How to configure waveform record to read remote PV via PVAccess in EPICS

[Varuna Crishan Meddage via Tech-talk <tech-talk at aps.anl.gov>]

I am trying to create a waveform record in my IOC that takes its values from a remote PV hosted on another serverusing EPICS PVAccess (PVA).

Here’s what I want to achieve:

• Define a waveform record locally (e.g., LOCAL:WF)
• Subscribe to a remote PV (e.g., REMOTE:ARRAY:PV) on a server with a known IP address and port
• Automatically update the waveform at a set scan rate

I am unsure about the exact configuration. Specifically, I would like guidance on:

1. Waveform record DB definition – how should the DTYP and INP fields be set to read from the remote PV?
2. Specifying the server IP and port in the INP field.
3. Specific DBD files and libraries that need to be included to achieve this goal.
4. Any pitfalls, such as array size (NELM) matching or data type requirements.

For example, would a record like this work?

=================================================

record(waveform, "LOCAL:WF") {

    field(DTYP, "pvaClientWaveform")

    field(INP, "PVA:REMOTE:ARRAY:PV@10.200.34.12:5075")

    field(SCAN, "1 second")

    field(NELM, "4096")

}

===============================================

I would greatly appreciate any example .db record, IOC DBD configuration, or startup instructions for properly using a remote PV with waveform records via PVA.

My base EPICS version is : epics-base-R7.0.9-328

Thanks

Varuna Meddage