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The original protocol is called Channel Access and supports scalar and array PVs, while the newer protocol is called PVAccess (PVA), and supports structured data.

Each protocol has a gateway software package that runs both a client and a server.    Typically, the gateway is run on a host with multiple network adapters.   The server side listens for PV search requests from one network, and forwards them via it's client side to see if the PV exists on the other network.   If the PV is found, the gateway forwards the PV information through it's server side to the original client.    Gateways can also be configured to provide additional access security.

Recorded Overview of EPICS Gateways

A Recorded Zoom meeting of Bruce Hill describing various aspects of EPICS CA and PVA Gateway Software.  Click Here to view the recording.

Channel Access PV Gateway (ca-gateway)

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