Experimental Physics and
Industrial Control System

Jeff Hill <[email protected]> · Tue, 02 Apr 1996 11:03:55 -0700

Peregrine McGehee wrote:
> 
> At the last collaboration meeting (during ICALEPCS) there was a
> lengthly discussion during Jeff's talk on the "Portable CA Server
> status" that dealt with the relationship between CA, PCAS, and cdev.
> 
> I recall a statement being made that the functionality of the CA
> client API may be reduced in future releases (4.0+?) under the
> assumption that most client applications will be using a cdev layer to
> reach CA.

We intend to maintain backwards compatibility with the existing
CA client API. Funding permitting, we will also produce a next
generation CA client API/CA protocol with an emphasis on improved
performance, efficiency, and ease of use. 

 > 2) if you need to transport complex data types, or perform any kind
 >    of transaction processing, and don't need EPICS applications, use cdev.
 >    This is available now, and it is not too hard even to implement a
 >    custom server starting from Walt's skeleton.

The PCAS API supports begin/end transaction and complex data types.
Full access to these capabilities from the CA client API will
of course require revisions to the CA protocol/CA client API.

Jeff

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System