on the aOut, but not the aIn:

>>> softioc.dbgf('Test:AO.HIHI')
DBF_DOUBLE:         5         
>>> softioc.dbpf('Test:AO.HIHI','10')
DBF_DOUBLE:         10        
>>> softioc.dbgf('Test:AI.HIHI')
DBF_DOUBLE:         0         
>>> softioc.dbpf('Test:AI.HIHI','5')
DBF_DOUBLE:         0   

Thanks in advance for your help.

[Araneidae]

I think the issue is that for IN records caputs are deliberately disabled, because writing to the .VAL field of an IN record is a common mistake that simply doesn't work.

Fortunately there is an easy workaround. The disabling is simply done by setting the .DISP field to 1 ... and you can caput 0 to this field to turn off the disabling, do your caputs to the alarm fields, and then put .DISP back to 1 when you're done.

[jdmax]

That works. Thanks!