XIA filter support needs to expand

[prjemian]

Usage at APS 6-ID-B includes three banks of the XIA filter box. The underlying support may also be different than the existing support. Need to check it.

See these EPICS database files:

• pf4bank.db
• pf4common.db

[prjemian]

[prjemian]

The existing support is for a dual PF4 configuration. All Components (2 banks and common) are defined in the class.

To improve modularity, might be useful to build a configuration from parts:

class Pf4FilterCommon(Device):
    transmission = Component(EpicsSignalRO, "trans", kind="hinted")
    inverse_transmission = Component(EpicsSignalRO, "invTrans", kind="normal")
    thickness_Al_mm = Component(EpicsSignalRO, "filterAl", kind="config")
    thickness_Ti_mm = Component(EpicsSignalRO, "filterTi", kind="config")
    thickness_glass_mm = Component(EpicsSignalRO, "filterGlass", kind="config")
    energy_keV_local = Component(EpicsSignal, "E:local", kind="config")
    energy_keV_mono = Component(EpicsSignal, "displayEnergy", kind="config")
    mode = Component(EpicsSignal, "useMono", string=True, kind="config")

class Pf4FilterBank(Device):
    fPos = FormattedComponent(EpicsSignal, "{prefix}fPos{_bank}", kind="config")
    bank = FormattedComponent(EpicsSignalRO, "{prefix}bank{_bank}", kind="config")
    bitFlag = FormattedComponent(EpicsSignalRO, "{prefix}bitFlag{_bank}", kind="config")
    transmission = FormattedComponent(EpicsSignalRO, "{prefix}trans{_bank}", kind="config")

    def __init__(self, prefix, bank=None, **kwargs):
        self._bank= bank
        super().__init__(prefix, **kwargs)

This would produce a device with a hierarchical structure, different than provided by the existing DualPf4FilterBox(). Don't change that support while supplying the new support. Here's an example:

class MyTriplePf4(Pf4FilterCommon):
    A = Component(Pf4FilterBank, "", bank="A")
    B = Component(Pf4FilterBank, "", bank="B")
    C = Component(Pf4FilterBank, "", bank="C")

triple_pf4 = MyTriplePf4(ioc_prefix, name="triple_pf4")
# triple_pf4.transmission     transmission through all filters
# triple_pf4.B.transmission     transmission through bank B filters

[prjemian]

Needs testing at APS