Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Wed, 14 Dec 2005 10:52:13 -0700

Hello Huang, Song;

> I use Channel Access Monitor function to monitor a PV (VAL field).
> When event triggered, it returns the value of VAL field, timestamp, alarm
> status and other things.
> But I also want to get the value of other fields (e.g. RVAL) when event
> triggered.
> In db_Access.h, it seems all types can't do this.
> 
> Do I have to get the value of other fields in Event Handler?

One possibility would be to set up a subscription using type DBR_TIME_XXXX
on channel "<record name>.<field>" expecting to receive the value of the
specified field along with the time stamp and the alarm status of the record
with each subscription update.

For example we can test this as follows:

> camonitor aiExample.RVAL
aiExample.RVAL        2005-12-14 10:42:25.992078 0 LOLO MAJOR
aiExample.RVAL        2005-12-14 10:43:23.994643 3 LOW MINOR
aiExample.RVAL        2005-12-14 10:43:24.994700 3
aiExample.RVAL        2005-12-14 10:44:04.996487 4
aiExample.RVAL        2005-12-14 10:44:05.996576 4 HIGH MINOR

All the best,

Jeff

> -----Original Message-----
> From: huangsong [mailto:[email protected]]
> Sent: Wednesday, December 14, 2005 1:46 AM
> To: [email protected]
> Subject: about CA monitor
> 
> Hello,
> 
> I use Channel Access Monitor function to monitor a PV (VAL field).
> When event triggered, it returns the value of VAL field, timestamp, alarm
> status and other things.
> But I also want to get the value of other fields (e.g. RVAL) when event
> triggered.
> In db_Access.h, it seems all types can't do this.
> 
> Do I have to get the value of other fields in Event Handler?
> 
> 
> Best wishes and regards.
> 
> ----------------
> Huang,song
> [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System