Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Fri, 31 Mar 2000 17:15:25 +0900

Hi,

We are developing a new record called a beamLife record, which reads 
a value of stored current in the ring and its timestamp and calculate 
beam life time (or decay constant of stored beam current) in real-time.

I wrote prototype program using Python on WS and fixed its algorithm.
My colleague, Mr. Susumu Yoshida, converted it to a record support
routines for EPICS. In the Python program, I uses dbf_type_to_DBR_TIME
macro to get data with a time stamp in ca_get_array_callback call.
It gives us a value of beam current with the time of data taken.

In the record support routine for this beamLife record, I tried 
the dbGetLink function with DBR_TIME option. It is supposed return
the value of record and TIME_STAMP of it in a data structure. 
The data link we used in CA_LINK and we got incorrect TIME_STAMP data 
in the structure. Loooking at the code of dbGetLinkValue() function,
I found that the function just ignore the value of poption variable
passed by caller for CA_LINK type link.

Is there any good way to get the data and its TIME_STAMP 
in the record support routine through a CA_LINK?

Thanks in advance,

Noboru Yamamoto
KEKB control group
KEK, JAPAN

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System